| 摘要 |
PURPOSE:To improve the stripping resistance and corrosion preventing performance of an org. coat by using an optimum total amount of Sb and Si based on the amount of Cr in an oxide layer contg. Cr formed as a base layer for the org. coat and by specifying the amount of the oxide layer stuck. CONSTITUTION:A chromate layer (oxide layer) having 0.1-2.0atom ratio of (Sb+Si)/Cr is formed on the blasted or cleaned surface of a steel material by 0.1-10g/m<2> on dry basis. A coat is then formed with an org. coating material such as polyethylene or epoxy resin. By this method, a steel material coated with an org. coat having superior corrosion preventing performance is obtd. The org. coat is proof against sprayed brine and has resistance to stripping in warm water and cathodic stripping.
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