Effect of Rare Earth on Corrosion Resistance of Trivalent Chromium Color Passivation Film onElects＇opiated Zinc Coaling LIU Yah, ZHANG Jian-gang, FENG Li-ming（ School of Material Science and Engineering, Shandong Jianzhu University, Jinan 250101 ）. Cailiao Baohu 2012,45 （ 04 ）, 01 -04 （Ch）. Rare earth elements （ La^3 ＋ , Ce^3 ＋ and Ce^4 ＋ ） were introduced into trivalent chromium passivation fluid. The effect of rare earth content on the corrosion resistance of the color passivafion film on electro- plated Ni coating was investigated by dripping test of aqueous lead acetate, measurement of Tafel curves, and saline water soaking test. It was found that the addition of rare earth contributed to improved corrosion resistance of trivalent Cr passivation Fdm even in the absence of sealing, and Ce^4＋ was the most effective in improving the corrosion resistance.
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