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US 5,294,265 AGranted
Non-chrome passivation for metal substrates
AssigneePPG Industries, Inc.
InventorsRalph C. Gray, Michael J. Pawlik, Paul J. Prucnal, Christopher J. Baldy
Life of this patent
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Abstract
Aqueous acid solutions for treating metal surfaces such as aluminum and galvanized steel are disclosed. The solutions are mixtures of organophosphates or phosphonates and chloride or fluoride. The treating solutions can be used in place of chromium treating solutions.
Claims20
An aqueous acidic solution for treating metal surfaces comprising:
- a) a compound selected from the group consisting of epoxy esters of phosphoric acid, epoxy esters of a phosphonic acid and mixtures thereof,
- b) and a halide ion selected from the group consisting of fluoride and chloride.
Dependencies are inferred from the claim text.