Ferrous Metal Patents (Class 205/735)
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Patent number: 11299385Abstract: A multiple-piece vacuum-insulated heating tank for use in a water dispenser includes a threaded cover, a thermal insulation cover, and a heating tank body. The threaded cover is mounted on an upper opening of the heating tank body and includes a plastic cover and a protective cover mounted on and around the plastic cover. The thermal insulation cover is fitted in the upper opening and includes an upper cover and a lower cover. The lower cover is cup-shaped; is mounted with a heating tube, a water inlet pipe, a water outlet pipe, a thermowell, a temperature-sensing heat pipe, a heat collector block, and two snap-action thermostats at the bottom side; and has a sidewall formed with a step adjacent to the bottom side. The heating tank not only has a multiple-piece structure that facilitates mass production and maintenance, but also dispenses with electronic temperature control as is conventionally required.Type: GrantFiled: July 28, 2020Date of Patent: April 12, 2022Assignee: SUZHOU OASIS ELECTRONIC CO., LTD.Inventor: Yu-Chun Shen
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Patent number: 9796903Abstract: Corrosion-resistant refractory binder compositions may be formed with a calcium ion source, high-alumina refractory aluminosilicate pozzolan, and water. Any one or more of such components may individually be non-cementitious. Examples of high-alumina refractory aluminosilicate pozzolan include crushed firebrick; firebrick grog; and mixtures of silicate and any one or more of corundum, high-alumina ceramic, and bauxite; refractory mortar; fire clay; mullite; fused mullite; and combinations thereof, among others. A binder composition may be mixed with sufficient amount of water to form a slurry, which slurry may be introduced into a subterranean formation (e.g., via a wellbore penetrating the subterranean formation). A plurality of the non-cementitious components may react in the presence of water when exposed to suitable conditions so as to enable the binder composition to set. Such compositions, once set, may exhibit enhanced corrosion and/or heat resistance as compared to other binder compositions.Type: GrantFiled: December 20, 2013Date of Patent: October 24, 2017Assignee: Halliburton Energy Services, Inc.Inventors: Kyris Agapiou, Ben Iverson
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Patent number: 9738551Abstract: This invention relates to compositions and methods for the at least partial dissolution, disruption and/or removal of deposits, such as scale and other deposits, from heat exchanger components. The heat exchanger components can include pressurized water reactor steam generators. The pressurized water reactor steam generators can be in a wet layup condition. The compositions include elemental metal and complexing agent selected from the group consisting of sequestering agent, chelating agent, dispersant, and mixtures thereof. The methods include introducing the compositions into the heat exchanger components.Type: GrantFiled: April 18, 2012Date of Patent: August 22, 2017Assignee: Westinghouse Electric Company LLCInventors: Kurtis R. Crytzer, Lauren R. Weichel
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Patent number: 9683296Abstract: Galvanic anodes and barrier corrosion control for metal pipelines, tanks, and equipment under thermal insulation includes the use of pure aluminum and aluminum alloys in fresh water at high temperatures to protect steel elements in hot water without sufficient chlorides. Sacrificial aluminum and sacrificial zinc-aluminum powders in a mixed primer provide long-term, effective corrosion control of steel under thermal insulation can be achieved in all water temperature ranges regardless of the presence of sufficient chlorides. At temperatures below 75° C., the zinc particles in the primer act to protect the substrate steel. At temperatures above 75° C., the aluminum particles in the primer, and galvanic aluminum tape protect the substrate steel in chloride free neutral pH water and also reduce the consumption of zinc particles in the primer. When the electrolyte water for CUI is sufficiently contaminated with chlorides, the aluminum particles in the primer and the galvanic aluminum become active.Type: GrantFiled: March 7, 2013Date of Patent: June 20, 2017Inventor: Miki Funahashi
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Publication number: 20150096900Abstract: Disclosed is an alloy of the formula: Fe3?xAl1+xMyTzTat wherein M represents at least one catalytic specie selected from the group consisting of Ru, Ir, Pd, Pt, Rh, Os, Re and Ag; T represents at least one element selected from the group consisting of Mo, Co, Cr, V, Cu, Zn, Nb, W, Zr, Y, Mn, Cd, Si, B, C, O, N, P, F, S, CI, Na and Ti; and Ta represents tantalum. Such an alloy can be used as an electrode material for the synthesis of sodium chlorate. It can also be used as a coating for protection against corrosion.Type: ApplicationFiled: April 26, 2013Publication date: April 9, 2015Inventors: Robert Schulz, Sylvio Savoie
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Patent number: 8961746Abstract: Cathodic protection of steel in concrete is provided by locating an anode assembly including both a sacrificial anode and an impressed current anode in contact with the concrete and providing an impressed current from a power supply to the anode. The impressed current anode forms a perforated sleeve surrounding a rod of the sacrificial anode material with an activated ionically-conductive filler material between. The system can be used without the power supply in sacrificial mode or when the power supply is connected, the impressed current anode can be powered to provide an impressed current system and/or to recharge the sacrificial anode from sacrificial anode corrosion products.Type: GrantFiled: July 19, 2012Date of Patent: February 24, 2015Assignee: Vector Corrosion Technologies Ltd.Inventors: George Sergi, Attanayake Mudiyanselage Gamini Seneviratne, David Whitmore
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Patent number: 8821698Abstract: A multi purpose segmented Titanium Mixed Metal Oxide coated impressed current cathodic protection anode assembly (Ti MMO anode assembly). The Ti MMO anode assembly includes combinations selected from four anode components and four connection components. The various components may be assembled for different applications in liquid or soil environments for the prevention or reduction of corrosion and loss of structural integrity. For example, the Ti MMO anode assembly may be applied to protect pipelines, buried structures, piers and internal surface protection of tanks and vessels in different arrangements such as deep wells, shallow ground beds, or distributed individual anodes.Type: GrantFiled: July 27, 2011Date of Patent: September 2, 2014Inventor: Omidreza Moghbeli
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Patent number: 8636877Abstract: A sacrificial anode system and associated surface pipe system maintenance method designed to protect surface pipes and associated parts. According to a first aspect of the present invention, the sacrificial anode system is installable at an interface between a first pipe and a second pipe and comprises an insertion sleeve shaped to fit along an inner surface of the first pipe, a flange attached to the insertion sleeve and shaped to rest against an end surface of the first pipe, a sacrificial anode to be positioned within the first pipe, and a stem linking the sacrificial anode to the insertion sleeve. According to a second aspect of the present invention, a method for maintaining a surface pipe system is also provided.Type: GrantFiled: February 10, 2011Date of Patent: January 28, 2014Inventor: Joseph Palmer
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Patent number: 8562812Abstract: The invention relates to a superficial treatment method by electrolysis of ferrous surfaces to enhance friction or tread and seizing resistance features, wherein the surfaces provide the electrolysis anode, the electrolysis bath includes a sulphur species, primarily contains water and also contains a chloride salt and a nitrogen species in quantities which facilitates the sulphuration reaction of the surfaces.Type: GrantFiled: November 16, 2007Date of Patent: October 22, 2013Assignee: H.E.F.Inventors: Philippe Maurin-Perrier, Herve Chavanne, Smail Aaziz
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Patent number: 8168059Abstract: A method for inhibiting corrosion in at least one required region of an elongate metal structure, comprising applying a high-frequency electromagnetic signal to the structure in a manner such that a voltage standing wave is established in the structure with a corrosion-inhibiting potential at the required region(s) of the structure. The method is advantageously applied to an oil well riser pipe, to inhibit corrosion of the external surface thereof in the vicinity of an oil production zone.Type: GrantFiled: February 29, 2008Date of Patent: May 1, 2012Assignee: Hydropath Holdings LimitedInventor: Daniel Stefanini
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Patent number: 8048288Abstract: Techniques are generally described herein for protecting food or beverage containers (e.g., cans) using impressed current protection. In various embodiments, containers may be received into at least one conductive bed, each bed having a complementary anode. The containers may then be electrically coupled to a first terminal (e.g., negative) of a power supply, and the anode may be electrically coupled to a second terminal (e.g., positive) of the power supply. Resultantly, protective current may be provided to the containers by the anode. Other embodiments may be disclosed and claimed.Type: GrantFiled: November 25, 2009Date of Patent: November 1, 2011Assignee: Empire Technology Development LLCInventor: Angele Sjong
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Patent number: 7951286Abstract: A method is disclosed for using an impressed current cathodic protection (ICCP) system that supplies an electrical current such that a metallic structure (10) has a negative voltage of between 0.5 and 1.5 Volt relative to earth to power one or more electrical appliances (5), the method comprising: —providing one or more electrical appliances (5) which each have a pair of electrical contacts (1,2); —connecting one electrical contact (1) of each electrical appliance to the structure; and —connecting the other electrical contact (2) of each electrical appliance to earth, thereby providing electrical power to each of the electrical appliances. It is preferred that the electrical appliances (5) are equipped with one or more DC-DC power converters (6) which are configured to enhance an electrical input voltage of between 0.5 and 1.5 Volt to an electrical output voltage of between 3 and 5 Volt.Type: GrantFiled: April 20, 2007Date of Patent: May 31, 2011Assignee: Shell Oil CompanyInventors: Sicco Dwars, Christopher Ozemoya Ubuane
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Publication number: 20110120884Abstract: Techniques are generally described herein for protecting food or beverage containers (e.g., cans) using impressed current protection. In various embodiments, containers may be received into at least one conductive bed, each bed having a complementary anode. The containers may then be electrically coupled to a first terminal (e.g., negative) of a power supply, and the anode may be electrically coupled to a second terminal (e.g., positive) of the power supply. Resultantly, protective current may be provided to the containers by the anode.Type: ApplicationFiled: November 25, 2009Publication date: May 26, 2011Applicants: Empire Technology Development LLC, Glitter Technology LLPInventor: Angele Sjong
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Patent number: 7897031Abstract: An apparatus, system, method and computer program product directed to controlling corrosion, particularly space weather induced corrosion, of a conductive structure in contact with a corrosive environment and coated with a semiconductive coating, where the corrosion is controlled by a controllable filter and a corresponding electronic control unit configured to process and adjust the controllable filter in response to at least one measured parameter associated with space weather effects on the conductive structure.Type: GrantFiled: November 18, 2008Date of Patent: March 1, 2011Assignee: Applied Semiconductor International Ltd.Inventors: David B. Dowling, Farshad Khorrami, Joseph G. Michels, Mikhail Panasyuk
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Publication number: 20110031132Abstract: The invention relates to a hydraulic binder, comprising K, Ca, aluminosilicates, as well as optionally Li, Na, and Mg, wherein the binder comprises the following components: a) a latently hydraulic aluminosilicate glass with a ratio of (CaO+MgO+Al2O3)/SiO2>1 and b) an alkali activator of the empirical formula (I) a(M2O)*x(SiO2)*y(H2O)??(I) wherein M=Li, Na, K, a=0-4, and x=0-5 and y=3-20, wherein the molar ratio of Ca/Si is <1, the molar ratio of Al/Si is <1, and the molar ratio of M/Si is >0.1. Furthermore, it relates to binder matrices, mortars, concrete adhesives, and metal anodes made of such binder.Type: ApplicationFiled: July 29, 2010Publication date: February 10, 2011Inventor: Wolfgang SCHWARZ
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Patent number: 7422789Abstract: A cathodic protection polymeric compound is disclosed. The compound has flowable material to serve as a binder, carbonaceous conductive media dispersed in the flowable material, sacrificial metal particles also dispersed in the flowable material. The carbonaceous conductive media serve as a carbon-based electron transfer agent and are in the form of particles, platelets, fibers, tubes, or combinations thereof. A galvanic circuit is formed by the metal particles serving as anodes, a metal substrate to be protected serving as the cathode, and the conductive media serving as the electron transfer agent. The flowable material can also include an ionically conductive or an inherently conductive polymer to further enhance the galvanic circuit.Type: GrantFiled: October 22, 2004Date of Patent: September 9, 2008Assignee: Polyone CorporationInventors: Roger W. Avakian, Stephen D. Horton, John H. Hornickel
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Patent number: 7332069Abstract: The present invention provides a curable cathodic corrosion protection powder coating, which comprises a thermosetting resin, a zinc borate compound, a curing agent in an amount effective to cure the coating. Further, the present invention also provides a method of cathode corrosion protection which includes the steps of subjecting the substrate to a mechanical treatment, applying to said treated steel surface, the cathodic protective coating, and polarizing the coated material as a cathode.Type: GrantFiled: January 23, 2007Date of Patent: February 19, 2008Assignee: E.I. du Pont de Nemours & Co.Inventor: Stephen J. Edmondson
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Patent number: 7318889Abstract: An apparatus, system, method and computer program product directed to controlling corrosion of a conductive structure in contact with a corrosive environment and electrically connected to one or more anodes, wherein the anodes are less noble than the conductive structure, where the corrosion is controlled by a controllable filter and a corresponding electronic control unit configured to process at least one stored or measured parameter, and wherein the apparatus, system and method serve to prolong the lifetime of the one or more anodes by reducing, minimizing or substantially eliminating their sacrificial character.Type: GrantFiled: June 2, 2005Date of Patent: January 15, 2008Assignee: Applied Semiconductor International, Ltd.Inventor: David B. Dowling
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Patent number: 7279087Abstract: A method for protecting metal-containing structures, in particular electrically conductive structures, deposited on a substrate, against corrosive attacks, in particular electrocorrosion attacks. The method applies at least temporarily to the structure a passivation electric voltage in the passivation range of the conductive material concerned.Type: GrantFiled: January 7, 2004Date of Patent: October 9, 2007Assignee: Saint-Gobain Glass FranceInventor: Helmut Maeuser
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Patent number: 7186327Abstract: A method and apparatus wherein an electrically conductive element is placed inside a previously installed metallic water vessel such as a supply pipe or well. A direct current voltage is then applied between the element and the conductive wall of the vessel. The conductive element can be a partially insulated wire. For causing deposition on the vessel, the voltage applied to the conductive element is of an amount sufficient to cause the potential of the metallic vessel to be lowered below the potential of the element by at least ?0.3 volts, and more adequately ?1.3 volts. An alternative embodiment involves reversing the polarity of the voltage applied between the conductive element and the vessel, causing the oxidation/reduction reaction to reverse, resulting in calcium carbonate being removed from the vessel by the production of acid at the surface of the vessel.Type: GrantFiled: July 18, 2002Date of Patent: March 6, 2007Inventor: Larry L. Russell
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Patent number: 7182852Abstract: The present invention provides a method of testing a cryogenic metal tank before it is put into service, in which said method said tank (1) is filled with water and appropriate measurements are performed where necessary, the method being characterized in that the following steps are performed: filling said metal cryogenic tank (1) with sea water; and providing the bottom and side metal walls (2, 3) of said tank (1) that are constituted essentially by bare steel, with temporary cathodic protection by injecting an electric current into anodes disposed within said tank (1) once said anodes become immersed. Advantageously, a first anode array (51) is placed in the immediate vicinity of the bottom of the tank using support means (52), said support means (52) and said first anode(s) (51) preferably being removable.Type: GrantFiled: October 10, 2003Date of Patent: February 27, 2007Assignee: Saipem S.A.Inventor: Alphonse Boreave
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Patent number: 7147768Abstract: A process of reducing scaling of a metal surface exposed to an aqueous solution from which scale may form after a period of exposure. The process comprises applying a cathodic potential to the surface for at least some of the period of exposure. In some cases, e.g. when an article is made of a ferrous metal, it is advantageous to coat the article with a different metal (e.g. copper or an alloy of copper) before applying the cathodic potential to avoid hydrogen generation and excessive current flow. An article to be protected from scaling may also advantageously be electrically isolated from other parts of an apparatus.Type: GrantFiled: August 15, 2002Date of Patent: December 12, 2006Assignee: Alcan International LimitedInventor: Raymond Breault
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Patent number: 6902661Abstract: A system using tank corrosion sensors to provide for an overall assessment and monitoring of the electro-chemical corrosion and coatings condition in ships' tanks, and particularly in ships' seawater or compensated fuel tanks. The system includes reference half-cells mounted along a suspended cable and one instrumented sacrificial anode at the end of the cable to provide optimal sensing capability within a tank structure. The reference half-cells and the sacrificial anode measure a potential and current output, respectively. Together the measurements provide objective information that can be used to predict corrosion damage and coating deterioration occurring throughout the structure of the tank. The system may be used for an overall assessment and monitoring of the electrochemical corrosion and coatings condition. In a preferred embodiment, the measurements are stored in a datalogger that is optimally contained within an associated instrument housing.Type: GrantFiled: July 6, 2004Date of Patent: June 7, 2005Assignee: The United States of America as represented by the Secretary of the NavyInventors: Elvin D. Thomas, III, Keith E. Lucas, Paul Slebodnick, Elizabeth A. Hogan
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Patent number: 6890420Abstract: A semiconductor system is provided that uses semiconductive organic polymers, electronics and semiconductor technology to provide a wide array of semiconductor components and a system of preventing corrosion of a surface of a metal structure in contact with a corrosive environment involving: (a) a semiconductive organic polymer coating in conductive contact with at least part of the surface; and (b) an electronic filter for filtering corrosive noise and a method of preventing corrosion using the system.Type: GrantFiled: March 28, 2003Date of Patent: May 10, 2005Assignee: Applied Semiconductor, Inc.Inventor: David B. Dowling
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Patent number: 6811681Abstract: An apparatus, system, method and computer program product directed to controlling corrosion of a conductive structure in contact with a corrosive environment and coated with a semiconductive coating, where the corrosion is controlled by a controllable filter and a corresponding electronic control unit configured to process at least one stored or measured parameter.Type: GrantFiled: November 12, 2002Date of Patent: November 2, 2004Assignee: Applied Semiconductor International Ltd.Inventors: David B. Dowling, Farshad Khorrami
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Publication number: 20040134795Abstract: This invention pertains to the protection of metals from corrosion and/or fouling from exposure to environments such as, for example, seawater. The protection in accordance with this invention is achieved through the use of conductive zinc-containing coatings in combination with applied current cathodic protection.Type: ApplicationFiled: July 23, 2003Publication date: July 15, 2004Inventors: Daniel R. Demarco, Basil V. Gregorovich, Robert C. Nahas, Shi Hua Zhang
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Publication number: 20040118702Abstract: Cathodic protection of an existing concrete structure, including a steel member at least partly buried, such as steel rebar, in the concrete structure, is provided by embedding anodes into a fresh concrete layer applied over an excavated patch and/or as a covering overlay. The anodes are embedded at spaced positions or as an array in the layer and connected to the rebar. A corrosion inhibitor is added into the fresh concrete at least at the interface and more preferably in admixture with the fresh concrete which acts to reduce the flow of ionic current to the steel or between the anode member and the steel in the fresh covering material without significantly increasing the resistivity of the fresh covering material and without inhibiting the ionic current between the anode member and the fresh covering material. In this way the current to the steel in the existing concrete is maximized to maximize the cathodic protection to the existing steel which is the primary target.Type: ApplicationFiled: December 20, 2002Publication date: June 24, 2004Inventor: David Whitmore
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Publication number: 20040112762Abstract: The present invention relates to a method for protecting surfaces (S) which are in contact or come into contact with a water-containing medium (M) against biological macro-fouling, wherein 1) S is electrically conducting and 2) such a potential (P) fluctuating over time is applied to S that it inhibits the growth of organisms that live in M and/or propagate therein and which have the tendency to form deposits on S, characterised in that P does not assume values that are higher than the corrosion potential of S in M and the average value of P is lower than the said corrosion potential.Type: ApplicationFiled: February 5, 2004Publication date: June 17, 2004Inventors: Marc Erwin Wilms, Hendrik Jacobus Arie Breur
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Patent number: 6562206Abstract: A propeller attachment is disclosed including a body, the body including an anodic material, at least one projection projecting from the body, and a fastener coupled to the body. An anode is also disclosed including an annular body constructed from an anodic material, a fastener disposed centrally in the annular body, and at least one extension coupled to the annular body, the at least one extension is configured to allow for gripping of the anode. A fastener for coupling a propeller to a drive shaft of a lower unit is disclosed including a fastening portion configured to threadably engage the drive shaft and retain the propeller. The fastener further includes an anodic portion disposed around the fastening portion. The anodic portion is shaped to form at least one grip, and the anodic portion preferentially corrodes to prevent corrosion of the lower unit.Type: GrantFiled: May 31, 2001Date of Patent: May 13, 2003Assignee: Johnson Outdoors Inc.Inventor: Shawn Showcatally
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Patent number: 6551491Abstract: A system for preventing corrosion of a surface of a metal structure in contact with a corrosive environment comprising: (a) a semiconductive coating in conductive contact with at least part of the surface; and (b) an electronic filter for filtering corrosive noise and a method of preventing corrosion using the system.Type: GrantFiled: November 9, 2001Date of Patent: April 22, 2003Assignee: Applied Semiconductor, Inc.Inventors: David Dowling, Art Spivack
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Patent number: 6524466Abstract: A system for preventing corrosion and/or fouling of a surface of a biomedical device in contact with a corrosive environment comprising: (a) a semiconductive coating in conductive contact with at least part of the surface; and (b) an electronic filter for filtering corrosive noise and a method of preventing corrosion and/or fouling using the system.Type: GrantFiled: July 18, 2000Date of Patent: February 25, 2003Assignee: Applied Semiconductor, Inc.Inventors: Joseph Bonaventura, Louis Ignarro, David B. Dowling, Arthur J. Spivack
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Publication number: 20020195353Abstract: A semiconductor system is provided that uses semiconductive organic polymers, electronics and semiconductor technology to provide a wide array of semiconductor components and a system of preventing corrosion of a surface of a metal structure in contact with a corrosive environment involving:Type: ApplicationFiled: June 25, 2001Publication date: December 26, 2002Applicant: APPLIED SEMICONDUCTOR, INC.Inventor: David B. Dowling
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Patent number: 6425997Abstract: A process for removing chloride ions from steel surfaces and measuring the amount present on the steel surface being tested employs a high frequency waveform alternating current treatment as a pre-measurement step to liberate the chloride ions into deionized water on the steel surface being tested. The conductivity of the water containing the chloride ions is measured in a conductivity cell mounted on the same steel surface being tested. Recovery of chloride ions originally present on the steel test surface (cathode) is 85-95% complete when a sine wave high frequency alternating current is used between the steel test surface (cathode) sealed below an insulating plastic box containing the deionized water and which plastic box contains a steel plate (anode) mounted within and immediately below the inside top of the plastic box conductivity cell. The conductivity of the water in the cell is measured by a conductivity meter after disconnecting the high frequency waveform alternating current.Type: GrantFiled: June 20, 2000Date of Patent: July 30, 2002Inventor: William C. Johnson
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Publication number: 20020092778Abstract: This invention relates to a process for the derusting or removal of corrosion products form ferrous metal substrates by electrochemical treatment.Type: ApplicationFiled: November 29, 2000Publication date: July 18, 2002Applicant: COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCHInventors: Nerur Sankaranayan Rengaswamy, Sironmani Palraj, Gopalan Subramanian, Thirupathisaram Muthukrishna Balasubramanian
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Patent number: 6402933Abstract: A system for preventing corrosion of a surface of a metal structure in contact with a corrosive environment comprising: (a) a semiconductive organic polymer coating in conductive contact with at least part of the surface; and (b) an electronic filter for filtering corrosive noise and a method of preventing corrosion using the system.Type: GrantFiled: June 8, 2001Date of Patent: June 11, 2002Assignee: Applied Semiconductor, Inc.Inventor: David B. Dowling
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Publication number: 20020046956Abstract: A system for preventing corrosion of a surface of a metal structure in contact with a corrosive environment comprising:Type: ApplicationFiled: November 9, 2001Publication date: April 25, 2002Applicant: APPLIED SEMICONDUCTOR, INC.Inventors: David Dowling, Art Spivack
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Patent number: 6331242Abstract: Corrosible metallic elements of tank are protected by an anodic encasement sleeve. The anodic encasement sleeve employs an inner sacrificial anodic layer and an outer environmental barrier layer to provide both cathodic and barrier protection against corrosion. Following application of the sleeve, typically by drawing or wrapping, the anodic encasement sleeve remains substantially unbonded from the tank, though it is electrically connected by conductive means. Because of the substantially unbonded relationship between the sacrificial anodic layer and the metallic elements of the tank, if electrolyte is present under the environmental barrier (due to breaches, installation error, condensation, etc.), the electrolyte may enter the unbonded area between the tank and the anodic material. This increases the ratio of anodic material to tank available, which makes the cathodic protection more efficient and effective for an extended duration.Type: GrantFiled: June 21, 2000Date of Patent: December 18, 2001Assignee: United States Pipe and Foundry Company, Inc.Inventor: A. Michael Horton
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Patent number: 6325915Abstract: A system for preventing corrosion of a surface of a metal structure in contact with a corrosive environment comprising: (a) a semiconductive coating in conductive contact with at least part of the surface; and (b) an electronic filter for filtering corrosive noise and a method of preventing corrosion using the system.Type: GrantFiled: June 2, 2000Date of Patent: December 4, 2001Assignee: Applied Semiconductor, Inc.Inventors: David Dowling, Art Spivack
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Patent number: 6303017Abstract: Reinforcement in concrete is cathodically protected by galvanically connecting a sacrificial anode, such as a zinc or zinc alloy anode, to the reinforcement, and contacting the anode with an electrolyte solution having a pH which is maintained sufficiently high for corrosion of the anode to occur, and for passive film formation on the anode to be avoided. The pH of the electrolyte is preferably at least 0.2 units, and preferably from 0.5 units to more than 1.0 units, above the pH value at which passivity of the anode would occur. The electrolyte may be for example sodium hydroxide or potassium hydroxide but is preferably lithium hydroxide which also acts as an alkali-silica reaction inhibitor.Type: GrantFiled: August 20, 1999Date of Patent: October 16, 2001Assignee: Aston Material Services LimitedInventors: Christopher L. Page, George Sergi
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Patent number: 6214203Abstract: Corrosible metallic elements of pipe are protected by an anodic encasement sleeve. The anodic encasement sleeve employs an inner sacrificial anodic layer and an outer environmental barrier layer to provide both cathodic and barrier protection against corrosion. Following application of the sleeve, typically by drawing or wrapping, the anodic encasement sleeve remains substantially unbonded from the pipe, though it is electrically connected by conductive means. Because of the substantially unbonded relationship between the sacrificial anodic layer and the metallic elements of the pipe, if electrolyte is present under the environmental barrier (due to breaches, installation error, condensation, etc.), the electrolyte may enter the unbonded area between the pipe and the anodic material. This increases the ratio of anodic material to pipe available, which makes the cathodic protection more efficient and effective for an extended duration.Type: GrantFiled: December 6, 1999Date of Patent: April 10, 2001Assignee: United States Pipe FoundryInventor: A. Michael Horton
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Patent number: 6179990Abstract: A method for cleaning a copper-INVAR-copper laminate in an acid solution without inducing a galvanic etching of the INVAR. An initial step of the method forms a circuit element that includes a power supply, the laminate electrically coupled to a negative terminal of the power supply, and a conductive anode electrically coupled to a positive terminal of the power supply. The conductive anode may include a conductive material, such as titanium, that is preferably inert to an acid solution into which the laminate will be subsequently immersed. After turning on the power supply to a voltage between about 1 volts and about 10 volts, the laminate and conductive anode are immersed in the acid solution, so as to form a closed circuit with a voltage bias across acid copper-INVAR-copper interfaces. The voltage bias prevents galvanic action from occurring and therefore protects against galvanic etching of the INVAR.Type: GrantFiled: June 30, 1999Date of Patent: January 30, 2001Assignee: International Business Machines CorporationInventors: Raymond Thomas Galasco, Lawrence Philip Lehman, Roy Harvey Magnuson, Robert David Topa
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Patent number: 6033553Abstract: The present invention relates to the field of cathodic protection of reinforced concrete. A conductive metal is thermally applied onto an exposed surface of the concrete in an amount effective to form an anode on the surface. This establishes an interface between the anode and the concrete. The thermal application is performed in a manner which is effective to impart permeability to the anode. A lithium salt solution selected from the group consisting of lithium nitrate solution, lithium bromide solution, and combinations thereof is applied to the external surface of the anode. The solution migrates by capillary attraction to the interface of the anode with the concrete depositing the lithium salt at the interface. The lithium salt functions as a current enhancing agent. The salt also functions as a humectant absorbing moisture from the atmosphere thereby providing an electrolyte at the interface. These combined effects substantially increase current delivery from the anode.Type: GrantFiled: January 25, 1999Date of Patent: March 7, 2000Inventor: Jack E. Bennett
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Patent number: 6024861Abstract: In an electrically corrosion-proofing process in which the polarity of a metal member having a coating film is set at negative, the duration of setting the polarity of the metal member immersed in an aqueous solution of NaCl at negative is made discontinuous, and a positive-set duration in which the polarity of the metal member is set at positive, is interposed between a proceeding negative-set duration and a succeeding negative-set duration. The switching-over of the polarity is carried out by a polarity switch-over relay between the metal member and a DC power source. In the negative-set duration, the treatment for corrosion-proofing of the metal member is carried out, but the peeling-off of the coating film from a starting point provided by a damaged portion is produced. In the positive-set duration, an electrolytic product is produced in an exposed portion of the metal member, and the peeling-off of the coating film in the next negative-set duration is prevented by the electrolytic product.Type: GrantFiled: December 18, 1998Date of Patent: February 15, 2000Assignee: Honda Giken Kogyo Kabushiki KaishaInventors: Toshihiro Takeuchi, Tadashi Imanaka
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Patent number: 5868920Abstract: The invention concerns a method for inhibition of growth of organisms on faces of constructions (11) submerged in a liquid. In themethod, an electrically conductive structure (11) to be protected is connected as the cathode of a source (14) of direct current, or an electrically non-conductive structure (111) to be protected is first coated with an electrically conductive material (111a) and connected as the cathode of a source of direct current (14), respectively, and, as the anode (12), an anode is used that has been isolated from the structure (11) to be protected or that is placed separate from said structure, which anode is connected as the anode of the source (14) of direct current.Type: GrantFiled: November 24, 1997Date of Patent: February 9, 1999Assignee: Synton OyInventors: Ari Nylund, Martti Pulliainen, Jyrki Peltonen, Timo Laurila, Miki Turkia
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Patent number: 5759361Abstract: An anode for cathodically-protected steel-reinforced concrete is embedded in an ion-conductive overlay on the concrete structure. The anode comprises at least one sheet of highly expanded valve metal mesh having a pattern of voids defined by a network of valve metal strands connected at a multiplicity of nodes. This provides a redundancy of current-carrying paths through the mesh which ensures effective current distribution throughout the mesh even in the event of possible breakage of a number of individual strands. The surface of the valve metal mesh carries an electrochemically active coating. At least one current distribution member is welded to the valve metal mesh. The entire area of the structure to be protected, excluding non-protected openings for obstacles and the like, is covered by a single piece of the mesh, or several pieces in close proximity with one another.Type: GrantFiled: December 16, 1996Date of Patent: June 2, 1998Assignee: Eltech Systems CorporationInventors: John E. Bennett, Gerald R. Pohto, Thomas A. Mitchell
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Patent number: 5667649Abstract: Impressed current anodes such as cathodic protection anodes comprise iron based alloys including less than 70% iron and less than 0.1% carbon. Additional components may include molybdenum, chromium, nickel and others. The iron based alloy may itself comprises the anode or it may provide a substrate to which an electrolytic coating is applied.Type: GrantFiled: June 29, 1995Date of Patent: September 16, 1997Inventor: James B. Bushman
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Patent number: 5643424Abstract: A device and method for preventing fouling and/or corrosion of the exposed surfaces of a structure which is in contact with seawater, brackish water, fresh water, or a combination of these. The system includes using a structure having an exposed zinc-containing surface. At the exposed surface water interface a negative capacitive charge or an asymmetric alternating electrostatic is induced and maintained.Type: GrantFiled: June 29, 1994Date of Patent: July 1, 1997Assignee: Marine Environmental Research, Inc.Inventors: William J. Riffe, Jack D. Carter
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Patent number: 5513694Abstract: A heat exchanger and process for use with a corrosive fluid, such as sulphuric acid, having an anodic protection system for protecting the acid-contacted surfaces wherein the anodic protection system has a plurality of elongated cathodes of such cross sectional area and length as to operably maintain voltage losses due to current flow along the cathodes at values less than the allowable passive voltage ranges at the acid-contacted surfaces.Type: GrantFiled: February 15, 1995Date of Patent: May 7, 1996Inventor: Gordon M. Cameron
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Patent number: 5505826Abstract: A method and apparatus for reducing corrosion on the interior and exterior of a fuel storage tank. A galvanic anode assembly is placed within the interior of or exterior to the fuel storage tank and is surrounded by a layer of hydrophilic gel. The hydrophilic gel absorbs water in the fuel storage tank, thus removing it from contact with the tank. The hydrophilic gel also absorbs metal ions produced as the anode is consumed. The hydrophilic gel is maintained around the anode assembly by a porous container. The anode, hydrophilic gel, and porous container are maintained within a flexible container that allows water and fluid contained within the fuel storage tank to contact the hydrophilic gel. In one embodiment, the hydrophilic gel includes a polyacrylamide material.Type: GrantFiled: November 30, 1994Date of Patent: April 9, 1996Inventors: Patrick G. Haglin, Stuart J. Ell