Cr-FREE SURFACE TREATMENT COMPOSITION FOR IMPROVING CORROSION RESISTANCE OF GALVANIZED METAL AND SURFACE TREATMENT METHOD OF GALVANIZED METAL USING THE SAME

摘要

The present invention relates to a chromium-free surface treatment composition for improving corrosion resistance of a galvanized metal and a method of treating the surface of a galvanized metal using the same, wherein the surface treatment composition of the present invention is ethyl silicate, hydrochloric acid, ethanol, iso By including propyl alcohol, methoxysilane-based compounds and deionized water in a specific ratio, the adhesion to zinc plated metal is excellent without the use of chromium, while the blackening resistance, whitening resistance, corrosion resistance and rust resistance of zinc plated metal are remarkable. Can be improved.