Method of treating ferrous surfaces subjected to high friction strains
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United States of America Patent
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May 19, 1998
Grant Date -
N/A
app pub date -
Feb 27, 1996
filing date -
Mar 1, 1995
priority date (Note) -
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Abstract
In a method of increasing the wear resistance and the corrosion resistancef opposed bearing surfaces of parts subjected to reciprocal friction, in particular when the product of the pressure distributed over the bearing surfaces by the relative speed of the latter exceeds 0.4 MPa.m/s, thermochemical diffusion of nitrogen is effected by nitriding or nitrocarburizing in a molten salt bath at a temperature of 570.degree. C..+-.15.degree. C. followed by an oxidizing or phosphating surface chemical reaction providing resistance to wet corrosion. The nitriding or nitrocarburizing molten salt bath is made up of alkaline carbonates and cyanates and further contains sulfur-containing substances in the following percentages by weight: 30%
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