采用电化学工作站的开路电位和电化学阻抗谱法对牙科铸造镍铬合金在不同浓度表没食子儿茶素没食子酸酯(EGC)人工唾液中的腐蚀行为进行了比较,并用扫描电镜观察比较了腐蚀后镍铬合金的表面形貌.结果表明,镍铬合金在不同浓度EGCG人工唾液中的开路电位大小顺序为1.09/L<4.0g/L<0g/L,且在1.09/L、4.0g/LEGCG人工唾液中其开路电位较快地达到了一个稳定值;同时,镍铬合金在不同浓度EGCG人工唾液中的等效电路极化电阻大小顺序为1.09/L<4.0g/L<0g/L.扫描电镜显示镍铬合金在不同浓度EGCG中均有不同程度的腐蚀,表面出现点蚀,分布不均匀,孔径大小不一,其中以1.09/L EGCG人工唾液中的腐蚀最明显,其次是4.0g/L EGCG.由此均说明镍铬合金在1.0g/L EGCG人工唾液中的耐腐蚀性能最差,各试件的耐腐蚀性能排序为1.0g/L EGCG<4.0g/L EGCG<0g/L EGCG.
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