CHEMICAL CONVERSION TREATING AGENT AND SURFACE TREATED METAL

摘要

It is an object of the invention to provide a chemical conversion treating agent containing no chromium and exhibiting high corrosion resistance and excellent stability. A chemical conversion treating agent comprising: zirconium; fluorine; (A) at least one compound selected from the group consisting of amino group-containing silane coupling agents, their hydrolyzed products, and their polymers; and (B) an amino group-containing water-borne phenol compound; wherein the content of zirconium in the chemical conversion treating agent is 25 to 2000 ppm on the metal equivalent basis, and the mole ratio of the contents of fluorine and zirconium satisfies the following relation: 3 = F/Zr = 6.