Technical Optimization and Corrosion Resistance of Cerium Conversion Film

Cerium conversion film was prepared on anodized aluminum alloy by chemical deposition.The morphology and elemental composition of the cerium conversion film and anodized aluminum alloy were analyzed by SEM and EDX.The corrosion resistance was evaluated by methods of polarization curves,electrochemical impedance spectroscopy and drop experiment.It was found that the cerium conversion film could be readily prepared on anodized aluminum alloy,and had better corrosion resistance than the anodized aluminum alloy.The optimal technical parameters of cerium conversion film were 3 g/L Ce2(SO4)3,20 ml/L H2O2,50 ℃ and 60 min.