Formation of protective coatings by electrolytic codeposition of a nickel-cobalt matrix and ceramic particles
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United States of America Patent
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Oct 17, 1989
Grant Date -
N/A
app pub date -
Jun 30, 1988
filing date -
Jul 1, 1987
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Expired
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Abstract
Alloy steel or nickel based superalloy parts may be given protection against oxidation and frictional wear at temperatures below 600.degree. C. by means of a protective coating applied by electrolyte codeposition of a nickel-cobalt matrix comprising a uniform dispersion of ceramic particles selected from a group of carbides and oxides including SiC, Al.sub.2 O.sub.3, and Cr.sub.2 O.sub.3, the mass content of the ceramic particles being between 3.5% and 10%. The deposition is carried out in a sulfamate bath comprising a metallic salts content (Ni+Co) of from 70 g/l to 100 g/l, a Ni/Co mass ratio of from 5 to 33, and a mass content of the ceramic particles in suspension of from 50 g/l to 300 g/l.
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