| 摘要 |
PURPOSE:To improve water wettability and corrosion resistance by providing an oxide film formed by an anodization method on the surface of a titled member and packing a Zn-Si compd. in the pores of the film. CONSTITUTION:Al or Al alloy member as an anode is electrolyzed in an aq. soln. of an oxalic acid, chromic acid, sulfuric acid, etc. to form an oxide film on the surface thereon. Pores having 100-500Angstrom diameter are numerously formed in the film. The member is then dipped in an aq. 5-10% sodium silicate soln. added with 1-5% pulverous powder of metallic zinc or zinc oxide powder to penetrate said metals in the pores of the oxide film. When the member is pulled up and is heated, a Zn-Si compd. is packed in the pores. The member is dipped, if necessary, in a chemical conversion liquid contg. chromate or dichromate to adsorb and fix the chromate or dichromate on the Zn-Si compd. |
