The present disclosure relates to agents, compositions, and methods for inhibiting corrosion in various substrates, for example in metal substrates. The present disclosure also relates to compositions for inhibiting corrosion comprising at least one organic heterocyclic compound and at least one metal salt or mixed metal salt selected from rare earth, alkali earth and transition metals.

Disclosed are compositions including one or more corrosion inhibitors, one or more solvents and one or more Log P additives. The compositions are useful as corrosion inhibitors for use in the petroleum industry wherein the compositions are stable, pumpable, and pourable at temperatures as low as 40 C. and as high as 60 C.

Corrosion inhibiting compositions and methods of inhibiting corrosion on a metal surface commonly used in the petroleum industry is disclosed. The corrosion inhibitor includes at least one azole, at least one polypeptide derived from amino acid, at least one intensifier preferably from metal halides, and at least one surfactant. The methods include combining effective amounts of the corrosion inhibitor composition and contacting a metal surface in aqueous environment commonly found in oil and gas industry. The composition is very effective against corrosion of metals in contact with aqueous media when used in a dosage as low as 50 ppm.

A method of inhibiting sour corrosion of a metal surface including contacting the metal surface and composition in a corrosive medium. The corrosive medium includes hydrogen sulfide. The composition includes an aliphatic alcohol comprising 1 to 6 carbons, a polysorbate, a glycol compound, and a substituted benzimidazole compound. The composition includes a weight ratio of the substituted benzimidazole compound to the polysorbate of 1 to 3.

Provided is a method for sealing an article with a non-chrome corrosion inhibitor seal. The method may include applying an aqueous-based suspension comprising a thiol-containing corrosion inhibitor on a surface of an anodized substrate.

The present disclosure is directed to methods, systems and apparatuses for predictively selecting plant extracts for their inclusion in formulations to imparting anti-corrosion properties to coatings for aluminum, aluminum alloys, copper and copper alloys.

A corrosion inhibitor additive is circulated in a system with a corrosion environment to inhibit metal corrosion. The corrosion inhibitor additive includes a first component and a second component. The second component includes without limitation, imidazolines, amides, quaternary amines, carboxylic acid reaction products, organophosphates, phenathradine derivatives, heterocyclic molecules containing one or both of nitrogen and sulfur, and combinations thereof. The first component may have one of the following formulas:

##STR00001##

wherein x is oxygen or hydrogenated nitrogen or quaternized nitrogen; R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, methyl or an alkyl group; p, q and n are independently integers from 1 to 100; and

SHCH.sub.2[CH.sub.2OCH.sub.2].sub.zCH.sub.2SH(A1)

where z is an integer ranging from 1 to 100; and where a lower amount of the corrosion inhibitor additive is used to achieve the same or better results in inhibiting the corrosion of the metal surface as compared to an otherwise identical method for inhibiting corrosion absent the corrosion inhibitor additive.

Provided are conducting members for fuel cells obtained by applying a protective film forming agent to a surface-treated base material having a base material and at least one alloy plating layer formed on the base material in order to form a protective film on the alloy plating layer, and thereafter subjecting the surface-treated base material to an acid treatment. In the conducting members for fuel cells of the present invention, the protective film forming agent preferably contains a mixture of a compound having a thiol group and an azole-based compound, and/or an azole-based compound having a thiol group. In the conducting members for fuel cells of the present invention, the acid treatment is preferably a treatment using sulfuric acid or nitric acid.

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.

Provided is a method for sealing an article with a non-chrome corrosion inhibitor seal. The method may include applying an aqueous-based suspension comprising a thiol-containing corrosion inhibitor on a surface of an anodized substrate.