通过SEM,XPS,XRD分析稀土转化膜形貌、结构及物相,由浸泡实验、中性盐雾实验、电化学测量电化学参数,对比镀锌层、稀土转化膜及低铬酸盐转化膜样品的耐蚀性能,并计算稀土转化膜在5%NaCl溶液中的腐蚀动力学参数.结果表明:稀土转化膜是由微小颗粒堆积而成的完整、细密的锌和铈氧化物及氢氧化物的复合膜层,该膜层对基体镀锌层的覆盖性较好,阻碍了O2的传输和电子的传递,对腐蚀的阴、阳极反应均有不同程度的抑制,降低腐蚀动力,有效地保护了基体不受腐蚀介质的侵蚀,可有效提高镀锌层的耐蚀性能,其耐蚀性能优于低铬酸盐转化膜.
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