Micro-throwing alloy undercoatings and method for improving corr

Details Micro-throwing alloy undercoatings and method for improving corr Micro-throwing alloy undercoatings and method for improving corr

1979-09-25

1982-05-11

Andrews, M. J.

Stock material or miscellaneous articles

All metal or with adjacent metals

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

204 43T, 427405, 428657, 428658, 428659, 428679, 428926, 428935, 411902, B32B 1518

Patent

active

043294022

ABSTRACT:
Novel micro-throwing alloy undercoatings, multi-layer coatings containing a novel micro-throwing alloy undercoating and method of improving the corrosion resistance of ferrous metal articles are provided in accordance with the invention. The novel micro-throwing alloy undercoatings are applied as an initial layer over ferrous metal and comprise a layer of alloy having micro-throwing power, such as nickel-cadmium, nickel-zinc, iron-cadmium, iron-zinc, cobalt-cadmium, cobalt-zinc or a ternary or quaternary alloy containing iron, nickel or cobalt in combination with cadmium or zinc. The method comprises application, preferably by electroplating, of a layer of novel micro-throwing alloy undercoating directly over ferrous metal, optionally followed by one or more layers of metallic or organic coatings which further contribute to improved corrosion resistance.

REFERENCES:
patent: 2809156 (1957-10-01), Safranek
patent: 2832729 (1958-04-01), Safranek
patent: 2840517 (1958-06-01), Faust
patent: 4188459 (1980-02-01), Hyner
Leffler et al., Plating, vol. 44 TS670A3, pp. 388-396, Apr. 1957.
Lowenheim, Modern Electroplating, TS670E46, Wiley, 2nd Ed., Mar. 1964, pp. 28-29.

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