Corrosion inhibitor formulations for use in heat transfer fluids include: (a) an optionally substituted benzoic acid or a salt thereof; (b) at least a first n-alkyl monocarboxylic acid or a salt thereof and a second n-alkyl monocarboxylic acid or a salt thereof, the first n-alkyl monocarboxylic acid and the second n-alkyl monocarboxylic acid being different; and (c) an azole compound. A ratio of weight percent of the first n-alkyl monocarboxylic acid or the salt thereof to weight percent of the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.75 to about 1:2.00. A ratio of weight percent of the benzoic acid or the salt thereof to combined weight percent of the first n-alkyl monocarboxylic acid or the salt thereof and the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.30 to about 1:2.25.

Methods and compositions for inhibiting corrosion of a corrodible metal surface that contact a nitrogen-containing solution. The method comprises adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator. The organic filmer may be a hydroxycarboxylic acid. The chemical treatment composition may further include a surface-active compound.

The present invention relates to glycol based heat-transfer fluids exhibiting corrosion inhibition and comprising more than 5 wt. % (by total weight of the composition) of a glycol selected from the group consisting of monoethylene glycol, monopropylene glycol, 1,3-propanediol, glycerol or combinations thereof; and more than 1 wt. % (by total weight of the composition) of a short-chain organic carboxylic acid or salt thereof selected from the group consisting of C.sub.2 organic carboxylic acids or salts thereof, C.sub.3 organic carboxylic acids or salts thereof and combinations thereof; wherein the combined amount of the glycol and the short-chain organic carboxylic acid or salt thereof is more than 15 wt. % (by total weight of the composition). The invention further relates to concentrates for the preparation of said heat-transfer fluids, to methods for the preparation of said heat-transfer fluids, and to the methods and uses employing said heat-transfer fluids.

Corrosion inhibitor compositions for reducing the corrosive effect of acidic environments on metallic substrates are provided herein. In particular, the present disclosure describes corrosion inhibitor compositions comprising a condensation product of a trifunctional amine and a fatty acid. The present disclosure also describes methods of preparing and of using such corrosion inhibitor compositions.

Corrosion inhibitor formulations for use in heat transfer fluids include: (a) an optionally substituted benzoic acid or a salt thereof; (b) at least a first n-alkyl monocarboxylic acid or a salt thereof and a second n-alkyl monocarboxylic acid or a salt thereof, the first n-alkyl monocarboxylic acid and the second n-alkyl monocarboxylic acid being different; and (c) an azole compound. A ratio of weight percent of the first n-alkyl monocarboxylic acid or the salt thereof to weight percent of the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.75 to about 1:2.00. A ratio of weight percent of the benzoic acid or the salt thereof to combined weight percent of the first n-alkyl monocarboxylic acid or the salt thereof and the second n-alkyl monocarboxylic acid or the salt thereof ranges from about 1:0.30 to about 1:2.25.

A composition for inhibiting corrosion and/or removing hydrocarbonaceous deposits in oil and gas applications is provided. The composition comprises an iron sulfide dissolver, an organic solvent, and a corrosion inhibitor.

The present invention relates to the use of a corrosion inhibition composition for protection of metals and/or metallic surfaces from corrosion and a method for inhibition of corrosion of metallic surfaces using the corrosion inhibition composition.

A composition for inhibiting corrosion and/or removing hydrocarbonaceous deposits in oil and gas applications is provided. The composition comprises an iron sulfide dissolver, an organic solvent, and a corrosion inhibitor.

Methods of inhibiting corrosion in a benzene distillation or dryer unit are provided wherein alkenyl succinic acids or anhydrides (ASA) are brought into contact with metal surfaces thereby protecting the metal from an acidic corrosive medium flowing through the overhead. The benzene distillation column or drying tower may be utilized to purify benzene for subsequent feed of the purified benzene to an alkylation process such as in the alkylation of benzene by ethene to form ethylbenzene utilizing a zeolite alkylation catalyst.

The invention provides a water treatment composition comprising a cathodic inhibitor comprising at least one rare earth metal, an anodic inhibitor comprising at least one polycarboxylic acid, and a polymer dispersant comprising at least one sulfonic group. The invention also provides a method of inhibiting corrosion of a metal in an industrial water system, which method includes treating water of the industrial water system with the composition of the invention, to provide treated water.