Hard chromium plating process for cobalt-chromium-tungsten alloy

Details Hard chromium plating process for cobalt-chromium-tungsten alloy Hard chromium plating process for cobalt-chromium-tungsten alloy

1981-06-04

1982-12-28

Douglas, Winston A.

Chemistry: electrical and wave energy

Processes and products

204 51, C25D 538

Patent

active

043660347

ABSTRACT:
This is a process for providing good adhesion of chromium electroplated onto a chromium and tungsten containing cobalt alloy (comprising 40-60% by weight cobalt, 19-25% chromium and 10-20% tungsten). Prior to electroplating, the cobalt alloy surface is etched with a 1-45% ferric solution for 1-200 minutes at 10.degree.-100.degree. C. Preferably, the surface is cleaned with an alkaline solution prior to etching and rinsed with cold water after etching.

REFERENCES:
patent: 2849348 (1958-08-01), Gray
patent: 2992171 (1961-07-01), MacLean
patent: 3328271 (1967-06-01), Kneip, Jr. et al.
patent: 3446715 (1969-05-01), Frey
patent: 3573120 (1971-03-01), Waldrop et al.

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