Coupling effect of precipitates and hydrogen on pitting corrosion of stainless steel: Low potential region around precipitates

被引：0
|
作者：
Liu, Ming [1 ,2 ]
Xu, Lining [1 ,2 ]
Qiao, Lijie [1 ,2 ]
Yan, Yu [2 ]
Zhang, Binglu [2 ]
Wang, Xuehan [1 ,2 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Nucl Power Safety Technol & Equipmen, Beijing 100083, Peoples R China
[2] Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 241卷
基金：
中国国家自然科学基金;
关键词：
Stainless steel; Pitting corrosion; Hydrogen; Precipitate; ANODIC-DISSOLUTION; PASSIVE FILM; DUPLEX;
D O I：
10.1016/j.corsci.2024.112514
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The coupling effect of hydrogen and NbCrN precipitate on pitting initiation and propagation of stainless steel were studied. After hydrogen charging, HMT results showed that more hydrogen was enriched on and around the precipitates. According to In-situ SKPFM and immersion results, the Volta potential of the precipitates is higher than that of the matrix before and after hydrogen charging. However, after hydrogen charging, a low Volta potential region appeared around the precipitates. The enrichment of hydrogen around the precipitates, the low potential around the precipitates, and consequent galvanic coupling effect lead to pits preferentially initiating and developing around the precipitates.
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页数：9
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