Multi-layer plating for improved corrosion resistance

Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...

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428648, 428657, 428659, 428666, 428668, B32B 1518

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active

041432100

ABSTRACT:
A multi-layer plating and method are provided for improved corrosion resistance of ferrous metal substrates and articles made therefrom. The multi-layer plating comprises a metallic coating comprising a layer of zinc or cadmium and a layer of tin, each of which are preferably between 0.00001 to 0.001 inches in thickness, followed by a layer, preferably between about 0.0001 to 0.000001 inches in thickness of either chromium or a metallic chromium substitute. The method comprises plating, and preferably electroplating, the aforementioned layers of metal over an article having ferrous metal base stock to obtain improved corrosion resistance.

REFERENCES:
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patent: 3245577 (1966-04-01), Virzi
patent: 3323881 (1967-06-01), Nelson et al.
patent: 3816082 (1974-06-01), Austin et al.
patent: 3857684 (1974-12-01), Kubu
patent: 3997301 (1976-12-01), Yoshihara et al.
patent: 4029556 (1977-06-01), Monaco et al.
"Electroplating Engineering Handbook", Graham, 1955, pp. 366-376.

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