采用扫描电化学显微镜技术(SECM)深入研究了ZL102铝合金在3％ NaCl(质量分数)溶液中的腐蚀行为,用光学显微镜和扫描电镜观察其腐蚀形貌,用能谱仪对夹杂物和腐蚀产物进行分析.结果表明:在3％ NaCl溶液中,金属间化合物与ZL102铝合金基体形成微电池,金属间化合物的电位高于基体的,使基体优先腐蚀溶解;腐蚀过程中铝合金表面活性不稳定,是因为尺寸较小的金属间化合物因周围基体溶解容易脱落,并在其他区域沉淀,只有尺寸较大的金属间化合物周围基体产生持续腐蚀溶解,最终形成点蚀.
Using scanning electrochemical microscopy (SECM),the corrosion behavior of ZL102 aluminum alloy in 3％ NaC1 (mass fraction) solution was investigated.The corrosion morphology was observed by optical microscopy and scanning electron microscopy (SEM),and the inclusions and corrosion products were analyzed by energy dispersive spectroscopy (EDS).The results show that the micro cell formed between intermetallic compound and matrix of ZL102 aluminum alloy.The potential of intermetallic compound was higher than that of the matrix,which resulted in the matrix preferential dissolution in 3％ NaCl solution.The activity of aluminum alloy surface was not stable during the corrosion process because the smaller intermetallic compounds were easy to fall off due to the dissolution of surrounding matrix,and precipitated in other regions,and only the matrix around larger intermetallic compounds continuously dissolved,leading to pitting ultimately.
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