| 摘要 |
PURPOSE:To form a composite paint film having very high adhesion on Al having an oxide film by forming a paint film based on cationic resin paint on the Al under specified conditions, drying the film and applying fluororesin paint to the film. CONSTITUTION:The surface of Al or an Al alloy is cleaned and an oxide film is formed on the cleaned surface as usual. The Al is washed, dried and immersed in an aq. soln. of cationic resin paint such as epoxy resin paint at about 20-30 deg.C and electric current is supplied at about 80-300V voltage for about 0.5-5min to form a uniform paint film of 3-25mum thickness on the Al surface by electrophoretic coating. After the paint film is dried at 50-180 deg.C baking temp. for about 20-50min, fluororesin paint such as polytetrafluoroe thylene resin paint is applied to the film to about 25-40mum thickness by electro static coating or other method. Thus, coating ensuring superior weather resis tance can be carried out with high adhesion.
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