Passivation
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United States of America Patent
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-
Oct 11, 1988
Grant Date -
N/A
app pub date -
Mar 18, 1986
filing date -
Mar 20, 1985
priority date (Note) -
Expired
status (Latency Note)
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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.
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