| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a treatment liquid which stably forms a protective coating with uniform and adequate appearance and corrosion resistance on a zinc member, a zinc alloy member, a galvanized product or a zinc-alloy-plated product, without using hazardous hexavalent chromium, and to provide a method therefor. <P>SOLUTION: The treatment liquid for forming the hexavalent-chromium-free coating includes trivalent chromium, two or more anions selected from particular anions, three or more metallic ions selected from particular metallic ions, and one or more complexing agents selected from particular complexing agents. The method for forming the hexavalent-chromium-free coating includes contacting a substrate with the treatment liquid once or several times. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
