ZL102铝合金在3% NaCl溶液中的微区电化学特性
Electrochemical Characteristics in Micro Area of ZL102 Aluminum Alloy in 3% NaCl Solution
摘 要
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。
扫描电化学显微镜技术（SECM）
腐蚀
金属间化合物
腐蚀微电池
ZL102 aluminum alloy
scanning electrochemical microscopy (SECM)
corrosion
intermetallic compound
corrosion micro-cell
Abstract
Using scanning electrochemical microscopy (SECM), the corrosion behavior of ZL102 aluminum alloy in 3% NaCl (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.
中图分类号 TG172 DOI 10.11973/fsyfh-201704009
所属栏目 试验研究
基金项目
收稿日期 2016/7/23
修改稿日期
网络出版日期
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引用该论文: PAN He-bin,LI Liang-cheng,KONG Xiao-dong,LI Xi. Electrochemical Characteristics in Micro Area of ZL102 Aluminum Alloy in 3% NaCl Solution[J]. Corrosion & Protection, 2017, 38(4): 287
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【7】林昌健,李彦,林斌,等. 扫描电化学微探针的发展及其在局部腐蚀研究中的应用[J]. 电化学,2009,15(2):121-128.
【8】NIU L,YIN Y H,GUO W K,et al. Application of scanning electrochemical microscope in the study of corrosion of metals[J]. Journal of Materials Science,2009,44(17):4511-4521.
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【10】王力伟,李晓刚,杜翠微,等. 微区电化学测量技术进展及在腐蚀领域的应用[J]. 中国腐蚀与防护学报,2010,30(6):498-504.
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【12】WITTSTOCK G,BURCHARDT M,PUST S E,et al. Scanning electrochemical microscopy for direct imaging of reaction rates[J]. Angew Chem Int Ed Engl,2007,46(10):1584-1617.
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【23】彭淳. 铸造铝合金中有害铁相的变质及去除技术研究[D]. 广州:华南理工大学,2012.
【24】张琦,李荻,丁学谊,等. LC4铝合金晶间腐蚀电化学机理[J]. 材料保护,1996,29(8):6-8.
【25】王祝堂,田荣璋. 铝合金及其加工手册[M]. 湖南:中南大学出版社,2000:133.
【26】汪俊英,孔小东,刘信. 铝合金在NaCI溶液中的电化学腐蚀行为[J]. 装备环境工程,2010,7(3):38-41.
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