Electrodeposition composition, process for providing a Zn/Si/P c

Details Electrodeposition composition, process for providing a Zn/Si/P c Electrodeposition composition, process for providing a Zn/Si/P c

1984-08-16

1985-08-06

Kaplan, G. L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

204 442, 420513, 428659, B32B 1504, C25D 356

Patent

active

045336067

ABSTRACT:
The present invention provides an aqueous composition and process for the electrodeposition of a layer of zinc containing silicon and phosphorus on a metal substrate. The electrodeposition composition is prepared by reacting metallic silicon and zinc with phosphoric acid and an alkali metal hydroxide in the ratio of between 0.4 and 1.3 moles of alkali metal hydroxide per mole of phosphoric acid, and adjusting the solution to a pH of 2 or higher after completion of the reaction. The coating is deposited on the metal substrate by electrodeposition and comprises about 70% to about 99.5% by weight of zinc, and about 0.10% to about 10% by weight of silicon, and about 0.5% to about 20% by weight of phosphorus.
The resultant zinc/silicon/phosphorus coating improves the resistance of the metal substrate to corrosion, wear, galling and stress corrosion cracking. While essentially all metals of industrial importance may be coated, this process is especially important for ferrous metals, steels, stainless steels, copper, aluminum and titanium. The coated metal substrates are useful in various industries, including appliance, automobile, oil field equipment, nuclear reactor equipment, aerospace equipment, etc.

REFERENCES:
patent: 4117088 (1978-09-01), Merkl

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