Abstract: A corrosion inhibitor is disclosed which is produced by reacting an aqueous alkanolamine solution with an acid gas to form an amide and an alkanolamine salt, mixing aqueous alkanolamine with said amide and said alkanolamine salt in the absence of added inorganic base, and reacting the mixture at elevated temperature.

Abstract: A detergent composition which prevents tarnishing of silver and silver-plated articles is described. The composition comprises 1-20 weight percent of a peroxygen or hypohalite bleaching agent, 0.05 to about 10 weight percent of a purine class compound used as a silver anti-tarnishing agent, from 1 to 75 weight percent of a builder, and 0 to 40 weight percent of a surfactant provided that the pK.sub.a of the purine class compound is below a pH of an aqueous solution of the composition in which it is incorporated. A method of using the composition is also described.

Abstract: Corrosion cracking and blistering of steels in contact with refinery streams containing cyanide is inhibited or prevented by treating said stream with a reaction product or products obtained by reacting morpholine and formaldehyde. The preferred corrosion cracking and blistering inhibiting treatment product is bis--morpholinyl-- methane.

Abstract: A method for inhibiting corrosion of a metal surface in a liquid medium is described. The method comprises incorporating into the medium a corrosion inhibiting amount of a combination of a surfactant that forms a bilayer on the metal surface in the fluid and a corrosion inhibitor that solubilizes in the medium in the presence of the surfactant. The amount of surfactant is sufficient to produce a bilayer on the metal surface in the medium. The combination isa. an anionic surfactant that forms a bilayer on the metal surface and a cationic corrosion inhibitor;b. a cationic surfactant that forms a bilayer on the metal surface and an anionic corrosion inhibitor;c. an ionic surfactant that forms a bilayer on the metal surface and an ionic corrosion inhibitor having a pendent, generally straight chain hydrocarbon or substituted hydrocarbon moiety of from about 10 to about 18 carbon atoms; ord. an ionic surfactant that forms a bilayer on the metal surface and a non-ionic corrosion inhibitor.

Abstract: A method of inhibiting the corrosion of iron-based metallurgies in contact with cooling water systems under severe corrosion inducing conditions comprising adding to said cooling water an aqueous combination of an alcohol, an acid, a fatty imidazoline, and an ethoxylated fatty diamine.

Abstract: A vapor phase corrosion inhibitor-desiccant composite comprising silica gel granules coated with a vapor phase corrosion inhibitor component. The corrosion inhibitor component is selected from a formulation comprising anhydrous molybdates such as ammonium dimolybdate, sodium molybdate and amine molybdates mixed with benzotriazole and sodium nitrate, or from a formulation comprising amine benzoates, amine nitrates and benzotriazole. The composites can be impregnated into foam, extruded with polyolefin films which can additionally be laminated with metallized second film, or encapsulated in an air-permeable container. The corrosion inhibitor formulations have vapor pressures which provide ongoing corrosion protection for susceptible articles situated favorably with respect to the composite.

Abstract: A composition and method for inhibiting corrosion of iron and iron-containing metals in contact with aqueous systems containing sulfide compounds. The composition comprises (A) an aqueous solution of an alcohol, an acid, a fatty imidazoline, and an ethoxylated fatty diamine, and (B) an aqueous solution of a molybdate compound or salt thereof.

Abstract: Corrosion inhibiting compositions for metals subjected to highly acidic environments may be produced by reacting in a condensation reaction a styrene-maleic anhydride copolymer with a polyamine (or combination of polyamines) to produce a polyimidoamine inhibitor. A preferred inhibitor product may be produced by replacing up to 80% of the styrene-maleic anhydride copolymer with a member selected from the group consisting of: rosin, C.sub.23 -C.sub.24 modified rosins, C.sub.8 -C.sub.20 fatty acids, C.sub.9 -C.sub.22 modified fatty acids, and combinations thereof. These inhibitors exhibit excellent film forming and film persistency characteristics.

Abstract: Corrosion, cracking and blistering of steels in contact with water containing refinery streams contaminated with cyanide is inhibited or prevented by treating the streams with a cyanide reactive scavenger comprising at least one amine-aldehyde reaction product.

Abstract: An oxygen scavenging composition comprising an intimate mixture of (A) a compound having a skeleton of the following formula (1), ##STR1## wherein R is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, m is an integer of 3 to 5, and n is an integer of 1 to 3, provided that m+n equals 6,(B) a transition metal compound and (C) a phosphorus compound. This composition is useful in a variety of fields requiring prevention of rust formation on metal, prevention of oxidation and decay of an organic substance, preservation of foods, prevention of insects and prevention of mold.

Abstract: A method of removing dissolved oxygen from boiler water having and alkaline pH is disclosed. The method uses at least one hydrazone compound of one of the following formulae: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from hydrogen, C.sub.1 -C.sub.16 alkyl, aryl, substituted alkyl or substituted aryl, and R.sup.5 and R.sup.6 are independently selected from hydrogen, C.sub.1 -C.sub.16 alkyl, aryl, substituted alkyl, or substituted aryl, ##STR2## Preferably, an oxidation-reduction catalyst such as Cu(II) is used as well. The hydrazones used in the present invention are highly shelf stable and do not suffer the toxicity of hydrazine.

Abstract: A method for inhibiting corrosion of metal surfaces in an aqueous medium, comprising incorporating into the medium a corrosion inhibitor in an amount sufficient to inhibit corrosion, the corrosion inhibitor comprising a water-soluble agent selected from the group consisting of compositions of the formula ##STR1## compositions of the formula and mixtures thereof, wherein R is R.sup.2 --(OCH.sub.2 CH.sub.2).sub.x --wherein R.sup.2 is a substituted or unsubstituted alkyl, aryl, or aralkyl group of from about five to about fifteen carbon atoms, each carbon atom having at least one hydrogen and x is an integer of from about one to about ten, and R'N is a basic nitrogen compound that is at least water-dispersible.

Abstract: A corrosion resistant film with a low coefficient of friction that facilitates automatic conveying can be formed on the surface of tin-plated steel or of aluminum, particularly DI cans of one of these types of metal, by contacting the aluminum or the tin plated steel with an aqueous liquid composition having a pH in the range from 2.0 to 6.5 and containing:(A) from 1 to 30 g/L of phosphate ions,(B) from 0.1 to 10 g/L of condensed phosphate ions, and(C) from 0.1 to 20 g/L as solids of water-soluble polymers of N-vinylphenol substituted on the phenolic rings with dialkylaminomethyl groups.

Abstract: Antifreeze concentrate is disclosed having water soluble liquid alcohol freezing point depressant and corrosion inhibitor comprising carboxylic acids or their salts and a triazole compound, wherein the concentrate contains: (1) C.sub.5 -C.sub.16 aliphatic monobasic acid or the alkali metal, ammonium or amine salt thereof; (2) hydrocarbyl triazole; and (3) imidazole.

Abstract: Compounds of general formula ##STR1## wherein: R is a linear or branched C.sub.1 -C.sub.20 alkyl radical, m is either 0 or 1; n has a value of from 1 to 10, are corrosion inhibitors, suitable for inhibiting the general corrosion and the stress brittlening caused by hydrogen sulfide (SSC), in an acidic environment, in the presence, or absence of carbon dioxide, of medium-and high-strength manganese steels and low-alloy steels, commonly used in petrochemical facilities and in bore drilling, transport and processing systems for natural gas or petroleum.

Abstract: A method for inhibiting corrosion of ferrous surfaces in an acidic, aqueous medium is disclosed. The method comprises incorporating into the medium a corrosion-inhibiting amount of a pyridine salt composition (comprising a quaternary pyridine salt composition and/or a pyridine.HCL salt composition) and a cationic surfactant that forms a bilayer on the ferrous surfaces in the medium. Highly quaternized pyridine salt compositions useful in such method and a method for preparation of such compositions are also disclosed.

Abstract: A corrosion protecting film layer is formed on a non-passivating non-noble metal, such as cobalt, by placing the metal in a dilute solution of Cu.sup.+2 ions and benzotriazole (1 H-BTA). Exposure of the metal to a solution containing Cu.sup.+2 and 1 H-BTA results in a spontaneous interaction of Cu.sup.+2 and the metal to produce a film layer of Cu(I) BTA on the metal surface to create a permanent corrosion protection for the metal. A borate buffer, such as boric acid and a borate, can be added to the solution to adjust the pH of the solution to be in the range between 8 and 9.

Abstract: There is disclosed an improved corrosion inhibitor system including an oxazoline for an intermediate heat transfer medium for an indirect cooling heat transfer assembly and introduced in an amount of from 100 to 15,000 ppm to one part of the medium.

Abstract: A process for preparing a printed circuit board. The process involves successive steps of coating a photosensitive electrodeposition coating composition onto a printed-circuit copper-clad, laminated base plate to form a photosensitive resist film, applying a pattern mask onto the photosensitive resist film, exposing to an active light, developing and etching. Also the printed-circuit copper-clad, laminated base plate is subjected to a corrosion preventing treatment after cladding or laminating and prior to the step of coating the electrodeposition coating composition thereonto with a nitrogen-containing heterocyclic compound as a corrosion inhibitor.

Abstract: 1.3-imidazole prevents the corrosion of metal surfaces in contact with boiler waters and the condensates produced from these waters.

Abstract: A method for the inhibition and removal Of ammonium chloride deposition in hydrocarbon processing units comprising adding to the hydrocarbon liquid an amide selected from the group consisting of dimethylformamide and 1,3-dimethyl-2-thiourea.

Abstract: An organic salt, 2,4 Diamino-6-mercapto pyrimidine sulfate, has been combined with oxysalts of group VB or IVB of the periodic table to provide inorganic/organic inhibitor formulations having excellent corrosion resistant characteristics.

Abstract: The present invention relates to a stabilized composition containing a polyol/melamine and an effective stabilizing amount of an amine terminated polyether.

Abstract: Coating composition comprising:A) an organic film-forming binder; andB) a corrosion-inhibiting amount of a water-insoluble salt of i) a carboxylic acid having the formula (I): ##STR1## and ii) a base selected from a) a cation of Group Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, VIa, VIIa or VIIIa of the Periodic Table of Elements, b) an amine of formula II: ##STR2## c) a guanidine of formula III:R.sub.7 --N.dbd.C(NH.sub.2).sub.2 IIId) an amidine of formula IV:R.sub.7 --C(.dbd.NH)NH.sub.2 IVor e) melamine.

Abstract: The rust inhibiting and demulsibility performance of a lubricating oil can be synergistically enhanced by incorporating a rust inhibitor having at least one COOH acid group and a particular class of pyridine derivatives.

Abstract: A paint or varnish composition is described which comprises a medium, such as an alkyd resin, and an anticorrosion agent which is environmentally non-hazardous and soluble or adapted to be soluble in the medium. The composition is suitable for application to a metal substrate and the anticorrosion agent is selected so as to enable a dry paint or varnish film to be obtained on the metal substrate, preferably within 24 hours from the time of application.

Abstract: Aqueous aldehyde solutions for trapping hydrogen sulfide comprising 5 to 50% by weight of an aldehyde and 1 to 5% by weight, relative to the aldehyde solution of a formulation comprisinga) 10 to 80% by weight of a long-chain quaternary ammonium compound and 20 to 90% by weight of water or of a C.sub.1 -C.sub.4 -alcohol,b) 10 to 80% by weight of a condensation product of a C.sub.12 -C.sub.18 -fatty acid with a polyethylene polyamine of the formulaNH.sub.2 --(C.sub.2 H.sub.4 --NH).sub.x --C.sub.2 H.sub.4 --NH.sub.2in which x is 1, 2 or 3 and the molar ratio of fatty acid to basic nitrogen in the polyethylene polyamine is 3:1 to 3:2, and 20 to 90% by weight of water or of a C.sub.1 -C.sub.4 -alcohol, orc) 50 to 95% by weight of the fatty acid-polyethylene polyamine condensation product as defined in b) and 5 to 50% by weight of a nonionic or anionic surfactant.

Abstract: An alkoxybenzotriazole, in combination with mercaptobenzothiazole, tolyltriazole, benzotriazole, a substituted benzotriazole and/or 1-phenyl-5-mercaptotetrazole, is used to inhibit the corrosion of metallic surfaces, particularly copper surfaces, in contact with an aqueous system. Systems and compositions are also claimed.

Abstract: Corrosion resistance of metals such as aluminum is promoted by contact with a formulation containing a solution of an acrylic polymer; a blocked water-soluble zirconium or zinc catalyst; a mixture of water and an organic solvent; and a corrosion additive component.

Abstract: A lubricating oil, grease or fuel composition contains an antioxidant amount of a Mannich base reaction product of an N-hydrocarbyl-substituted-phenylenediamine or an N,N'-dihydrocarbyl-substituted phenylenediamine such as N,N'-di-sec-butyl-para-phenylenediamine, an aldehyde or ketone and a hindered phenol such as 2,6-di-tert-butylphenol.

Abstract: Methods are provided for simultaneously inhibiting the corrosion of iron-containing and copper-containing metals in contact with boiler feedwaters. The methods comprise adding an effective amount of 1,10-phenanthroline to the boiler feedwater system for which corrosion inhibition is desired.

Abstract: A corrosion inhibitor treatment composition for cooling water systems at elevated temperatures in which no chromate is used is disclosed, comprising a combination of a localized corrosion inhibitor in the form of a salt of molybdenum, vanadium, or tungsten, a reduced level of a general corrosion and scale inhibitor comprising zinc, nickel or a combination thereof, orthophosphate, an organic phosphonate, and a stabilizing agent.

Abstract: Mixtures of block alkoxy co- or terpolymer hydrocarboxylates and aminopolyazole increase the oxidation and corrosion resistance of lubricants, particularly diesel engine oil.

Abstract: A water treatment agent for boilers which comprises as active ingredients a compound which can release aliphatic hydroxycarboxylic acid ions in water and a polyamine represented by the following formula (I) or an acid addition product thereof:H.sub.2 H(CH.sub.2 CH.sub.2 NH).sub.n H (I)(wherein n denotes an integer of 2 to 5), and a water treatment method for pure water boilers or soft boilers using the above active ingredients to prevent corrosion of the ferrous metal in the water system of the pure water boilers or soft water boilers.

Abstract: New oxygen scavengers for boiler waters have been discovered, which oxygen scavengers are based upon N,N,N',N'-tetra substituted phenylenediamines. These compounds provide oxygen scavenging capabilities, metal passivating capabilities, volatility such that condensate systems in an operating boiler are protected, and may be formulated with other oxygen scavengers and other common treatment agents used in boiler waters.The preferred tetra substituted phenylenediamines are N,N,N',N'-tetramethyl-1,4-phenylenediamines, or its precursors.

Abstract: Quartenized derivatives of oligoquinoline have been reacted with refractory metal oxysalts to generate oligoquinolinium metal oxide salts which provide excellent corrosion inhibition of iron based alloy articles in sulfur containing media.

Abstract: Polyether polyols and polyurethane foams are stabilized by including therein a liquid stabilizer composition of (a) 2,6-di-tert-butyl-4-sec-butylphenol, (b) a reaction product of diisobutylene, styrene and diphenylamine and (c) phenothiazine or C.sub.9-26 -alkyl substituted phenothiazone and wherein the ratio of the phenol to the reaction product is about 1:5 to 5:1 and the ratio of the mixture of components (a) and (b) to the phenothiazone compound is about 5.0:0.1 to 4.0:1.0. The stabilizer composition may further contain trihydrocarbyl phosphite to stabilize the color of same.

Abstract: The present invention relates to compositions for protecting metals which contain a mixture constituted by stearic acid, dicyclohexylamine, and an azole derivative, and more particularly to a composition containing from 0.8 to 1.4 g/l of 1-phenyl-5-mercaptotetrazole, and from 0.005 to 0.01 g/l of the mixture stearic acid:dicyclohexylamine in the molar ratio 1:1, in solution in water, as well as to the process for its preparation, and to methods for protecting metals using said compositions.

Abstract: Polyether polyols and polyurethane foams are stabilized by including therein a liquid stabilizer composition of (a) 2,6-di-tert-butyl-4-sec-butylphenol, (b) a reaction product of diisobutylene, styrene and diphenylamine and (c) phenothiazine or C.sub.9-26 -alkyl substituted phenothiazine and wherein the ratio of the phenol to the reaction product is about 1:5 to 5:1 and the ratio of the mixture of components (a) and (b) to the phenothiazine compound is about 5.0:0.1 to 4.0:1.0. The stabilizer composition may further contain trihydrocarbyl phosphite to stabilize the color of same.

Abstract: The present invention utilizes low volatility amines or alkanol amines to control caustic corrosion which can take place when a boiler system, treated with a coordinated phosphate/pH program, is "out of control".N-substituted hydroxyalkyl piperazines are also capable of mitigating caustic corrosion in coordinated phosphate/pH programs. Combinations of the compounds of the present invention and phosphate have also been shown to be efficacious at mitigating caustic corrosion in coordinated phosphate/pH programs.

Abstract: A composition and method for inhibiting the corrosion of steel containing greater than about 9% chromium in the presence of at least one mineral acid, especially at temperatures above 250.degree. F. The composition is made of a corrosion inhibitor selected from phenyl ketone, phenyl ketone with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound, or cinnamaldehyde with a quaternary salt of a nitrogen-containing heterocyclic aromatic compound and an acid soluble metal from antimonium or bismuth.

Abstract: The present invention provides an aqueous coating composition comprising:a) an aqueous electrodepositable film-forming binder; andb) as corrosion inhibitor, an effective amount of the reaction product of i) cinnamaldehyde and ii) an amine having the formula R--(CH.sub.2).sub.n --NH.sub.2 wherein R is C.sub.1 -C.sub.12 alkyl, C.sub.6 -C.sub.10 aryl, C.sub.5 -C.sub.8 cycloalkyl or --NH.sub.2, and n is O or an integer within the range of from 1 to 10.

Abstract: The present invention discloses a method of producing as aqueous agricultural composition exhibiting reduced irritation to animals and corrosiveness to materials by admixing an agriculturally acceptable pesticide and an amine-oxide surfactant having the Formula: ##STR1## wherein R.sup.1 is a straight or branched chain about C.sub.6 to about C.sub.20 alkyl or alkenyl group, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently selected from the group of straight and branched chain lower alkylenyl groups, and a+b+c+d is about 5 to about 25. The compositions exhibit reduced eye irritation to animals and reduced corrosiveness to metals. A method of treating plants is also disclosed.

Abstract: An aqueous alkaline cleaner and a process are described for reducing the discoloration of aluminum surfaces treated with are aqueous alkaline cleaner compositions. The process comprises including in the aqueous cleaner composition, an effective amount of at least one heterocyclic compound. Enhanced mobility of the aluminum surfaces also can be obtained when the heterocyclic compound is a solid particulate compound which is mixed with an oil prior to addition to the aqueous alkaline cleaner. In a preferred embodiment, the heterocyclic compounds are soluble pyrroles, imidazoles, pyrazoles, thiazoles or triazoles.

Abstract: New oxygen scavengers for boiler waters have been discovered, which oxygen scavengers are based upon N,N,N',N'-tetra substituted phenylenediamines. These compounds provide oxygen scavenging capabilities, metal passivating capabilities, volatility such that condensate systems in an operating boilder are protected, and may be formulated with other oxygen scavengers and other common treatment agents used in boiler waters.The preferred tetra substituted phenylenediamines are N,N,N', N'-tetramethyl-1,4-phenylenediamines, or its precursors.

Abstract: A novel method of injecting or squeezing a cross-linked scale inhibitor down a well into a subterranean formation which significantly lengthens its effective life is accomplished by cross-linking a carboxylic acid-containing polymeric or organophosphorus-containing inhibitor with a polyalcohol. The significant extension of life afforded by cross-linking with a polyalcohol improves the overall economics of oil production in fields prone to mineral scale.

Abstract: A method is provided for producing a corrosion resistant metallic article. The article to be protected is coated with a solution containing a polymeric composition drawn from the class of polymers commonly known as polybenzimidazoles, followed by drying or curing of the coated article. The coated metallic article resists corrosion under severe conditions. The coating adheres well, being non-peeling and resistant to organic solvents and heat.

Abstract: Carbohydrazide is an effective material for preventing hydrogen blistering and corrosion in the refinery overhead condensate systems of Fluid Catalytic Cracking Units.

Abstract: Hydrogen sulfide gas evolution from water or hydrocarbons, especially during storage or transport of petroleum residua is suppressed by the incorporation of an effective amount of a diamine of the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 are independently an alky radical containing 1 to 14 carbon atoms, (CH.sub.2).sub.n --OR.sub.6 or cycloalkyl containing 5 or 6 carbon atoms and R.sub.5 is hydrogen or methyl. R.sub.1 and R.sub.2 and R.sub.3 and R.sub.4 can be alkylene groups joined together with their respective adjacent N to form a heterocyclic ring. R.sub.6 is hydrogen or an alkyl radical having 1 to 5 carbon atoms and n is an integer of 1 to 5.

Abstract: A process for reducing the corrosiveness of aerated aqueous solutions, which comprises stripping the oxygen with gas containing hydrogen sulfide after addition of a composition which is both catalytic of the reduction of oxygen by hydrogen sulfide gas and inhibiting of hydrogen sulfide corrosion, such composition comprising certain metallic salts and a water-soluble oxyethylenated amine.