刘晓,赵良群,葛杰,陈雷

• 1:江苏集萃冶金技术研究院有限公司江苏冶金技术研究院
• 2:江苏理工学院机械工程学院
• 3:燕山大学机械工程学院

摘要(Abstract)：

采用电化学阳极极化、电化学阻抗谱、光学显微镜、扫描电镜、能谱仪及夹杂物统计分析等研究了稀土(RE)对UNS S31803双相不锈钢中夹杂物的变质行为及点蚀萌生行为的影响。结果表明：稀土能提高试验钢的点蚀电位和钝化膜电阻，未加RE与加RE的钢的点蚀电位分别为726 mV与1019 mV,钝化膜电阻分别为26590Ω·cm~2与67170Ω·cm~2,稀土通过降低钢中夹杂物的数量与尺寸及形成稳定的稀土氧化物且弥散分布在钢中等因素提高了其耐点蚀性能；与未加RE钢相比，加RE钢中的夹杂物数量减少了25.93%,直径为0～3μm的夹杂物数量占比增加了21.57%,直径为3～5μm、5～7μm和>7μm的夹杂物数量占比分别减少了15.99%、5.59%和4.99%;加入稀土后，试验钢中的含Cr、Al、Mn和Ti等氧化物夹杂变质为稀土氧化物；未加稀土的钢点蚀发生在氧化物夹杂与基体连接的微裂纹处，并向氧化物夹杂处扩展；而加稀土的钢点蚀发生在稀土氧化物夹杂与基体连接的微裂纹处，并向基体延伸；基于此，绘制了夹杂物对双相不锈钢腐蚀微区点蚀萌生和扩展影响的示意图。

关键词(KeyWords)： 双相不锈钢;稀土;点蚀;稀土氧化物

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51675467);; 江苏省高端结构材料重点实验室开放基金(hsm1906)

作者(Author): 刘晓,赵良群,葛杰,陈雷

DOI: 10.13289/j.issn.1009-6264.2022-0215

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