Metal material having formed thereon chromium oxide passive film and method for producing the same, and parts contacting with fluid and system
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United States of America Patent
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app pub date -
Jul 30, 2007
filing date -
Jan 13, 1999
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Abandoned
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Abstract
The object of the present invention is to form a chromium-oxide film excellent in corrosion resistance without containing an oxide film of other metal onto the optional metallic material. The chromium-oxide passivation film excellent in corrosion resistance without containing the oxide film of other metal can be formed inexpensively and in a short time, and a fluid supplying system for supplying fluid hard in corrosivity in safety is able to be provided. This invention comprises a step of forming the passivation film consisting of a chromium oxide by giving heat treatment in an oxidizing atmosphere after coating chromium on metallic material of which surface roughness (Ra) of a coat surface is not more than 1.5 .mu.m
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