| 摘要 |
PURPOSE:To apply coating excellent in wear resistance and a sliding property onto a member to be treated, by impregnating a ceramics spray-coating layer formed on the surface of the member to be treated with a water-soluble chromium compound, and then converting the chromium compound into chromium oxide to leave it in pores. CONSTITUTION:After the surface of a member to be treated, e.g. a cylinder liner, is degreased and blasted 1, ceramics is sprayed 2 onto said surface. Then, the spray coating layer is impregnated 3 with a chromium compound by immersing the member to be treated to which spray coating has been finished in an aqueous saturated chromium compound solution, application such as spraying or brushing, etc. An excess amount of the aqueous solution is removed after the impregnation, and the member to be treated is dried 4 and then baked 5 to decompose the chromium compound. Hence, chromium oxide is left in the pores of the spray-coating layer. Necessary steps out of the steps aforementioned are repeated to increase the amount of chromium oxide deposited in the pores, and then the surface of the member to be treated is ground 6 to obtain the surface roughness required.
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