Effect of Mo on intergranular corrosion behavior in super-austenitic stainless steel

被引：32
作者：
Du, Hua-yun [1 ,2 ]
Hu, Qun-kun [1 ]
Yue, Xi -wen [1 ]
Jia, Jian-wen [1 ]
Wei, Ying-hui [1 ]
Hou, Li-feng [1 ,2 ]
Luo, Hong [3 ]
Wang, Qian [1 ]
He, Hong-wei [1 ]
Wei, Huan [1 ]
Liu, Xiao-da [1 ]
机构：
[1] Taiyuan Univ Technol, Dept Mat Sci & Engn, Taiyuan 030024, Peoples R China
[2] Aluminum Magnesium based new Mat R&D Co Ltd, Xing Xian Cty Econ & Technol Dev Zone, lvliang 035300, Peoples R China
[3] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Natl Mat Corros & Protect Data Ctr, Beijing 100083, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 231卷
关键词：
Super-austenitic stainless steel; Aging precipitation; sigma-phase; Intergranular corrosion; MECHANICAL ATTRITION TREATMENT; PRECIPITATION BEHAVIOR; SUSCEPTIBILITY; RESISTANCE;
D O I：
10.1016/j.corsci.2024.111986
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of the Mo element on the intergranular corrosion behavior was investigated on super-austenitic stainless steels. The sigma-phase structure and compositional changes of stainless steels with different Mo contents during aging at 800-900 degrees C were investigated by TEM, combined with electrochemical tests, and two different intergranular corrosion mechanisms were revealed. The low-Mo 904 L stainless steel induces severe intergranular electrochemical corrosion due to selective anodic dissolution at grain boundaries caused by decreased passivation ability and sigma-phase composition changes. The sigma-phase precipitation of 254SMo and AL-6XN with high-Mo leads to Cr and Mo depletion reduces passivation film continuity, and causes intergranular corrosion.
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页数：12
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