Cleaning and passivating treatment for metals
AssigneeBetzDearborn Inc.
InventorsEdward A. Rodzewich, Barry P. Gunagan
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Abstract
A cleaning and passivating treatment for metals comprising an amphoteric surfactant which is a caprylic acid derivative of imidazoline compounds. The treatment is substantially free of amines, alkanolamines and phosphates. The preferred treatment includes small quantities of borate ions and molybdate ions. In addition a nonionic surfactant may be added as a foam control agent.
Claims6
A cleaning and passivating treatment solution for ferrous metal surface comprising an essentially amine, alkanol amine and phosphate free aqueous solution of (a) from about 0.05 to 5.0% by weight a caprylic acid derivative of imidazoline amphoteric surfactant, (b) a borate ion and (c) a molybdate ion wherein the ratio of imidazoline amphoteric surfactant to borate ion is from about 1:0.4 to 1:5 and the ratio of sodium molybdate to imidazoline amphoteric surfactant and borate ion is more than about 1:4.
A method of cleaning and passivating a ferrous metal surface comprising contacting the ferrous metal surface with an aqueous treatment solution comprising (a) from about 0.05 to 5.0% by weight a caprylic acid derivative of imidazoline amphoteric surfactant, (b) a borate ion, and (c) a molybdate ion wherein the ratio of imidazoline amphoteric surfactant to borate ion is from about 1:0.4 to 1:5 and the ratio of sodium molybdate to imidazoline amphoteric surfactant and borate ion is more than about 1:4.
Dependencies are inferred from the claim text.