Abstract: A composition for inhibiting corrosion. The composition contains a mixture of a dessicant and a vapor-corrosion inhibitor. The mixture of dessicant and inhibitor is synergistic: the service life of the corrosion inhibitor is signficiantly longer when so used than when used alone or in in the presence of but not physically mixed with the dessicant.

Abstract: A method of extracting corrosion inhibiting constituents from tobacco comprises the steps of soaking tobacco in an aqueous solution under certain extraction conditions, followed by filtration to remove tobacco residue from the resultant aqueous tobacco solution. This tobacco solution is used as a corrosion inhibitor to minimize the amount of corrosion occurring at galvanic corrosion cells that are established at areas of union of metals having different electrochemical potentials.

Abstract: The process of providing functional fluids with at least one of corrosion inhibiting ability or defoaming properties, including adding to a functional fluid a triethanolamine product mixture containing a major part (at least 50%, preferably from 60-90%) by weight of at least one triethanolamine; a minor part (preferably from 10-40%) by weight of diethanolmono-C.sub.3-4 -alkanolamine and monoethanoldi-C.sub.3-4 -alkanolamine; and less than 1% by weight of a mixture of diethanolamine and monoethanolamine. Preferably the functional fluid is an aqueous metal working fluid.

Abstract: Amines which are compounds of the formula I: ##STR1## where R is a C.sub.6-20 hydrocarbon;X is --NR.sub.1 -- or --O--;each R.sub.1 is independently H or --[(CH.sub.2).sub.1-4 ]COOH or a C.sub.6-20 hydrocarbon;n is 1, 2 or 3;and which contains at least one (CH.sub.2).sub.1-4 COOH group; or salt thereof are useful in inhibiting corrosion of metals in a marine or freshwater environment e.g. in oil- and gas-field applications since they show relatively low toxicity to marine organisms.

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: An aqueous stripping composition comprising a mixture of about 55% to 70% by weight of monoethanolamine, about 22.5 to 15% by weight of hydroxylamine and water. The stripping composition is effective to strip photoresists, residues from plasma process generated, organic, metal-organic materials, inorganic salts, oxides, hydroxides or complexes in combination with or exclusive of organic photoresist films at low temperatures without redepositing any substantial amount of metal ions.

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: A method for inhibiting corrosion in an aqueous medium is disclosed. The method comprises incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion. The corrosion inhibitor comprises an N-ethoxy,2-substituted imidazoline, the N-ethoxy substituent having from one to about thirty ethoxy units and the 2-substituent being an unsaturated or polyunsaturated fatty chain of from about six to about thirty carbons. If the medium is sweet, the inhibitor further comprises a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons. Corrosion inhibitor compositions useful in such method are also disclosed.

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: Substituted succinimides of formula (I) ##STR1## in which R represents an alkyl radical containing 5 to 15 carbon atoms and R.sub.1 represents an oxo-2 morpholino radical or a (carboxymethyl)(hydroxy-2 ethyl) amino radical and their salts, and use for obtaining concentrates intended for metal-working, particularly for combatting corrosion.

Abstract: A corrosion control composition and method for boiler/condensate steam systems is provided. Corrosion is controlled by the addition to the feedwater of a relatively high molecular weight amine. The high molecular weight amine is formulated so that at the conditions of temperature and pressure in the boiler/condensate steam system, partial degradation into more volatile amines occurs. The resulting blend of neutralizing amines provides the superior corrosion control of a blend of neutralizing amines from a single amine feed. The preferred high molecular weight amine is dimethylaminopropylamine which will partially degrade into dimethylamine, trimethylamine, methylamine, and dimethylaminopropanol.

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: Methods of using a mixture as a corrosion inhibitor, moisture or formaldehyde scavenger, reactive diluent, rheological modifier, thermoplastic foam inhibitor, antifreezing agent, decolorizing agent, or drying agent. The mixture consists of from 0 to 100 mole percent of an iminoalcohol compound: ##STR1## wherein: R.sub.1 is a methyl or methylol group, an ethyl or ethylol group, a branched or straight chain alkyl or alkanol group, a cycloalkyl group, or an aryl group; R.sub.2 is a hydrogen atom, a methyl or methylol group, an ethyl or ethylol group, a straight chain or branched chain alkyl or alkanol group, a cycloalkyl group, or an aryl group, or R.sub.1 and R.sub.2 are fused together with the attached carbon to form a cycloalkane ring; R.sub.3, R.sub.4 and R.sub.5 are, individually, a hydrogen atom, a methyl or methylol group, an ethyl or ethylol group, or a straight chain or branched chain alkyl or alkanol group; R.sub.

Abstract: This invention is a method for inhibiting corrosion in metallic flow lines containing hydrocarbon and/or aqueous fluids comprising adding to the fluid contained in the flow line a corrosion inhibiting amount of a water-soluble ampholytic substituted imidazoline having the formula: ##STR1## wherein R1 comprises a radical selected from the group consisting of hydrogen, alkyl, and aryl groups having 6 to 30 carbons; R2 comprises a radical selected from the group consisting of polyalkylene polyamines having from 2 to 16 carbon atoms, NH.sub.2, N(R.sub.4).sub.2, OH and SH; R.sub.3 is a radical selected from the group consisting of carboxylate, carbonate, sulfite, sulfate, phosphite, and phosphate; n is a number from 1 to 10; and, R4 comprises a branched or linear alkyl chain having a length of 1 to 8.

Abstract: A method of inhibiting corrosion of iron and steel alloys in contact with industrial waters is claimed. The method comprises treating said waters with an effective corrosion inhibiting amount of a water soluble polymer having an average molecular weight ranging from about 2,000 to about 50,000, said polymer containing at least four mole percent of a hydroxamic acid mer unit.

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 method for neutralizing acidic species and inhibiting the deposition of amine acid salts on the internal surfaces of elevated temperature processing units in a petroleum refinery comprising adding to the hydrocarbon liquid being processed therein a tertiary amine, including trimethylamine and triethylamine.

Abstract: A coating composition comprising a) an organic film-forming binder; and b) a corrosion-inhibiting amount of a substantially water-insoluble mono- or poly-basic salt of:i) a ketoacid having the formula I: ##STR1## in which m and n, independently, are 0 or an integer from 1 to 10 provided that the sum of m and n is at least 1; A is C.sub.1 -C.sub.15 alkyl, C.sub.2 -C.sub.15 alkenyl, optionally substituted C.sub.3 -C.sub.12 cycloalkyl, C.sub.2 -C.sub.15 alkyl interrupted by one or more O-, N- or S-atoms, optionally substituted C.sub.6 -C.sub.10 aryl, optionally substituted C.sub.7 -C.sub.12 aralkyl, optionally substituted C.sub.7 -C.sub.12 aralkenyl, a heterocyclic residue or a ferrocenyl residue; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and each is a substituent A, hydrogen, OH, O-C.sub.1 -C.sub.15 alkyl, NH.sub.2, NH(C.sub.1 -C.sub.15 alkyl), N(C.sub.1 -C.sub.15 alkyl).sub.2, CO.sub.2 H, CO.sub.2 (C.sub.1 -C.sub.15 alkyl), SO.sub.3 H, P(O) (OH).sub.2 P(O)(OH)(O-C.sub.1 -C.sub.

Abstract: A method of corrosion inhibition using a gelled inhibitor is disclosed. The method comprises consecutively introducing into an annular region of a jacketed pipeline a hydrogel slurried in an environmentally innocuous oil medium and a corrosion inhibitor dissolved in an aqueous medium. The liquid media are contacted to form a gelled corrosion inhibitor in the annulus. The method is particularly useful in buried pipelines where corrosion monitoring is difficult.

Abstract: A composition of polyalkylenepolyamine derivatives useful as a corrosion inhibitor in aqueous media produced by reacting a starting polyalkylenepolyamine composition comprising a mixture of:(i) at least one C-alkyl-ethylene diamine; and(ii) at least one di-(C-alkyl)-diethylenetriamine;wherein each C-alkyl group on the ethylene diamine and diethylenetriamine independently contain between 8-26 carbon atoms;with a derivatizing agent which is either an alkylating agent or an alkylene oxide. Methods for preparing this composition and using it to inhibit the corrosion of corrodible metal alloys are also disclosed.

Abstract: Methods are provided for inhibiting the corrosion of iron and iron-containing metals in contact with aqueous systems. Salicylaldoxime is added to cooling water systems to inhibit the corrosion of these metal surfaces.

Abstract: The invention is directed generally to controlling corrosion in boiler systems and more particularly to treating boiler water to remove dissolved oxygen and to passivate metal surfaces.

Abstract: Corrosion inhibition in polyol ester lubricant compositions is achieved by the inclusion in the lubricant of a mixture of a hydroxyamine (e.g., bis(2-hydroxyethyltallowamine) and an alkyldiamine dicarboxylate (e.g., N-tallow-1,3-diaminopropane dioleate).

Abstract: An ammonium salt of an alkenylsuccinic half-amide of formula (I) below ##STR1## in which R.sup.1 denotes H or a C.sub.6 -C.sub.18 -alkenyl radical, provided that the radicals R.sup.1 are not both H or both C.sub.6 -C.sub.18 -alkenyl,X denotes a group of the formula --NHR.sup.2 or --NR.sup.2 R.sup.3, in whichR.sup.2 and R.sup.3 denote C.sub.1 -C.sub.6 -alkyl, cycloalkyl or a heterocyclic ring attached to the nitrogen atom via an alkylene chain,andA denotes XH or a different primary, secondary, or tertiary amine, for example an alkanolamine or a polyamine,and the use thereof as a corrosion inhibitor in oil and/or gas production technology.

Abstract: The straight-chain terminal olefinic hydrocarbon n-decene-1 and compositions containing n-decene-1 are effective in the treatment of minor localized skin infections, inflammatory skin conditions and soreness when applied topically to the skin. Typically, the product comprises from about 5 to 100 volume percent of pure n-decene-1. However, mixtures of n-decene-1 with inert solvents or fillers for use in lotions, creams, gels and sprays can also be used.

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: 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: 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: A rust and corrosion preventive hydrous fluid comprising (a) 0.01% or more by weight of a rust and corrosion preventive compound of the following formula: ##STR1## wherein n is an integer of 3 to 300, each R.sup.1 is an alkylene group of 2 to 4 carbon atoms, an arylene group of 6 to 30 carbon atoms or a cycloalkylene group of 6 to 30 carbon atoms, with the proviso that the R.sup.1 groups are identical with or different from one another, and R.sup.2 is a hydrogen atom, an alkyl group of from 1 to 30 carbon atoms, an aryl group of from 6 to 30 carbon atoms or a cycloalkyl group of from 6 to 30 carbon atoms, and (b) water.

Abstract: The deposition of elemental sulfur in a conduit through which a sulfur containing gas is flowing is reduced by providing, as a novel sulfur dispersant, an ether alcohol component produced from primary alcohol and epichlorohydrin mixed with an aliphatic amine component, the dispersant being employed in the presence of liquid water. When the conduit is normally vulnerable to the corrosion caused by contact with the sulfur-containing gas, the sulfur dispersant is optionally employed in conjunction with a corrosion inhibitor.

Abstract: The use of alkoxybenzotriazoles to inhibit the corrosion of metallic surfaces in contact with an aqueous system. Systems and compositions containing alkoxybenzotriazole are also claimed.

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: The present invention provides a method and compositions useful for inhibiting corrosion of a corrodible metal resulting from contact of water and air with the metal. In this method, a stannous salt and a hydrocarbyl substituted succinimide of a polyethylene polyamine are added to the water in minor amounts and cooperatively reduce corrosion of the metal to a substantially zero rate. While the amount of each agent for an effective inhibition is minor, say in the range of from about 0.1 to 100 ppm, a relatively concentrated solution is required for addition to the water. Suitable solvent media include the lower alkanols and mixture thereof with or without added water. Isopropanol is preferred. The solvent component of the compositions also varies depending upon the particular imide and/or salt component employed and the concentration desired.

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 composition and method for inhibiting corrosion of ferrous metals in contact with an aqueous solution comprising adding to the system from 0.1 to 500 ppm of an aminohydroxysuccinic acid compound selected from group consisting of compounds of the generalized formulas: ##STR1## wherein R is H or C.sub.1 to C.sub.6 alkyl, optionally substituted with --OH, --CO.sub.2 H, --SO.sub.3 H or phenyl, C.sub.4 C.sub.7 cycloalkyl, or phenyl which is optionally substituted with --OH, or --CO.sub.2 H, and R' is H, C.sub.1 to C.sub.6 alkyl, optionally substituted with --OH or CO.sub.2 H; and ##STR2## wherein R' is as above, and Z is selected from the group consisting of i) --(CH.sub.2).sub.n -- wherein n is an integer from 2 to 10, ii) --(CH.sub.2).sub.2 --X--(CH.sub.2).sub.2 -- wherein X is --O--, --S--, --NR"--; wherein R" is selected from the group consisting of H, C.sub.1 to C.sub.6 alkyl, hydroxyalkyl, carboxyallkyl, acyl, --C(O)OR"' wherein R"' is C.sub.1 C.sub.

Abstract: The present invention provides coating compositions comprisinga) an organic film-forming binder; andb) a corrosion-inhibiting amount of a salt ofi) a ketoacid having the formula (I): ##STR1## wherein a is 1,2,3,4 or 5; the R substituents are the same or different and each is hydrogen; halogen; nitro; cyano; CF.sub.3 ; C.sub.1 -C.sub.15 alkyl; C.sub.5 -C.sub.12 cycloalkyl; C.sub.2 -C.sub.15 alkenyl; C.sub.1 -C.sub.12 halogenoalkyl; C.sub.1 -C.sub.12 alkoxy; C.sub.1 -C.sub.12 thioalkyl; C.sub.6 -C.sub.12 aryl; C.sub.6 -C.sub.10 aryloxy; C.sub.7 -C.sub.12 alkaryl; --CO.sub.2 R.sub.1 in which R.sub.1 is a) hydrogen, b) C.sub.1 -C.sub.20 alkyl optionally interrupted by one or more O-, N- or S-atoms, c) C.sub.7 -C.sub.12 alkaryl or d) C.sub.6 -C.sub.12 aryl optionally substituted with one or more carboxy groups; --COR.sub.1 in which R.sub.1 has its previous significance; NR.sub.2 R.sub.3 in which R.sub.2 and R.sub.3 are the same or different and each is hydrogen or C.sub.1 -C.sub.

Abstract: The invention provides a composition comprising:(A) at least one dicarboxylic acid or anhydride or at least one ammonium or metal salt of the dicarboxylic acid or anhydride; and(B) at least one compound represented by the formula ##STR1## wherein R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently hydrogen, alkyl, hydroxyalkyl, polyhydroxyalkyl, polyalkoxyalkyl or hydroxypolyalkoxyalkyl; and R.sub.1 is a hydrocarbyl group. In another embodiment, the compositions include (C) at least one acid, or ammonium or metal salt of the acid represented by the formula: ##STR2## wherein R.sub.6, R.sub.7, R.sub.8 and R.sub.9 are each independently hydrogen or hydrocarbyl groups; and n is a number from 1 to about 10;(D) at least one ester-salt derived from at least alkyl or alkenyl succinic acid or anhydride of about 8 to about 28 carbon atoms and at least one alkanol amine;or mixtures of (C) and (D).The invention further provides for concentrates and functional fluids containing the above corrosion-inhibitors.

Abstract: There is disclosed a method for removing dissolved oxygen from aqueous systems, for example, boiler water systems for oil injection water or brine. The disclosed method uses a salt of a keto-gluconic acid, or a salt of a stereoisomer of a keto-gluconic acid, as the oxygen scavenger a metal containing compound which controls the rate of oxygen removal.

Abstract: A composition and method of inhibiting corrosion in boiler-steam condensate systems comprising adding to the system N,N-dihydrocarbylhydroxylamine and N-hydrocarbylhydroxylamine in amounts effective to inhibit corrosion.

Abstract: Disclosed are compositions comprising the reaction product of maleic anhydride and at least one alkenylsuccinic anhydride. These compositions when hydrolyzed and neutralized are useful in not only imparting corrosion resistance to ferrous metal surfaces in contact with aqueous systems but also retard or prevent precipitation of alkaline earth salts of organic acids from the aqueous system.

Abstract: The present invention provides a composition in contact with a corrodable metal surface, comprising a functional fluid and, as corrosion inhibitor, a compound having the formula 1A ##STR1## as well as salts or esters thereof, wherein R.sup.3 is C.sub.9 -C.sub.20 linear or branched alkyl, phenyl or C.sub.7 -C.sub.20 alkylphenyl;R.sup.4 is C.sub.1 -C.sub.3 alkyl;X is CH.sub.2, O or S;Y is O or S; andZ is--(CH.sub.2).sub.n -in which n is 1,2,3,4 or 5, or Z is--CH.sub.2 --CH(CH.sub.3)-.

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: A corrosion inhibitor with excellent film forming and film persistency characteristics may be produced by first reacting in a condensation reaction a polybasic acid with a polyalcohol to form a partial ester. The partial ester is reacted with imidazoline and/or fatty diamines to salt the ester. If warranted, the salted partial ester may be reacted with a metal hydroxide, a metal oxide, and/or ammonia to further salt the ester. Surfactants may be added to tailor the inhibitor formulation to meet the specific needs of the user (i.e., the corrosion inhibitor may be formulated to produce an oil-soluble, highly water-dispersible corrosion inhibitor or an oil-dispersible, water-soluble corrosion inhibitor). Suitable carrier solvents may be employed where needed to effectively disperse the corrosion inhibitor formulation.

Abstract: The corrosion and fouling of metal surfaces in contact with corrosive acid fluids or acid salts in the presence of an aqueous medium is reduced by contacting the surfaces with a composition which comprises (a) an anti-fouling amount of a hydroxyl amine compound of the formulaR.sub.1 R.sub.2 N--OHwherein R.sub.1 and R.sub.2 are independently hydrogen or a hydrocarbyl or inertly substituted hydrocarbyl or both R.sub.1 and R.sub.2 are collectively a divalent hydrocarbyl combined with said nitrogen to form a heterocyclic ring, and (b) a corrosion-inhibiting amount of a reaction product of or a mixture for the purpose of a reaction product of a polyalkylene polyamine and an alkynediol. The polyalkylene polyamine is one that contains from 2-10 amine groups, each separated from another by an alkylene group having from 2-6 carbon atoms. The alkynediol has from 2 to 6 carbon atoms.

Abstract: The present invention is directed to a method of inhibiting corrosion in aqueous systems which employ amino acid chelants in concentrations which are corrosive to the metal surfaces in contact with the aqueous system. The method comprises adding to the system a corrosion inhibiting amount of 1-hydroxyethane-1,1-diphosphonic acid (HEDPA). The corrosion inhibiting amount is generally in the range of from 0.5% to 10% on the basis of the concentration of amino acid chelant in the system.

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: 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: 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 comprising10 to 80% by weight of an ester of oxalkylated alkylalkylenediamines, which may be quaternized and 20 to 90% by weight of water or of a C.sub.1 -C.sub.4 -alcohol.

Abstract: A method of inhibiting carbonate stress corrosion cracking is determined to involve the addition of certain treatment chemicals to refinery process streams containing at least 1 of the volatile chemicals, ammonia, carbon dioxide, hydrogen sulfide, hydrogen cyanide, and water. The treatment chemical is preferably a fatty imidazoline compound or fatty amides or fatty esters or mixtures thereof.The imidazoline compounds and the amide/esters are formed by reacting tall oil fatty acids, naphthenic acids, or mixtures thereof with essentially linear heterochemicals containing amine or alcohol functionality.