| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated steel product that has a coating on the surface of a steel product and is chromium-free so as to be friendly to an environment while exhibiting excellent corrosion-resistant performance. SOLUTION: The coated steel product has a coating formed on the surface of the steel product via an inorganic film which includes a silicon oxide in the range of 5-100 mg/m<SP>2</SP>in terms of a silicon content and substantially does not include chromium and an organic material. Though the coated steel product substantially does not include hexavalent chromium and trivalent chromium at all, that is, being so-called chromium-free, it has excellent corrosion-resistant performance and is a material friendly to an environment. Consequently, it can be safely used in a wide range of applications. COPYRIGHT: (C)2009,JPO&INPIT |
