Abstract This study reports the effects of the sigma phase on pitting corrosion behavior of thermally-aged duplex stainless steel (DSS). Analysis via structural, morphological, and electrochemical characterizations was performed. The corrosion assessment includes a potentiodynamic test in 1 M NaCl solution at temperatures of 25, 40, and 65 °C. 3D roughness images were taken and compared for all the specimens before and after the corrosion test. The potentiodynamic test combined with the method of optical profilometry was found to be a successful approach to evaluate the evolution of surface degradation mechanisms due to pitting corrosion.

中文翻译：

---

σ相显微组织对双相不锈钢/NaCl电解质对点蚀行为的影响

摘要 本研究报告了 σ 相对热时效双相不锈钢 (DSS) 点蚀行为的影响。通过结构、形态和电化学表征进行分析。腐蚀评估包括在 1 M NaCl 溶液中在 25、40 和 65 °C 的温度下进行的动电位测试。在腐蚀试验之前和之后，拍摄并比较所有试样的 3D 粗糙度图像。发现将动电位测试与光学轮廓测量法相结合是评估点腐蚀导致的表面退化机制演变的成功方法。