Patent ID: 7935385
Filing Date: 2011-05-03
Classification: C23C,Y10T

Abstract:
1. A method for manufacturing metallic material having a chromium-oxide passivation film formed thereon, comprising the steps of: depositing a coating material consisting of chromium by a wet plating method onto a metallic material with a surface roughness (Ra) of not more than 1.5 μm; baking said chromium-coated metallic material formed by the wet plating method at a temperature of 100° C. to 200° C. in a high-purity inert gas atmosphere; and applying a heat treatment to said chromium-coated metallic material in an oxidizing atmosphere so as to form a chromium-oxide passivation film on said metallic material, said film having a depth and an outermost surface, and said film providing resistance to highly degradable and corrosive gases.