Anodizing bath for composite metal material composed of aluminum or aluminum alloy and different metal having a lower ionization tendency

摘要

An electrolytic bath for a composite metal material composed of aluminum or aluminum alloy and metal different therefrom prepared by adding 0.3 to 12% by volume of hydrogen peroxide or 1 to 15% by weight of potassium ferricyanide to 0.1 to 4.0M aqueous solution of caustic soda.