Abstract Intergranular corrosion of welded joints using multi-strand winded welding wire was investigated using the double loop electrochemical potentiokinetic reactivation (DL-EPR) tests, intergranular corrosion tests and scanning Kelvin probe force microscopy (SKPFM) tests. The results revealed welded joint in high heat input and low cooling rate shows the highest DOS value, and undergoes the most important weight loss during intergranular corrosion tests. While welded joint in low heat input and cooling rate has the highest corrosion resistance. SKPFM also indicated that welded joint in the low cooling rate and heat input presents low potential and is not easy for electrochemical reaction.

中文翻译：

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焊接热输入和冷却速度对高氮奥氏体不锈钢焊接接头晶间腐蚀行为的影响

摘要 采用双回路电化学动电位再活化（DL-EPR）试验、晶间腐蚀试验和扫描开尔文探针力显微镜（SKPFM）试验研究了多股缠绕焊丝焊接接头的晶间腐蚀。结果表明，在高热输入和低冷却速率下的焊接接头显示出最高的 DOS 值，并且在晶间腐蚀试验中经历了最重要的重量损失。而焊接接头在低热输入和冷却速度下具有最高的耐腐蚀性。SKPFM 还表明，焊接接头在低冷却速度和热输入下呈现低电位，不易发生电化学反应。