The present invention discloses an electrolytic chromate bath for zinc-based galvanized steel, and a method for producing an electrolytic chromate-treated zinc-based galvanized steel sheet having excellent corrosion resistance, fingerprint resistance, and chromium elution resistance. At least 1 selected from the group consisting of silver hexavalent chromium ions in the form of metal Cr in terms of metal Cr, 0.1 to 2.0 g / l in the form of trivalent chromium ions, divalent nickel ions and divalent cobalt ions; 0.1-20 g / l of species, 50-300 g / l of silica sol in terms of its solid content, 0.05-1.0 g / l of phosphate ions in terms of PO 43- , 1-50 g / l of sulfate ions, In addition, when the ratio of trivalent chromium ion concentration / total chromium ion concentration is less than 0.1, and the ratio of silica sol solid content concentration / trivalent chromium ion concentration is greater than 70, the pH is characterized in that the range of 2.5 ~ 3.8, Electrolytic Chrome Treated zinc in the manufacturing method of a plated steel sheet as a cathode to the steel sheet subjected to a zinc plating on at least one side, wherein the electrolytic chromate bath, yokon 30 ~ 70 ℃, electrolytic chromate treatment under the conditions of a current density of 1 ~ 50 A / dm 2 Characterized in that.
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机译：本发明公开了一种用于锌基镀锌钢的电解铬酸盐浴，以及具有优异的耐腐蚀性，耐指纹性和耐铬溶出性的电解铬酸盐处理的锌基镀锌钢板的制造方法。以金属Cr计，选自金属Cr形式的六价银铬离子，以三价铬离子，二价镍离子和二价钴离子形式的0.1至2.0g / l中的至少一种; 0.1-20 g / l的物种，50-300 g / l的固体硅溶胶，0.05-1.0 g / l的PO 4 3磷酸根离子-，硫酸根离子为1-50 g / l，此外，当三价铬离子浓度/总铬离子浓度之比小于0.1时，硅溶胶固体成分浓度/三价铬离子之比浓度大于70时，pH的特征在于2.5至3.8的范围内，在至少一侧经过锌镀的钢板作为阴极的电镀钢板的制造方法中，电解铬处理过的锌;其中，电解铬酸盐浴，约克温度为30〜70℃，在电流密度为1〜50 A / dm 2 的条件下进行处理。
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