Abstract In this work, the essential mechanism of “loss of passivation” (LOP) effect for a 13 wt. % Cr-type martensitic stainless steel (MSS) is studied via electrochemical and microstructure approaches. The MSSs were quenched at 1030 °C and then tempered at 440−600 °C. Electrochemical results show that the tempering range for “LOP” is 460−540 °C. Severe corrosion occurred on 520 °C-tempered MSS after being immersed in Cl− containing solution for 35 min. Transmission electron microscopy (TEM) observation towards the corroded area of 1030-520 sample reveals the massive precipitation of nano-sized Cr-rich carbides, which is the essential cause for the “LOP” of MSSs.

中文翻译：

---

揭示 Cr-13 型马氏体不锈钢的温度窗口和“钝化损失”效应机制

摘要在这项工作中，13 wt. 的“钝化损失”（LOP）效应的基本机制。通过电化学和微观结构方法研究了 % Cr 型马氏体不锈钢 (MSS)。MSS 在 1030 °C 下淬火，然后在 440-600 °C 下回火。电化学结果表明，“LOP”的回火范围为 460-540 °C。浸入含 Cl− 溶液 35 分钟后，520 °C 回火的 MSS 发生严重腐蚀。对 1030-520 样品腐蚀区域的透射电子显微镜 (TEM) 观察揭示了纳米级富铬碳化物的大量沉淀，这是 MSS“LOP”的根本原因。