A treatment composition having anti-foulant and anti-corrosion properties is provided. The composition having a fatty amine and a diacid, where the diacid is a succinic acid or a linear saturated dicarboxylic acid having the formula: HO.sub.2C(CH.sub.2).sub.nCO.sub.2H where n is a positive integer of at least 6. A method for treating dilution steam generator system is also provided.

A corrosion inhibitor for nonferrous metals, comprising (i) a biochelant; (ii) a solvent; and (iii) at least one material selected from the group consisting essentially of a ring opener, an organic acid, a typical corrosion inhibitor, and a combination thereof. A method for reducing corrosion in a system comprising industrial water and a metal surface comprising introducing to the system a corrosion inhibitor composition comprising: (i) a biochelant; (ii) a solvent; and (iii) at least one material selected from the group consisting essentially of a ring opener, an organic acid, a typical corrosion inhibitor, and a combination thereof.

The present invention concerns a composition and method of using non-molybdate corrosion inhibitors in sterilizing and pasteurizing applications. The composition is a blend of one or more components including corrosion inhibitors, surfactants, hydrotropes, polymer dispersants, pH adjusting agents and water. The composition may include two or more of a) alkyl-dicarboxylic acid; b) phosphono-carboxylic acid; c) tri(amino-carboxylic acid); d) anionic polymer dispersant; e) non-ionic surfactant; f) inorganic phosphate; g) phosphonotricarboxylic acid; and h) hydrotrope. Specifically, the composition may comprise sebacic acid, hydroxyphosphonoacetic acid, and 6,6,6-(1,3,5-triazine-2,4,6-triyltriimino)tris-hexanoic acid. Optionally, the composition can further comprise a co-polymer of acrylic acid and allyl-2-hydroxy-propyl-sulfonate ether (AA/AHPSE), 2-phosphono-1,2,4-butane-tricarboxylic acid, sodium phosphate monobasic or phosphoric acid, -decyl--hydroxy-poly(oxy-1,2ethanediyl), and sodium cumenesulfonate. These components are not necessary, and in some embodiments, the composition is utilized without these components. The disclosed composition exhibits comparable or better corrosion protection performance than conventional molybdate containing sterilizing products.

The invention relates to an engine coolant composition, and a method of increasing the operational life of a coolant composition in an engine, wherein an isononanoic acid is incorporated into the generally glycol based coolant fluid in place of nitrous acid or its salt to reduce pitting corrosion on iron containing surfaces, and one or more hydroxybenzoic acids are incorporated.

Methods of treating aqueous systems with treatment compositions including non-triazole derivatives of imidazoline and/or amide compounds are provided that are effective to inhibit corrosion of corrodible metal surfaces in the aqueous systems. The non-triazole imidazoline and/or amide compounds show comparable or better corrosion inhibition as compared to conventional triazole corrosion inhibitors, and have low toxicity and good stability in the presence of halogens such as halogen-containing biocides or free chlorine.

The present invention provides a rust preventative for hypochlorous acid aqueous solution to impart a rust preventative effect to hypochlorous acid aqueous solution, wherein the rust preventative for hypochlorous acid aqueous solution is characterized in that a first active ingredient comprising a metal salt of a carboxylic acid containing 1-9 carbon atoms in the molecule and a second active ingredient comprising a compound having a triazole skeleton are contained in proportions such that the ratio mA/mB of the weight of the first active ingredient mA (mass parts) and the weight of the second active ingredient mB (mass parts) falls within the range of 0.05-200.

Methods and compositions for inhibiting corrosion in closed loop systems in which a heat transfer fluid is recirculated. A combination of a C6-C14 dicarboxylic acid and C6-C14 monocarboxylic acid is added to the recirculating fluid in a weight ratio of from 10:1 to 1:2.

A method for inhibiting corrosion of a corrodible metal surface that contacts a water stream in a geothermal well system. The method includes introducing into the water stream a corrosion inhibitor composition comprising: (i) a cationic surfactant, such as an imidazoline and/or a fatty amine ethoxylate, and (ii) an anionic surfactant.