Multi-layer multi-metal electroplated protective coating

Details Multi-layer multi-metal electroplated protective coating Multi-layer multi-metal electroplated protective coating

1982-12-06

1983-11-29

Kaplan, G. L.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

204 40, 204 41, 428657, 428667, 428674, 428675, 428679, C25D 514, B32B 1501, B32B 1518

Patent

active

044181256

ABSTRACT:
This invention is directed to the formation of highly protective electroplated multi-metal coatings over an iron basis metal. The high degree of protection is obtained by the deposition of three sucessive layers of two dissimilar metal layers that form a galvanic cell in which one of the two adjacent metals is anodic to the other so that the corroding anodic electroplate will spread the attack laterally and thus prevent the corrosive media from drilling through to the base metal. The coating comprises an initial layer of sulfur free nickel followed in sucession by a sulfur containing bright nickel, cadmium, copper, sulfur free nickel, sulfur containing nickel and microporous chromium.

REFERENCES:
patent: 2124657 (1938-07-01), Ritzenthaler et al.
patent: 3090733 (1963-05-01), Brown
patent: 4154139 (1979-05-01), Hage

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