Biodegradable corrosion inhibitors of low toxicity
OwnerRichard L. Martin, Jo Ann McMahon +1inventors
InventorsRichard L. Martin, Jo Ann McMahon, Bernardus A. Oude Alink
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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.
Claims17
A method for inhibiting corrosion in an aqueous medium containing Skeletonema costatum, fish, algae or a combination thereof, the method comprising incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion, the corrosion inhibitor comprising 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, and a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons.
A water-soluble, biodegradable corrosion inhibitor composition comprising (1) 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, (2) a phosphate ester derived from a water-soluble oxyethylated, straight chain alcohol of from about two to about thirty carbons, and (3) a solvent selected from the group consisting of water, ethylene glycol and propylene glycol.
A method for inhibiting corrosion in a non-sweet aqueous medium containing Skeletonema costatum, fish, algae or a combination thereof, the method comprising incorporating into the medium an amount of a water-soluble corrosion inhibitor sufficient to inhibit corrosion, the corrosion inhibitor comprising 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.
Dependencies are inferred from the claim text.