CHROMATE SOLUTION OF CONTROLLING AN ERUPTION OF A CHROME AND THE METHOD FOR MAKING C CHROMATE STEEL PLATE USING THE SAME

摘要

The chromate solution is prepared by (A) forming a chromium solution having 10-40 g/l chromium component at 0.3-0.7 chromium reduction ratio and (B) adding 3.0-25.0 g/l phosphoric acid, 1.0-5.0 g/l fluorine, 3.0-15.0 g/l silica and 0.05-3.0 wt% silane coupling agent. And the chromate steel plate is produced by coating a steel plate with the obtained chromate solution and drying it at 120-200 deg.C. The coated steel plate has good corrosion resistance, good surface appearance and prevents chromium from dissolving.