Zinc plating is a good way of improving anti-corrosion ability of steel or iron, but zinc is easily corroded (such as production of 'white rusty'). In order to improve anti- corrosion ability and perfect appearance of zinc, surface of zinc is often passivated by traditional six-price chromium compound. However, six-price chromium has high toxicity. Accordingly it is of very important value to study chromium-free passivating [1] and three-price-chromium passivating [2]. So main study of Cr 3+ passivating,and prelim- inary study of molybdates' chromium-free passivating were carried out by us.
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