Abstract: 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:

Abstract: Humectants are applied to cathodic protection systems which utilize thermally-sprayed zinc or zinc alloy anodes applied to the surface of reinforced concrete structures. The humectants are deliquescent or hygroscopic organic or inorganic salts, hydrophilic polymers or colloids, or organic liquid desiccants. The humectants are positioned at or near the interface between the anodes and the concrete and increase the moisture content at the interface. This increases the ability of the anode to deliver cathodic protection current to steel embedded in the concrete. The humectants may be applied to the concrete surface prior to application of the anode, or may be applied subsequent to installation of the anode.

Abstract: A concrete structure is reinforced with steel rebars coated with essentially pure aluminum in the range from about 0.25 mm to 2 mm thick upon which aluminum coating is an aluminum oxide layer in the range from 0.1 &mgr;m to 100 &mgr;m thick. This layer of aluminum oxide and/or hydrated aluminum oxide is referred to as a combined aluminum oxide layer, and it is in direct contact with the concrete.

Abstract: 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.

Abstract: Galvanic protection of a reinforced concrete structure or a metallic structure immersed or partially immersed in water or seawater utilizes a sacrificial anode having a more negative electrode potential than that of the metal to be protected but connected to the reinforcement or metallic structure, and the anode immersed in electrolyte solution creating an corrosive environment for the anode. The electrolyte solution must exist for internal charge transfer by ionic conductance, and to complete the electric circuit of the galvanic cell therefore both the metal or reinforced structure and the sacrificial anode have to be immersed in an electrolyte solution. The anode will provide in that way sufficient current to protect the reinforcement or metal structure against corrosion. The present invention resides in a method where the sacrificial anode immersed in an electrolyte solution can be positioned on a remote location e.g. in a small container away from the reinforced concrete or metal structure.

Abstract: Combining an electroosmosis direct current (EP) applied at less than 1 mA/Mcm3 (milliamp per 1000 cm3 of concrete) with an anode placed adjacent an outer surface of reinforced concrete soaked with a substantially neutral saline solution, effectively depletes corrosive anions in the concrete even when the direct current is in the range from 0.01 mA to less than 1 mA and at a voltage less than 100 V. Further, using such electroosmotic treatment as a first treatment, and promptly following it with cathodic protection, preferably by an impressed cathodic current (CP) at a comparably low voltage, the current density of CP required for cathodic protection is unexpectedly reduced. This decrease in the required current density of impressed current CP, coupled with low installation and operational costs of the novel system, improves the efficiency of a conventional cathodic protection system, whether by impressed current or with sacrificial anodes, several fold, as high as by a factor of 3 to 30 times.

Abstract: 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.

Abstract: The invention provides a method of inhibiting or preventing corrosion of reinforced steel in concrete by eliminating the differences in surface potentials that result in the total passivation of corrosion activity and create an environment in the steel that does not allow corrosion. The method, optionally includes measuring the active non-uniform surface potential in the steel and passing a DC voltage through the concrete and steel to stop corrosion providing a substantially uniform surface potential on the reinforced steel. The current is controlled and adjusted to send pre-determined amounts of electrical energy to individual areas targeted for treatment. A corrosion potential survey may be conducted to determine the energy requirements necessary for the corrosion condition or a reference electrode may be strategically placed on the concrete structure.

Abstract: A steel-reinforced structure supplied with an aqueous solution of an inhibitor for the strucutre, is further protected against deterioration when an impressed cathodic current is applied; preferably the structure is continuously bathed in the inhibitor solution; flow of the first impressed current is maintained until flow is relatively constant at a level at least one-half the level at which the first impressed current was initiated. The concentration of ions is sensed by measurement of the current flow while maintaining a chosen voltage. The inhibitor solution may be used in conjunction with an electroosmotic current to drive ions into the concrete and towards the steel; this may be done prior to applying the cathodic impressed current, or concurrently therewith by providing secondary electrodes. Program controller means in the power station switches from one mode of delivery to another when current usage, measured by current density, is deemd to have become uneconomical.

Abstract: There is described a method of cathodic protection, electrochemical chloride extraction and realkalisation in reinforced concrete or similar materials, and also reinforcement and crack prevention in concrete (1), comprising the impressing of a direct voltage between the reinforcement in the concrete (1) and a conductive device which is brought into contact with the surface of the concrete (1), and wherein the crack preventing effect is obtained by embedding the device in fresh concrete. The method is characterised in that as conductive device/current distributors there is used a mat (3) of optionally coated, conductive carbon fibers produced by blowing, pressing, weaving or knitting so that the fibers lie in almost every direction, and wherein the fibers are of different thickness, wherein the mat further comprises electric conductors (4) in the form of bands or wires of conductive material which are placed over or under the mat (3) or are incorporated therein.

Abstract: A system for preventing corrosion of a surface of a metal structure in contact with a corrosive environment comprising:

Abstract: A concrete structure is reinforced with steel rebars coated with essentially pure aluminum in the range from about 0.25 mm to 2 mm thick upon which aluminum coating is an aluminum oxide layer in the range from 0.1 &mgr;m to 100 &mgr;m thick. This layer of aluminum oxide and/or hydrated aluminum oxide is referred to as a combined aluminum oxide layer, and it is in direct contact with the concrete.

Abstract: Cathodic protection of a structure including a steel member at least partly buried in a covering layer, such as steel rebar in a concrete structure, is provided by embedding sacrificial anodes into the concrete layer at spaced positions over the layer and connecting the anodes to the rebar. Each anode is inserted into a drilled hole in the layer and is electrically attached to the rebar in the same or an adjacent hole by a steel pin which is attached to the reinforcement by arc welding or by impact. In the arrangement where the anode and the attachment are in the same hole, the pin passes into or through the anode so as to hold the anode rigidly within the hole. The hole is filled by a settable filler material.

Abstract: A first electrode layer and a second electrode layer cover the surface of an object. The electrode layers are separated by a relatively large interelectrode distance, usually not exceeding 10 mm. Conductive ice or liquid water fills the interelectrode space between the electrodes, providing electrical connection of the electrodes. A DC or a low-frequency AC voltage is applied across the electrodes. The applied voltage causes electrolysis of water molecules at the electrodes, resulting in generation of hydrogen and oxygen gas bubbles. Optionally, a DC power supply generates sparks that ignite a mixture of the hydrogen and oxygen gases.

Abstract: The present disclosure relates to a cathodic protection system for inhibiting oxidation of a reinforcing member disposed within a cementitious structure. The system comprises a compact, autonomous battery adapted to mount to the cementitious structure at an open-air location, the battery having a positive terminal and a negative terminal, a conductor adapted to electrically connect the negative terminal of the battery to the reinforcing member of the cementitious structure, an anode jacket constructed of a cementitious material and being adapted to be placed in physical contact with the cementitious structure, and an anode disposed within the anode jacket and being adapted to be positioned proximate to a portion of the reinforcing member disposed within the cementitious structure that is to be cathodically protected, the anode being electrically connected to the positive terminal of the battery.

Abstract: Electric current of about 1 A/M2 is applied to reinforcement in concrete and the gases released are allowed to pass to the atmosphere via gas permeable set material in a hole alongside the electrode.

Abstract: An apparatus for prevention of corrosion in metal objects uses a capacitively coupled fastener or pad attached to a metal body being protected from corrosion. The metal body and the negative terminal of a source of DC voltage (battery) are grounded. The positive terminal of the source of DC voltage is connected to electronic circuitry that imparts pulses of low voltage DC through the capacitor to the fastener. These pulses of electrical current inhibit the oxidation of the metal object by providing a source of electrons to the oxidizing chemicals in contact with the metal. The electronic circuitry includes a reverse voltage protector to prevent the application of reverse source voltage. The circuitry also includes a power conditioner to supply a constant DC voltage to a microprocessor. The microprocessor generates pulses of DC signals that are amplified by a pulse amplifier and imparted to the conductive facing of the pad. The invention also includes a battery voltage monitor and a power indicator.

Abstract: 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.

Abstract: An electro-chemical process for rehabilitating steel reinforced concrete, wherein a distributed flow of electrical current is established between internally embedded reinforcing steel, connected as a cathode, and an external, distributed electrode, connected as an anode. Current flow at a rate of at least 0.1 ampere per square meter of surface area of the embedded reinforcement is continued for a time sufficient to provide a total charge of at least about 100, but not substantially more than 2000, ampere-hours per square meter of surface area of the embedded reinforcement. This results in steel with a clean surface, surrounded by concrete which is chloride free and highly alkaline. After discontinuance of the electrochemical treatment, the embedded steel slowly passivates by forming a protective surface oxide. The process is significantly more economical than known procedures, yet is reliably effective.

Abstract: 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.

Abstract: A process for the electrochemical realkalization of reinforced concrete comprises passing a direct electric current between an anode associated with a layer of alkaline electrolyte applied to an external surface of the concrete and a cathode which is located internally in the concrete. The process causes the internal pH of the concrete to increase and a surface layer of the concrete to be impregnated with the electrolyte solution and which comprises a solution of potassium carbonate of concentration at least 0.3 Molar. The process may be applied to concrete a zone of which has a pH of less than 10.0 and the process continued until the pH reaches a level of at least 10.5, preferably at least 11.0.

Abstract: This invention relates generally to an electrically conductive valve metal mesh of extreme void fraction. More particularly the invention relates in a most important aspect to an application thereof for an electrode structure in such a way as to prevent the corrosion of steel, including reinforcing steel in concrete, by cathodic protection.

Abstract: An anode is embedded in an electrolyte layer applied to the surface of a structure such as a pipe section to provide an ionic conductive path between the anode and structure to supply cathodic protection to the structure, where the natural environment may not provide a continuous electrolyte. The anode is comprised of a material normally used as a cathodic protection anode material, such as, an expanded valve metal mesh or ribbon having either an electrochemically active coating or noble metal coating, or a sacrificial anode metal alloy. The anode material is made continuous from one end of the structure to the other and may be connected to a common bus wire from one end to the other. The anode and structure to be protected are connected using wires to a DC power supply that causes cathodic protection current flow to the structure in the case of an impressed current system. No separate power supply is needed in the case of a galvanic or sacrificial anode system.

Abstract: A cathodic protection system for protecting buried conducting structures, subject to corrosion such as well casings, pipe lines and the like, utilizes a plurality of pulsed D.C. current sources with the negative output terminal of each source connected to a separate structure and the positive output terminal of the sources connected to a common anode located near the structures. A control circuit synchronizes the operation of the several D.C. sources and sets the frequency and width of the output pulses. The amplitude of the output pulses from each D.C. source may be separately adjusted.

Abstract: Apparatus, compositions and methods provide cathodic protection to a structure by placing an anode layer (10) directly between the structure (22) and its underlying foundation (30). Structures contemplated to be protected in this manner include especially very large structures such as above ground storage tanks. In one aspect of preferred embodiments, the anode layer (10) comprises sheets of at least 85% aluminum with other alloying elements such as magnesium (0.05 to 6%), zinc (0.1 to 8%), indium (0.005 to 0.03%) and tin (0.05 to 0.2%) added for the purposes of optimizing current yield, polarization and ease of manufacturing the sheet.

Abstract: The present invention relates to a method of cathodic protection of reinforced concrete, and more particularly, to a method of improving the performance and service life of discrete anodes used in a cathodic protection system. The method of the present invention comprises placing an embeddable discrete anode in, or on, the reinforced concrete member. The discrete anode is then embedded in a cementitous grout or mortar to encapsulate the anode and provide contact to complete the cathodic protection circuit. A lithium salt selected from the group consisting of lithium nitrate (LiNO3), lithium bromide (LiBr), and combinations thereof, is added to the cementitous grout or mortar surrounding the discrete anode, in the amount of at least about 0.2 gram (dry basis) per cubic centimeter of grout or mortar. The lithium salt functions to enhance the performance of the cathodic protection system by minimizing the deleterious effects of the anode reaction product on the grout or mortar adjacent to the anode.

Abstract: 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.

Abstract: Cathodic protection of concrete-reinforcing steel reinforcing elements is accomplished utilizing an anode of a metal (e.g. zinc) having a more negative electrical potential than the steel reinforcing element, and connecting at least one wire made of a ductile metal to the anode. The anode may be cast around the wire, or a twisted portion of two or more wires. The wires are wrapped around one or more of the reinforcing elements and electrically and physically connect the anode to the reinforcing elements. The cathodic protection is maintained over a sustained period of time by casting a cementitious material around the anode, e.g. a mortar containing an electrolyte solution having a pH of at least about 14 when the anode is zinc.

Abstract: Restoration of a concrete roadway is effected by application onto the upper surface of the roadway of steel sheets which are used as an anode for electrolytic transfer of ions between the anode and the reinforcing bars of the concrete as cathode. The steel sheets are placed in effect directly on top of the concrete surface so as to communicate forces from the traffic to the concrete surface without the necessity for separate support of the sheets. An intervening layer may be formed of particulate material, a very thin felt or there may be no intervening layer. The sheets can be formed by two layers of steel with the upper layer embossed and the edges offset so as to define flanges allowing the sheets to be bolted together. A covering wear layer such as asphalt can be applied on top of the sheets.

Abstract: An existing concrete structure is restored by embedding sacrificial anodes into the concrete layer at spaced positions over the layer and connecting the anodes to the reinforcing members to provide a cathodic protection against corrosion. Each anode is inserted into a drilled hole in the layer of sufficient depth to expose the reinforcement. A steel pin passes through a bore in the cylindrical anode and is attached to the reinforcement by arc welding or by impact so as to hold the anode rigidly within the hole. The hole is filled by a settable filler material. In order to maintain effective current conduction from the anode to the reinforcement through the filler over an extended period to maintain the required protection, there is added a material to hold the pH in a preferred range of the order of 12 to 14 and a deliquescent material to absorb moisture into the filler.

Abstract: An electrochemical electrode of a tube of porous titanium suboxide with a contact connection to an electrical supply.

Abstract: A flexible, nonstretchable, titanium, ladder anode for cathodic protection of steel reinforced concrete structures formed of multiple titanium strips including multiple electric current-carrying titanium strips. Ladder anodes of titanium without an electrocatalytically active metal coating can be used in a cathodic protection system operated at an anode current density up to about 20 milliamps per square foot. Ladder anodes of titanium having an electrocatalytically active metal coating are additionally useful at higher anode current densities. The ladder anodes form at the intersections of the strips less than 200 nodes per square meter and have a surface area of about 500 to about 900 square inches per pound.

Abstract: 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.

Abstract: An electrolytic restoration of concrete includes an anode positioned at a surface of the concrete to be restored and the communication of a current from the anode to the reinforcing bars in the concrete as a cathode. The anode is in the presence of or carries an electrolyte so that sufficient current is provided temporarily over a sufficient period of time so that ions from the concrete are carried through the concrete and expelled into the electrolyte for extraction. The anode is provided by layer of conductive material which is particulate or fibrous so that it is an amorphous layer which can therefore follow the surface of the concrete. In a horizontal arrangement, the layer can be applied directly onto a felt mat for carrying electrolyte.

Abstract: 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.

Abstract: A multiple ply composite structure used to reinforce, seal and shape concrete structures has a first ply formed of unidirected continuous filament reinforcements which are bonded together by a thermosetting polymeric resin matrix. A second ply comprises a plurality of separately spaced protuberances, each of which is individually coated with a hardenable thermosetting polymeric resin. The hardenable thermosetting polymeric resin of the second ply bonds the first ply to the second ply by forming a concave resin meniscus which anchors each of the protuberances of the second ply to the first ply.

Abstract: The present invention resides in a method for cathodic protection of and/or chloride removal from a reinforced concrete structure. The method comprises the steps of: providing an anode comprising a conductive corrodible metal; providing a corrosive environment for said anode; electrically connecting the anode and the reinforcement of the concrete structure; distributing the current flow from the anode across a surface of the concrete structure; and positioning a humectant at said surface in an effective amount to increase the current flow from the anode. The present invention can also be used to migrate lithium into concrete, thus mitigating alkali-aggregate deterioration.

Abstract: A method of protecting reinforced concrete structures comprising of applying a protective cathodic coating containing a non-corroding metal and an electrochemically active material on concrete wherein the protective coating is formed by thermally spraying a mixture of said non-corroding metal such as a valve metal and said electrochemically active material. The coating may also be formed by applying a precursor of the electrochemically active material and a metal-containing layer to concrete, then anodically polarizing said metal layer to convert the precursor into an electrochemically active material.

Abstract: 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.

Abstract: This invention relates to a method of inhibiting alkali-silica or alkali-aggregate reactions (AAR/ASR) in concrete structures by introducing lithium compounds or the like in conjunction with conventional techniques for the treatment of steel reinforcement corrosion.It is also proposed to provide lithium compounds in repair concretes, grouts or mortars and use the difference in concentration between the article under repair and the repair material to introduce the lithium ions into the concrete under repair, once again inhibiting AAR/ASR reactions.

Abstract: A jacketed anode assembly for use in a sacrificial anode cathodic protection system deployed to impede corrosion of steel or steel reinforcement in pilings or similar supporting columns. A non-conductive jacket formed of mating shell halves is lined along its interior surface with sheets of expanded metal such as expanded zinc. The metal sheets are of a composition higher on the galvanic series than the steel reinforcement such that the sheets serve as sacrificial anodes when coupled with the steel reinforcement. The jacket and zinc lining are installed as a unit on the piling with the jacket interior surface facing the periphery of the piling and in spaced apart relationship therewith. In this space, a filling material can be introduced to both secure the metal sheets in place between the jacket and piling as well as serve as an electrolyte between the steel reinforcement and the metal sheet.

Abstract: A method for detecting the presence or absence of corrosion of cathodically protected steel structures in soil and concrete in which the cathodic protection circuit is subjected to an electrochemical impedance spectroscopic analysis and the presence of corrosion is indicated by the presence of a Warburg impedance.

Abstract: An ionically conductive agent having means for reducing passivation of metal subject to anodic dissolution is disclosed. The ionically conductive agent is interposed between metal to be protected from corrosion and metal to be sacrificed to provide cathodic protection. An electrical connection between the two metals completes a galvanic circuit. The means for reducing passivation can be either a complexing agent for ions of the metal to be sacrificed or can be a membrane to inhibit flow of ions that would affect the ability of the ionically conductive medium to support continued anodic metal dissolution. The ionically conductive agent and a system for cathodic protection using the ionically conductive agent is particularly suitable for a galvanic circuit to cathodically protect reinforcement bars in concrete structures such as transportation bridges, transportation highways, parking facilities, and balconies exposed to corrosive environments.

Abstract: 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.

Abstract: For cathodic protection against corrosion of steel reinforcements in reinforced steel constructions, a prefabricated anode is provided which has a core of titanium expanded metal provided with an activation layer and with a cement-containing ion-conductive jacket; the prefabricated anode is immovably secured to the reinforced concrete construction in an ion-conductive bond; after that, the reinforcement of the concrete construction and the core of the anode are connected to the poles of a direct voltage source.

Abstract: A process and system for rehabilitating mature concrete structures, which have become carbonated and/or infused with chlorides and thus represent a corrosive environment for internal reinforcing steel. The surface of the concrete is first repaired with a special mortar having resistivity and capillarity consistent with the parent concrete and the process requirements. An elongated, flat, flexible, ribbon-like electrode element is supported in spaced relation over the surface of a concrete area to be treated, being threaded back and forth and oriented in edgewise fashion to the concrete surface. Thereafter a self-adherent, cohesive mixture of delignified cellulose pulp fibers and a liquid electrolyte solution is sprayed onto the surface of the concrete, to a level to cover and embed the ribbon-like electrode element, forming an electrolytic medium associated with the electrode element.

Abstract: The invention relates to a method for fixing an electrode arrangement to be used in the cathodic protection of concrete structures. In the method, an anode (20) is mounted in a framework (11) and the framework with its anodes is mounted on the concrete structure at a production plant or in the mounting step before the concreting step. The invention also relates to a fixing element (10) of the electrode arrangement to be used in the cathodic protection of concrete structures, which fixing element is comprised of an anode (20) and a framework (11), which framework (11) is provided with means (15) for fixing the element (10) to the concrete structure.