Metal material having formed thereon chromium oxide passive film and method for producing the same, and parts contacting with fluid and system for supplying fluid and exhausting gas

An article, comprising:

• a metallic body having a surface, the metallic body surface having a surface roughness (Ra) being not more than 1.5 μm;
• and
• a chromium-oxide passivation film providing an outermost surface, the chromium oxide passivation film formed by coating directly onto the metallic material surface a chromium film having a thickness of at least 100 nm, baking the chromium film directly onto the metallic material surface at a temperature of 100° C. to 200° C. and heating the baked chromium film coated directly onto the metallic material surface in an oxidizing atmosphere, wherein,
• the chromium-oxide passivation film is substantially 100% chromium oxide approximately 30 nm from the outermost surface, and
• chromium of said baked chromium film which is not oxidized remains between the chromium-oxide passivation film and the metallic material, and the chromium remains adhered to the metallic material so that the chromium-oxide passivation film is coupled to the metallic material.

A structure, comprising:

• a metallic body having a surface, the metallic body surface having a surface roughness (Ra) being not more than 1.5 μm;
• and
• a chromium-oxide passivation film providing an outermost surface, the chromium oxide passivation film formed by coating directly onto the metallic material surface a chromium film having a thickness of at least 100 nm, baking the chromium film directly onto the metallic material surface at a temperature of 100° C. to 200° C. and heating the baked chromium film coated directly onto the metallic material surface in an oxidizing atmosphere, wherein,
• the metallic body surface defines a continuous boundary between the metallic body and the chromium-oxide deposit,
• the chromium-oxide passivation film is substantially 100% chromium oxide approximately 30 nm from the outermost surface, and
• chromium of said baked chromium film which is not oxidized remains between the chromium-oxide passivation film and the metallic material, and the chromium remains adhered to the metallic material so that the chromium-oxide passivation film is coupled to the metallic material.

A structure, comprising:

• a metallic material having a surface, the metallic surface having a surface roughness (Ra) being not more than 1.5 μm;
• and
• a chromium-oxide passivation film formed by coating directly onto the metallic material surface a chromium film having a thickness of at least 100 nm, baking the chromium film directly onto the metallic material surface at a temperature of 100° C. to 200° C. and heating the baked chromium film coated directly onto the metallic material surface in an oxidizing atmosphere, wherein,
• at least approximately 30 nm from an outermost surface of the chromium-oxide passivation film consisting of substantially 100% chromium-oxide, and
• chromium of said baked chromium film which is not oxidized remains between the chromium-oxide passivation film and the metallic material, and the chromium remains adhered to the metallic material so that the chromium-oxide passivation film is coupled to the metallic material.