| 摘要 |
PURPOSE:To provide a compsn. for treating metallic surfaces which can provide high corrosion resistance and undercoatability for painting and excellent adhesion on the metallic surface by compounding respectively specified amts. of hydrolyzate of alkyl silicate, an ionic resin and a chromium compd. CONSTITUTION:A compsn. for treating metallic surfaces contains 0.5-250g hydrolyzate of alkyl silicate in terms of SiO2 in 1l of the compsn., 0.5-600g a cationic resin and amphoteric resin, and 0.05-50g a chromium compd., and contains these materials in total amt. not exceeding 700g. The resin in the compsn. is a water soluble or water dispersible resin having cationic nitrogen or said nitrogen and anionic carboxyl group and, for example, polyethylene imine or the like is used. The hydrolyzate, resin and chromium compd. of this compsn. act integrally, to form the film having excellent adhesion, water resistance, corrosion resistance and undercoatability for painting on the metallic surface. |
