METHOD OF FORMING CORROSION RESISTANT FILM ON THE SURFACE OF SUBSTRATE COMPOSED OF COPPER OR COPPER ALLOY

摘要

A method for forming a corrosion resisting film on the surface of substrate composed of copper or copper alloy comprises coating a photosensitive soln. contg. a water-soluble high molecular cpd. and ammonium dichromate on the surface, and drying. The soln. Ph value is adjusted to be between 6.1 and 7.8. The watersoluble cpd. is pref. polyvinyl alcohol.