Process for the formation of protecting coatings on zinc surfaces
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United States of America Patent
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-
Jan 6, 1981
Grant Date -
N/A
app pub date -
May 18, 1979
filing date -
May 19, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to the protection of zinc surfaces by depositing a protecting coating. The process of the invention comprises the formation of a pyrophosphate coating by electrolytic oxidization of the articles treated in contact with a solution containing pyrophosphate ions or ions capable of giving pyrophosphates. The invention is particularly useful for protecting galvanized objects in contact with aqueous environments.
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