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US 6,537,678 B1Granted
Non-carcinogenic corrosion inhibiting additive
AssigneeUnited Technologies Corporation
InventorsJohn William Putnam, Mark Jaworowski
Life of this patent
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Abstract
A non-carcinogenic corrosion inhibiting additive includes an anodic corrosion inhibitor and a cathodic corrosion inhibitor.
Claims21
A non-carcinogenic corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitor
- wherein the anodic corrosion inhibitor is a compound that is characterized by being soluble in alkaline media, while precipitating as a reduced, insoluble oxide under neutral and acidic reducing conditions, that is, existing as an insoluble oxide below −600 mv vs Ag/AgCl at pH 7, and below −300 mv vs Ag/AgCl at pH 2 and the cathodic corrosion inhibitor is a compound that is characterized by being soluble in acidic media, while undergoing a valance change to precipitate as an insoluble oxide under neutral and alkaline and moderately oxidizing conditions, that is, existing as an insoluble oxide above −300 mv vs Ag/AgCl at pH 7, and above −900 mv vs Ag/AgCl at pH 12.
A corrosion inhibiting solution comprising at least a carrier and a corrosion inhibiting additive according to any one of the preceeding claims.
Dependencies are inferred from the claim text.