Method of preventing diffusion of N.sub.2, O.sub.2 or C in selected metal surfaces
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United States of America Patent
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May 24, 1988
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N/A
app pub date -
Oct 22, 1986
filing date -
Oct 22, 1986
priority date (Note) -
Expired
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Abstract
A method and composition for stopping-off nitrogen and/or carbon diffusion into metal surfaces. The composition, which is a mixture of a refractory material selected from the group of zirconium and aluminosilicate, sodium silicofluoride and sodium silicate, is coated onto the metal surface where diffusion is to be prevented. The mixture is cured and the metal part is subjected to elevated temperatures for carburizing, nitriding, or carbonitriding. The coating prevents nitrogen and/or carbon diffusion at the coated area. After treatment the coating is removed.
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