Process for the formation of protecting coatings on zinc surface

Details Process for the formation of protecting coatings on zinc surface Process for the formation of protecting coatings on zinc surface

1979-05-18

1981-01-06

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1136

Patent

active

042434963

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.

REFERENCES:
patent: 2125387 (1938-08-01), Mason
patent: 2132438 (1938-10-01), Romig
patent: 3011958 (1961-12-01), White
patent: 3898139 (1975-08-01), Watanabe et al.

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