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在不同浓度配比的HCO_3~-和SO_4~(2-)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,在高电位范围的循环极化实验中,Cu的点蚀行为可分为活性溶解型点蚀和钝化膜破裂型点蚀;随SO_4~(2-)浓度的升高Cu点蚀的敏感性增大.由于HCO_3~-与SO_4~(2-)的协同作用,随HCO_2~-浓度升高点蚀敏感性呈先增大后减小的规律.在钝化膜破裂型点蚀中,SO_4~(2-)提高Cu点蚀的诱发能力;HCO_3~-降低Cu点蚀的诱发能力.2种离子对点蚀自修复能力的影响无明显规律.
The cyclic polarization behavior and pitting surface morphology of Cu working electrode were systematically investigated by cyclic polarization electrochemical test and SEM in different concentrations of HCO 3 - and SO 4 2- The results show that the pitting corrosion behavior of Cu can be divided into active dissolution pitting and passive film cracking pitting corrosion in the cyclic polarization experiments at high potential range. With the increase of SO 4 2- concentration, Cu The sensitivity of pitting corrosion increases.As the synergistic effect of HCO 3 ~ - and SO 4 2-, the pitting corrosion sensitivity firstly increases and then decreases with the increase of HCO 2 - In pitting corrosion, SO 4 2- enhances the inducing ability of Cu pitting corrosion while HCO 3 ~ - reduces the inducing ability of Cu pitting corrosion.The influence of 2 kinds of ions on pitting corrosion self-repairing ability has no obvious regularity.