Chemical conversion coating agent, surface-treated metal and surface treatment method

Abstract

A chemical conversion coating agent that enables chemical conversion coating by which favorable corrosion resistance is obtained after coating. A chemical conversion coating agent which contains (A) at least one metal component that is selected from the group consisting of zirconium, titanium and hafnium, (B) fluorine and (C) an allylamine-diallylamine copolymer, wherein the content of the metal component (A) is 10 to 10,000 ppm by mass in terms of elemental metal relative to the total mass of the chemical conversion coating agent; the content ratio of a diallylamine segment derived from diallylamine in the allylamine-diallylamine copolymer (C) is 52% to 98% by mole relative to the total of an allylamine segment derived from allylamine and the diallylamine segment; the weight average molecular weight of the allylamine-diallylamine copolymer (C) is 500 to 500,000; and the content of the allylamine-diallylamine copolymer (C) is 25 to 5,000 ppm by mass in terms of the resin solid content concentration relative to the total mass of the chemical conversion coating agent.

Dependencies are inferred from the claim text.