Passivation

Details Passivation Passivation

1986-03-18

1988-10-11

Silverberg, Sam

Metal treatment

Compositions

Heat treating

C23C 2224

Patent

active

047768983

ABSTRACT:
A method of passivating a zinc-cobalt alloy, which alloy has a cobalt content of 0.1-2%, by contacting the alloy with an aqueous composition which has a pH of 0.5-2.5 and contains hexavalent chromium, hydrogen ions to provide the pH, chloride ions and sulfate ions and which may also contain nickel and/or cobalt ions.

REFERENCES:
patent: 1967715 (1934-07-01), Magruder
patent: 2288007 (1942-06-01), Lum
patent: 2357219 (1944-08-01), Mott
patent: 2502476 (1950-04-01), Ott
patent: 3130085 (1964-03-01), Otto
patent: 3405014 (1968-10-01), Kuwabara
patent: 3447972 (1969-06-01), Wilde
patent: 4591416 (1986-05-01), Kamitani

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