The corrosion processes and its influence on the FCG curves of the 2524-T3 alloy joined by FSW was studied in the nugget and BM. To assess the corrosion process, SVET, pH micro-potentiometry and EIS were used. The localised corrosion results showed similar BM and nugget zone electrochemical behaviour, while the TMAZ/HAZ region was electrochemically the weakest zone, susceptible to anodic dissolution. The FSW process and saline environment was found to modify the BM and nugget FCG resistance, being more detrimental for the BM due to the primary IM particles that are not present in the nugget, making it chemically more homogeneous.

中文翻译：

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FSW工艺连接的2524-T3铝合金母材和熔核区域的腐蚀和腐蚀疲劳协同作用

在熔核和基体中研究了FSW加入的2524-T3合金的腐蚀过程及其对FCG曲线的影响。为了评估腐蚀过程，使用了SVET，pH微电位计和EIS。局部腐蚀结果显示出类似的BM和熔核区电化学行为，而TMAZ / HAZ区是电化学上最弱的区域，易于阳极溶解。发现FSW过程和盐碱环境会改变BM和矿块的FCG抵抗力，因为矿块中不存在主要的IM颗粒，因此对BM的危害更大，从而使其化学上更加均质。