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Combined Effect of Ag and Mg Additions on Localized Corrosion Behavior of Al-Cu Alloys with High Cu Content
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-08-31 , DOI: 10.1007/s11665-020-05072-6
Jian Wang , Zhiyi Liu , Song Bai , Jing Cao , Juangang Zhao , Diping Zeng

The localized corrosion behavior of Al-Cu and Al-Cu-Mg-Ag alloys was investigated in a naturally aerated 0.6 M NaCl solution by in situ observations and electrochemical techniques. The combined roles of Ag and Mg in affecting the corrosion resistance of Al-Cu alloys were observed using electron probe microanalysis and scanning Kelvin probe force microscopy. Results prove that Al-Cu-Mg-Ag alloy exhibits a weaker susceptibility to pitting attack than Al-Cu alloy. Such difference is ascribed to Ag and Mg atoms dissolved in Al matrix that increase the potential of the Al matrix, resulting in a smaller potential difference between the Al2Cu particles and Al matrix, that is, a weaker galvanic corrosion couple.



中文翻译:

Ag和Mg的联合作用对高Cu含量Al-Cu合金局部腐蚀行为的影响

通过现场观察和电化学技术研究了在自然充气的0.6 M NaCl溶液中Al-Cu和Al-Cu-Mg-Ag合金的局部腐蚀行为。使用电子探针显微分析和扫描开尔文探针力显微镜观察到了Ag和Mg在影响Al-Cu合金耐蚀性中的综合作用。结果证明,Al-Cu-Mg-Ag合金比Al-Cu合金对点蚀的敏感性更弱。这种差异归因于溶解在Al基质中的Ag和Mg原子,其增加了Al基质的电势,导致Al 2 Cu颗粒和Al基质之间的电势差较小,即,较弱的电偶腐蚀对。

更新日期:2020-09-01
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