【摘要】 通过正交试验确定了AZ91D镁合金在CeCl3-H2O2体系中的最佳成膜条件.利用扫描电镜对转化膜进行形貌观察和成分分析,利用浸泡集气和电化学方法了膜层的耐腐蚀性能.结果表明,在最佳成膜条件下,形成的膜层均匀、致密.在3.5%NaCl溶液和0.15mol/LH3BO3/0.05mol/LNa2B4O7缓冲溶液中的动电位极化测试表明,最佳条件下铈盐转化处理可使合金的腐蚀电位正移,腐蚀电流密度明显降低,起到一定的防护作用.更多还原

【Abstract】 The optimal process of chemical conversion treatment for AZ91D magnesium alloy in CeCl3-H2O2 system was determined by orthogonal experiments.The microstructure and morphology of the conversion film were analyzed by scanning electron microscopy.The results show that the film formed under the optimal processing conditions is uniform.The corrosion behavior of the specimens with and without conversion film was investigated by methods of collecting hydrogen gas and potentiodynamic polarization in neutral 3.5 wt% NaCl solution and 0.15 mol·dm-3H3BO3/0.05 mol·dm-3Na2B4O7 solution.The results show that the corrosion potentials increase while the corrosion current density decreases which clearly exhibits a passivation behvior.The conversion film can provide good protection to AZ91D alloy.更多还原