在HCO3-浓度为0.08 mol/L及不同浓度配比的SO42-和Cl-混合溶液中,利用循环极化电化学测试方法和SEM,对Cu工作电极的循环极化行为和点蚀表面形貌进行了系统的研究.结果表明,SO42-或Cl-均能促进Cu的阳极溶解,且二者间存在交互作用.Cl-能降低Cu电极的腐蚀电位,增强其电化学活性.在点蚀敏感区域图中,Cu发生点蚀的临界Cl-浓度为0.02 mol/L.当Cl-浓度较低时,SO42-对点蚀敏感性无影响；当Cl-浓度为中等时,SO42-抑制点蚀；当Cl-浓度较高时,SO42-使Cu点蚀敏感性先升高后降低.无论SO42-浓度的高低,Cl-都能促进点蚀.在本研究体系中,Cu的点蚀敏感性强烈地受到Cl-和SO42-的影响.
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