Abstract: Described is a method of neutralizing acid containing compositions present in an insulation board comprising the steps of providing an insulation board containing a leachable acid composition and neutralizing the leachable acid by applying to the board an effective neutralizing amount of an inorganic alkali metal or alkaline earth metal salt. Preferably, the board is a phenolic foam having opposing sides of a fiberglass facer with the neutralizing agent embedded in the fiberglass facer.

Abstract: A process for controlling corrosion in a wet oxidation system by controlling the operating pH range within the system is described. A pH operating range is selected within which corrosion to the wet oxidation system is minimized. The pH within the wet oxidation system is monitored and a pH adjusting material is added to the waste material being treated to maintain the system pH within the selected pH operating range, thus minimizing corrosion.

Abstract: A process for inhibiting corrosion involves new compositions which comprise an organic material and, a corrosion inhibitor which is a compound having the formula: ##STR1## wherein R.sup.1 and R.sup.2 may be the same or different and each is hydrogen, C.sub.1 -C.sub.15 alkyl, C.sub.3 -C.sub.15 alkenyl, C.sub.7 -C.sub.10 phenylalkyl, C.sub.6 -C.sub.18 aryl having 6 or 10 aromatic ring carbon atoms; or C.sub.5 -C.sub.12 cycloalkyl;R.sup.3 is hydrogen or C.sub.1 -C.sub.4 alkyl; n is 0 or 1;A is a residue of a heterocyclic ring having 5-7 ring members and 1-4 nitrogen atoms, or A is a residue of a heterocyclic ring having 5-7 ring members and 1-4 nitrogen atoms and is fused to a further heterocyclic ring or to a carbocyclic ring, or A is a carbocyclic ring, in particular a phenyl or naphthyl ring, and wherein R is one or more of hydrogen, C.sub.1 -C.sub.15 alkyl, C.sub.1 -C.sub.4 halogenoalkyl, C.sub.1 -C.sub.12 alkoxy, C.sub.1 -C.sub.12 alkylthio, phenylthio, benzylthio, C.sub.1 -C.sub.

Abstract: A method for cleaning, disinfecting and sterilizing hemodialysis apparatus consisting in mixing a basic composition comprising the chlorite ion with an acid composition comprising lactic acid in a mass ratio of the basic composition to the acid composition ranging from 1:6 to 1:3, feeding the mixture thus obtained and admixed with water into the hemodialysis apparatus, the ratio of the mixture to water being of about 1:34 and circulating the final solution in the apparatus wherein the mixture is diluted in water and the basic composition is reacted with the acid composition.

Abstract: A corrosion inhibitor formulation for oil and water systems which formulation is resistant to sludge formation and does not tend to stabilize oil/water emulsions when added to oil and water systems. The corrosion inhibitor includes an imidazoline dissolved in an aromatic solvent, a 2-hydroxyalkylcarboxylic acid such as glycolic acid and a glycol such as hexylene glycol. The imidazoline is preferably prepared from a long chain fatty acid and a polyamine in a molar ratio of about 1.5:1.

Abstract: Disclosed is a method of inhibiting the electrochemical corrosion of stainless steel immersed in an aqueous solution of about 20 to about 40 wt % alkali metal hydroxide at a temperature of less than 100.degree. C. About 2 to about 500 ppm of sodium borohydride, hydrazine, or a mixture thereof is added to the aqueous solution.

Abstract: A method is disclosed for reducing the oxygen content of water using a hydrazine-free dioxo aromatic compound or organically-substituted derivative thereof.

Abstract: Steel sheet coated with a nontoxic, relatively insoluble, inorganic, corrosion resistant coating. A silicate coating is formed on a steel sheet by rinsing the sheet for at least 30 seconds in an alkaline aqueous solution containing 0.005 M silicate, 0.005 M metal salt and having a temperature of at least 25.degree. C. The sheet is dried to form an adherent silicate coating having a thickness of at least 2 nm prior to being treated with an aqueous solution containing 0.5-5 vol.-% silane. If the sheet is painted, the silane film forms an adherent bond between the paint and the silicate coating. A silane treated silicate coating minimizes red rusting on terne coated steel by sealing pin holes. A silane treated silicate coating also provides good corrosion protection and paint adherence on cold-rolled or galvanized steel.

Abstract: An improved method of electroanalytical detection of residual hydroquinone in boiler feedwater employing adding an ionic base and a copper chelant to the feedwater sample. Na.sub.3 PO.sub.4 and ethylenediamine are representative chemicals when square wave voltammetry (SWV) is used as the electroanalytical technique.

Abstract: Calcium or other sulfonate gel in an oil carrier (such as that of U.S. Pat. No. 4,629,753 to Quinn), optionally mixed with a small amount of sodium sulfonate and tall oil fatty acids, can be neutralized with amine, e.g. DMEA, to form a soap which can be dispersed in water. Adding an acrylic emulsion results in an acrylic coating rich in corrosion-retarding alkali metal or alkaline earth metal sulfonates. This finish on metalurgically roughened, e.g. nitrocarburized, metal forms a firm film which can resist greater than 500 hours ASTM B117 salt spray.

Abstract: Certain dithiocarbamates are used as reverse demulsifiers, corrosion and scale inhibitors, flocculants, biocides, flotation aids, water clarifiers, interface control agents and antifoaming agents.

Abstract: A method for cleaning, disinfecting and sterilizing hemodialysis apparatus consisting in mixing a basic composition comprising the chlorite ion with an acid composition comprising lactic acid in a ratio of the acid composition to the basic composition ranging from 1:2 to 4:4, feeding the mixture thus obtained and admixed with water into the hemodialysis apparatus, the ratio of the mixture to water being of about 1:34 and circulating the final solution in the apparatus wherein the mixture is diluted in water and the basic composition is reacted with the acid composition.

Abstract: It has been found out that polyaralkylamines of the formula stated in the claims are useful as corrosion inhibitors for metallic materials; furthermore were found out new polyaralkylamines of the formula stated in the claims and a process for their preparation.

Abstract: A composition, in contact with a corrodable metal surface, comprising:a) an aqueous-based or oil-based system; andb) as an inhibitor for protecting the metal surface against corrosion, at least one compound having the formula I or II: ##STR1## in which R is C.sub.4 -C.sub.20 alkyl, C.sub.4 -C.sub.20 alkyl interrupted by one or more oxygen atoms, C.sub.4 -C.sub.20 alkenyl, C.sub.6 -C.sub.10 aryl, C.sub.7 -C.sub.15 alkaryl, C.sub.7 -C.sub.15 aralkyl or C.sub.5 -C.sub.12 cycloalkyl;R.sup.1, R.sup.2 and R.sup.3 are the same or different and each is methyl or, preferably, hydrogen;M is hydrogen, a metal ion, ammonium or substituted ammonium ion;a is 0 or 1;b is 0 or an integer from 1 to 6, preferably 0, 1, 2 or 3 especially 0 or 1; andc is an integer from 1 to 6; and/or at least one compound having the formula II: ##STR2## in which R, R.sup.3 and a are as defined above.

Abstract: There are disclosed a method of preventing corrosion of the interior surfaces of air compression devices and an anti-corrosion air compressing device designed for carrying out the method. According to the method, a basic solution is supplied to the interior of the air compressor so that acidic water precipitated in the air compressor is neutralized or made basic by the basic solution. This prevents corrosion of the air compressor interior surface and thereby extends the life of the apparatus. The device comprises, a conventional air compressor, and a basic solution dispensing means connected to the air compressor. The dispensing means supplies the basic solution to the interior of the air compressor to neutralize acidic water precipitated in the compressor.

Abstract: The invention is a method of making water-insoluble aliphatic primary or secondary amines, water-soluble or dispersible, which comprises reacting at a temperature of at least 120.degree. C. these amines with water-soluble acrylamide polymer which contains at least 5 mole percent acrylamide to transamidate not more than 50% mole percent of the acrylamide polymer with the water-insoluble aliphatic primary or secondary amine. The invention also covers a water-soluble or dispersible polymeric composition comprising an acrylic acid polymer having a molecular weight within the range of 500-100,000 which contains between 0.5-50 mole percent of the acrylic acid groups in the form of the amides of a water-insoluble aliphatic primary or secondary amine which contains from 10-36 carbon atoms.

Abstract: Imidazolines of the formula: ##STR1## wherein n is a whole number integer of from 1 to 6, are metal corrosion inhibitors.

Abstract: Liquid light duty cleaning compositions comprise an organic base (such as amines), a zinc salt (such as zinc halides or zinc citrate), and a complexing agent (such as EDTA). The compositions are useful in cleaning both at full strength and when diluted and do not cause staining of treated aluminum utensils.

Abstract: An inhibitor composition of sodium hexametaphosphate and a water soluble orthophosphate, together with a pH adjusting, water-soluble alkali, effectively prevents corrosion of metal surfaces by sodium chloride brines. This corrosion inhibitor can be used to prevent corrosion of motor vehicles and steel reinforcing members and structures by brines formed by roadway deicing salt.

Abstract: There is disclosed a method for the protection of metal surfaces against corrosion by the formation of a passivating coating of zinc silicate on the surfaces of the metals exposed to the water. The metal surfaces are preconditioned by contact with water containing a soluble zinc salt in an amount from about 0.5 to about 5 parts zinc per million weight parts of the water while the total alkalinity is maintained above 100 millequivalents by the addition of a water soluble alkaline material, as needed. The pretreatment passivates the metal surfaces with a coating of zinc carbonate, as can be determined by measuring the magnitude of external current flow between electrodes of a test probe maintained in the water.

Abstract: Disclosed is a method for inhibiting corrosion of metal surfaces in contact with H.sub.2 S-containing acid gases streams and aqueous amine scrubbing solutions, which method comprises: contacting the H.sub.2 S-containing stream with amine scrubbing solution in the presence of an effective amount of an ammonium or alkali-metal thiosulfate salt and an effective amount of sulfide and/or hydrosulfide ions.

Abstract: A method for inhibiting corrosion in industrial cooling waters which contain hardness and a pH of at least 6.5, by dosing the water with a composition which comprises a water-soluble inorganic phosphate capable of inhibiting corrosion in an aqueous alkaline environment and a hydrocarbon polymer containing an N-substituted acrylamide polymers with an amide structure as follows: ##STR1## where R.sub.2 is hydrogen or methyl, where R.sub.1 is a hydrogen or an alkyl and R is alkylene or phenylene, and X is sulfonate, (poly)hydroxyl, (poly)carboxyl or carbonyl, and combinations thereof; or containing derivatized maleic anhydride homo-, co- and terpolymers having N-substituted maleamic acid units, N-substituted maleimide units and maleic acid (and salts) units having a structure as follows: ##STR2## where R.sub.1, R.sub.2 and R.sub.

Abstract: Specific sulfonamidocarboxylic acids in the form of the alkali metal or alkanolamine salts are used as corrosion inhibitors in aqueous systems.

Abstract: A composition and method for inhibiting corrosion in industrial cooling waters which contain hardness and have a pH of at least 8, which composition comprises a water-soluble organic phosphonate capable of inhibiting corrosion in an aqueous alkaline environment and a co- or terpolymer of acrylic acid and certain substituted acrylamides such as t-butyl acrylamide.

Abstract: Thickened aqueous automatic dishwashing detergent compositions containing optional bleach-stable surfactant, detergency builder, hypochlorite bleach (to yield available chlorine), a thickening agent and metal salts of long chain hydroxy fatty acids. The compositions have a yield value between 50 and 350 dynes/cm.sup.2 and inhibit tarnishing of sterling and silver-plated flatware.

Abstract: A corrosion inhibited sodium and calcium chloride composition preferably in granular form, which is uniformly coated with a minute to minor quantity of an inhibitor comprising chiefly superphosphate and a minor amount of magnesium oxide. There is also disclosed a method for inhibiting corrosion of sodium and calcium chloride which comprises supplying to the metal surface which is exposed to corrosive attack by sodium and calcium chloride, a minute quantity of an inhibitor comprising chiefly superphosphate and a minor amount of magnesium oxide. The magnesium oxide functions to cement the inhibitor as a tenacious coating on the salt granules, and also to enhance the effectiveness of the phosphate corrosion inhibition.

Abstract: A method for inhibiting sulfide stress corrosion cracking and hydrogen induced stepwise cracking in a metal (e.g. pipeline steel) that comprises contacting the metal at a pH of 5.3 or below with an effective inhibiting amount of a glycolipid-containing product obtained from a fermentation using Torulopsis bombicola.

Abstract: Corrosion of ferrous metal and aluminum surfaces, in particular, is inhibited by a layer of an organic-metallic complex of a polyamine with a (i) metal oxide, or (ii) metallate ion, or (iii) water-soluble metallate salt, in aqueous systems having a pH greater than about 7. The polyamine contains at least four (4) amine groups, two of which are secondary amine groups. The effect of the N atoms stretched over the length of the polyamine produces a "caging effect"0 which immobilizes the oxide, or metallate ions, thus forming the protective layer. The organic-metallic complex deposited on the metal's surface forms the "amine-metallic" layer which may be either an "amine-metal oxide complex" which is a coordination complex, or, an "amine-metallate complex". The amine-metallate complex may be either an ionic complex of "amine.

Abstract: A corrosion inhibitor for ferrous and non-ferrous aqueous systems comprising (a) a water soluble phosphonic acid or salt thereof, preferably an amino methylene phosphonic acid; (b) a phosphonocarboxylic acid, preferably a phosphonoalkane carboxylic acid; (c) an azole, preferably benzotriazole or tolyltriazole; and (d) a water soluble molybdate salt, preferably sodium molybdate.

Abstract: A method of treating the surface of a cathode in order to remove therefrom deposited iron, the cathode comprising a metallic substrate at least part of the surface of which has been activated in order to reduce the hydrogen overvoltage at the cathode when the cathode is used in the electrolysis of water or aqueous solutions, and the method comprising contacting the surface with a liquid medium which reacts with and solubilizes the deposited iron.Removal of deposited iron results in a decrease in the hydrogen overvoltage of the cathode. The liquid medium may be an aqueous acidic solution and the cathode may be contacted with the liquid medium in situ in the electrolytic cell.

Abstract: A silicone/silicate-containing antifreeze characterized by dilute aqueous stability includes substituted organosilicon carboxylates characterized by the following formula: ##STR1## wherein M is a monovalent cation such as, for example, sodium; Z represents a moiety hydrolyzable to silanol; R.sup.1 represents hydrogen, a monovalent hydrocarbon radical such as methyl, ethyl, phenyl, and the like or a substituted monovalent hydrocarbon radical; a has a value from 0 to 20, b has a value of 1 or 2, c has a value of 0 or 1, n has a value of 2, 3, or 4, and m has a value of from 3 to 15 when a is other than 0 and from about 7 to about 15 when a is 0.

Abstract: A composition and method for inhibiting corrosion in industrial cooling waters which contain hardness and have a pH of at least 8, which composition comprises a water-soluble organic phosphonate capable of inhibiting corrosion in an aqueous alkaliine environment and a hydrocarbon polymer containing an N-substituted acrylamide polymer with an amide structure as follows: ##STR1## where R.sub.2 is hydrogen or methyl, R.sub.1 is a hydrogen or an alkyl and R is alkylene or phenylene, and X is sulfonate, (poly)hydroxyl, and combinations thereof.

Abstract: A method for inhibiting corrosion in industrial cooling waters which contain hardness and a pH of at least 6.5, by dosing the water with a composition which comprises a water-soluble inorganic phosphate capable of inhibiting corrosion in an aqueous alkaline environment and a hydrocarbon polymer containing an N-substituted acrylamide polymers with an amide structure as follows: ##STR1## where R.sub.2 is hydrogen or methyl, R.sub.1 is a hydrogen or an alkyl and R is alkylene or phenylene, and X is sulfonate, (poly)hydroxyl, (poly)carboxyl or carbonyl, and combinations thereof; or containing derivatized maleic anhydride homo-, co- and terpolymers having N-substituted maleamic acid units, N-substituted maleimide units and maleic acid (and salts) units having a structure as follows: ##STR2## where R.sub.1, R.sub.2 and R.sub.

Abstract: A composition and method for inhibiting the attack of aqueous corrosive fluids on metal by contacting the metal with a composition including an .alpha.,.beta.-unsaturated aldehyde and a surfactant.

Abstract: The present invention provides a method of inhibiting the corrosion of nonferrous metals using an anticorrosive agent selected from 3-amino-5-(.omega.-hydroxy-n-alkyl)-1,2,4-triazoles having the general formula: ##STR1## wherein x is an integer in the range of from 1 to 12; salts of the compounds of formula (I) with inorganic acids; and salts of the compounds of formula (I) with organic acids.

Abstract: The use, as anti-corrosion agents, of alkenylsuccinic acid half-amides of the formulae ##STR1## in which R denotes C.sub.6 -C.sub.18 -alkenyl, R.sup.1 denotes C.sub.12 -C.sub.18 -alkyl and K denotes a proton, an alkali metal ion or an ammonium ion of the formula NHR.sup.2 R.sup.3 R.sup.4, and R.sup.2, R.sup.3 and R.sup.4 are identical or different and denote hydrogen, C.sub.1 -C.sub.12 -alkyl, 2-hydroxyethyl or 2-hydroxypropyl.

Abstract: Certain polymers of vinylsulfonic and methacrylic acid promote the formation of passive, protective oxide films on steel surfaces under alkaline boiler conditions and at high pressures e.g. pH 11 1,000 to 1,500 psi, while giving good control of mineral deposition in the boiler.

Abstract: A process and composition using hydroxyphosphonoacetic acid or its water-soluble salts in combination with certain copolymers, such as water-soluble 1-acrylamido-2-methylpropane sulfonic acid copolymers with acrylic acid or methacrylic acid, provide improved corrosion protection for iron based metal in contact with the system water of aqueous systems.

Abstract: Brass, bronze and other mixture of copper and zinc use used to treat alkanolamine solutions used in systems for separating CO.sub.2 from gaseous mixtures to give enhanced protection against ferrous metal corrosion.

Abstract: A multifunctional corrosion inhibitor consisting essentially of an alkali metal borate, an alkali metal nitrate, an alkali metal nitrite, an alkali metal metasilicate, an alkali metal phosphate, mercaptobenzothiazole and at least one selected surfactant.

Abstract: Methods for chemically scavenging oxygen from an aqueous medium are disclosed. Linear, water soluble polyethyleneamines, such as pentaethylenehexamine, are added, as the sole oxygen scavenger, to the desired aqueous medium. Suitable environments for use of these amines comprise boiler feedwater and boiler steam condensate systems.

Abstract: Herein is described a technique for maintaining a copper ion in the plus 2 oxidation state, as it is employed as an inhibitor in an alkanolamine gas conditioning absorbent solution to provide corrosion protection of the metals in contact with the alkanolamine solution. The procedure disclosed for maintaining copper in the plus 2 state is to apply an induced or impressed voltage across a point, or several points, in the circulating copper containing solution of the gas conditioning plate for the recovery of CO.sub.2 from flue gas particularly when oxygen is present in the gas being treated.

Abstract: An automobile coolant concentrate comprising (a) a liquid polyhydric alcohol, and (b) a corrosion inhibitor comprising an alkali metal antimony tartrate, preferably with an azole compound, in a corrosion inhibitory amount with respect to corrosion of lead-containing solders.

Abstract: A continuous process and apparatus for the analysis of a sample containing a peroxycompound in the presence of hydrogen peroxide using known colorimetric techniques, characterized in that a sample is taken continuously, is continuously mixed with a colorimetric reagent and is divided into two streams, and continuous differential colorimetric analysis of the two streams is effected to provided a differential signal, further characterized in that one such stream is heated to such a temperature that the peroxycompound reacts with the colorimetric reagent prior to effecting the differential colorimetric analysis, whereby the differential signal is a measure of the concentration of such peroxycompound. The process and apparatus may be modified in that a third stream is taken not containing any colorimetric reagent, and two differential colorimetric analyses are effected, whereby a further signal is obtained which is a measure of the concentration of the hydrogen peroxide.

Abstract: To control build-up of paint in the water tank an alkaline liquid containing NaOH is added in quantities to maintain a pH not substantially less than 9, thus preventing corrosion, and a hydroxide ion concentration not exceeding 0.01M. The additive is introduced by a metering pump under the control of a programmed timer over a seven day cycle. Over half the amount to be added in the cycle is introduced as a single discrete dose (preferably before a weekend) and the rest as smaller doses at intervals.

Abstract: This invention relates to amino hexahydropyridines, and to the preparation and use thereof as corrosion inhibitors.

Abstract: A corrosion inhibitor for ferrous and non-ferrous aqueous systems comprising (a) a water soluble phosphonic acid or salt thereof, preferably an amino methylene phosphonic acid; (b) a phosphonocarboxylic acid, preferably a phosphonoalkane carboxylic acid; and (c) a triazole, preferably benzotriazole or tolyltriazole.

Abstract: Methods for chemically scavenging oxygen from an aqueous medium comprising the addition of linear, water soluble polyethyleneamines, such as tetraethylenepentamine and triethylenetetramine, as the sole oxygen scavenger, to the desired aqueous medium. Suitable environments for use of these amines comprise boiler feedwater and boiler steam condensate systems.

Abstract: Composition for inhibition of ferrous metal corrosion consisting essentially of (a) HEDPA compound and (b) HPAA compound. Optionally the composition may also include (c) an azole.

Abstract: A method of inhibiting zinc corrosion in aqueous systems comprising adding an effective amount of a bis(aminotriazole) or a bis(mercaptotriazole), whose bridge may be substituted by a C.sub.0-10 -alkyl.