两种紫铜在3.5％NaCl溶液中的腐蚀性能比较

摘要

采用极化曲线和交流阻抗技术,研究了2种紫铜在3.5％(质量分数)NaC1溶液中的腐蚀行为,比较了其耐腐蚀性能.结果表明,随着浸泡时间的延长,2种紫铜的自腐蚀电位先降低再升高,腐蚀速率先增大后减小.金相观察发现紫铜T2的第二相夹杂颗粒大小不均匀、晶粒粗大,经扫描电镜和能谱分析后发现其夹杂的成分不同,这是导致其耐蚀性能出现差异的主要原因.%Copper T2 and TuP were immersed in 3.5% NaCl solution. Polarization and electrochemical impedance spectroscopy methods were applied to analyze the corrosion behavior of the two kinds of red copper. The result showed that self-corrosion potential of the two kinds of copper first decline and then climbs up with immersed time, and corrosion rate first increases and then decreases as the time increases. Microstructure of copper T2 showed that second phase inclusions are uneven size and coarse grains, and inclusion composition is different though SEM and EDS, which is the main reason for its poor corrosion resistance.