BASE TREATMENT OF ALUMINUM OR ALUMINUM ALLOY MATERIAL FOR COATING AGAINST FILIFORM CORROSION

摘要

PURPOSE:To offer the base treatment for an aluminum or alluminum alloy material for coating used as a car body sheet material to prevent production of filiform corrosion. CONSTITUTION:This method for base treatment of an aluminum or alluminum alloy material to be coated against filiform corrosion features in that an anodized film is formed on the surface of aluminum or alluminum alloy material.