| 摘要 |
PURPOSE:To improve the adhesion of a paint film to an Al material by chromating the Al material, combining the chromated Al material with a steel material, and subjecting them to chemical conversion treatment. CONSTITUTION:When a film is formed on the body of an automobile or the like before coating, an Al material work is washed and chromated with a treating soln. contg. chromic acid. The chromated Al material work is combined with a steel material work and subjected to chemical conversion treatment with a soln. for chemical conversion treatment to form a zinc phosphate film. A paint film having high adhesion can be formed on the Al material. |
