Different electrochemical techniques were used to study the corrosion behavior of UNS S32205 duplex stainless steel (DSS) welded autogenously using a single-pass by electron beam welding process, supplemented by microstructural characterization. Furthermore, a comparative study was also performed between multipass gas tungsten arc (GTA)-welded and EB-welded DSS for their microstructure and corrosion behavior. The differences in weld thermal cycle and chemical composition influenced the fusion zone microstructure of both the welds and eventually their corrosion properties. The general corrosion resistance of the EB weld was lower than the base metal and higher than the GTA weld despite its weld zone being characterized by a relatively unbalanced phase ratio (α/γ) in comparison to the GTA weld. However, the EB weld showed relatively higher susceptibility to pitting corrosion than the base metal and GTA weld due to its poor repassivation characteristics and poor resistance to pit growth.

中文翻译：

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电子束焊接UNS S32205双相不锈钢电化学腐蚀行为及显微组织特征

使用不同的电化学技术研究了使用单道电子束焊接工艺自熔焊接的 UNS S32205 双相不锈钢 (DSS) 的腐蚀行为，并辅以微观结构表征。此外，还对多道钨极气体保护焊 (GTA) 焊接和 EB 焊接 DSS 的微观结构和腐蚀行为进行了比较研究。焊缝热循环和化学成分的差异影响了两个焊缝的熔合区微观结构，并最终影响了它们的腐蚀性能。尽管与 GTA 焊缝相比，EB 焊缝的焊接区具有相对不平衡的相比 (α/γ)，但其总体耐腐蚀性能低于母材，但高于 GTA 焊缝。然而，