中文摘要：

分别采用浸泡腐蚀实验、电化学测试技术、扫描电化学显微镜（SECM）分析技术和慢应变速率拉伸（SSRT）及应力腐蚀（SCC）实验方法对比研究了316L和HR-2奥氏体不锈钢在三氯化铁溶液中的腐蚀行为,并探讨了腐蚀机理。结果表明,不受力条件下316L和HR-2不锈钢的耐腐蚀性能均较好,316L钢呈现出较轻的点腐蚀现象。在动态拉应力作用下,316L和HR-2不锈钢均表现出较高的应力腐蚀开裂敏感性,原因是拉应力促进了不锈钢表面钝化膜的破裂,加速应力腐蚀裂纹的萌生和扩展。316L不锈钢的SCC敏感性稍高于HR-2不锈钢,归因于316L不锈钢点蚀敏感性稍高,因而表面钝化膜在动态拉伸载荷作用下更易于破裂。

英文摘要：

The corrosion behavior of stainless steels 316 L and HR-2 in ferric chloride solution was investigated by immersion method, electrochemical test, scanning electrochemical microscopy（SECM）,slow strain rate tensile test（SSRT） and stress corrosion cracking（SCC） test. The results demonstrate that the corrosion resistance of both HR-2 SS and 316 L SS without stress is better, only 316 L SS is slight sensitive to pitting. However, under dynamic tensile stress, the SCC susceptibility of the two steels is high. This is because dynamic tensile stress promotes the rupture of surface passive film, and accelerates the initiation and propagation of SCC crack. 316 L SS exhibited more sensitive to SCC than HR-2SS, which is due to the pitting susceptibility of 316 L is higher, thereby, the passive film on 316 L can be destroyed easily under dynamic tensile loading.