CHEMICAL CONVERSION TREATMENT AGENT FOR SURFACE TREATMENT OF METAL SUBSTRATE AND METHOD FOR SURFACE TREATMENT OF METAL SUBSTRATE USING THE SAME

摘要

This chemical conversion treatment agent for surface treatment of a metal substrate contains a co-condensate of a silane coupling agent (A), a silane coupling agent (B), the element fluorine, and at least one metal element selected from a group consisting of zirconium, titanium and hafnium. The silane coupling agent (A) has a tri- or di-alkoxysilane group and an amino group, and the silane coupling agent (B) is represented by general formula (1) [in the formula, R represents an alkylene group of 1-5 carbon atoms; Z represents a cyclohexyl group optionally having an epoxy group; a, b, and c are integers 0-3 fulfilling the conditions that the sum of a, b and c is 3 and the sum of a and b is 2-3; and x is an integer 1-3.].