| 摘要 |
PURPOSE: To provide a chemical conversion coating agent which places a less burden on the environment and can apply good chemical conversion treatment to all metals such as iron, zinc and aluminum, and a surface-treated metal obtained using the same. CONSTITUTION: The chemical conversion coating agent comprises at least one kind selected from the group consisting of zirconium, titanium and hafnium; fluorine; and a water-soluble resin, wherein the water-soluble resin has, in at least a part thereof, a constituent unit expressed by chemical formula(1) and/or chemical formula(2), wherein the water-soluble resin is a polyvinylamine resin or a polyallylamine resin, wherein the water-soluble resin has a molecular weight of 500 to 500,000, and a content of the water-soluble resin in the chemical conversion coating agent is 5 to 5,000 ppm, wherein the chemical conversion coating agent further contain 1 to 5,000 ppm of at least one kind of a chemical conversion reaction accelerator selected from the group consisting of nitrite ion, nitro group-containing compounds, hydroxylamine sulfate, persulfate ion, sulfite ion, hyposulfite ion, peroxides, iron (III) ion, citric acid iron compounds, bromate ion, perchlorate ion, chlorate ion, chlorite ion, as well as ascorbic acid, citric acid, tartaric acid, malonic acid, succinic acid and salts thereof, and wherein the at least one kind selected from the group consisting of zirconium, titanium and hafnium has a content of 20 to 10,000 ppm in terms of metal, and the chemical conversion coating agent has a pH of 1.5 to 6.5.
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