FORMATION OF COATING LAYER OF SELF-DEPOSITING POLYMER SUPPRESSING FORMATION OF PINHOLE ON ZINC-CONTAINING SURFACE AND COMPOSITION FOR PINHOLE PREVENTIVE TREATMENT

摘要

PURPOSE: To coat a zinc-contg. surface with a self-depositing polymer effective in controlling pinholes and swell. ;CONSTITUTION: A zinc-contg. solid surface is treated with an aq. compsn. contg. hydrofluoric acid and a pinhole preventive additive contg. acetoxyhydroximic acid, 2-, 3- or 4-aminobenzoic acid, boric acid, polyethyleneimine, 1- hydroxyethylidene-1,1-diphosphonic acid, aminotri(methylenephosphonic acid), diethylenetriaminepenta(methylenephosphonic acid), 2-thiophenecarboxylic acid, poly(vinylpyrrolidone), acetylacetonatopotassium or acetohydroximic acid. The treated surface is then coated using a self-depositing polymer bath.;COPYRIGHT: (C)1994,JPO&Japio