Why CoCrFeMnNi HEA could not passivate in chloride solution?-A novel strategy to significantly improve corrosion resistance of CoCrFeMnNi HEA by N-alloying

被引：121
作者：
Feng, Hao [1 ]
Li, Hua-Bing [1 ,2 ]
Dai, Jing [1 ]
Han, Yu [1 ]
Qu, Jin-Dong [1 ]
Jiang, Zhou-Hua [1 ,2 ]
Zhao, Yang [3 ]
Zhang, Tao [3 ]
机构：
[1] Northeastern Univ, Sch Met, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Key Lab Ecol Met Multimet Ores, Minist Educ, Shenyang 110819, Peoples R China
[3] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
来源：
CORROSION SCIENCE | 2022年 / 204卷
基金：
中国国家自然科学基金;
关键词：
Alloy; Modelling studies; Passive films; HIGH-ENTROPY ALLOY; DUPLEX STAINLESS-STEEL; PITTING CORROSION; BEHAVIOR; NITROGEN; PHASE; NUCLEATION; ACID; TEMPERATURE; ENVIRONMENT;
D O I：
10.1016/j.corsci.2022.110396
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This work elaborated the underlying mechanism for the non-passivation of CoCrFeMnNi HEA in chloride solution based on the dissolution-diffusion-deposition model. A novel N-alloying strategy was proposed to significantly improve the corrosion resistance of CoCrFeMnNi HEA. Modelling results indicated that N could consume H+ and relieve the acidification on the surface of HEA, thus accelerating deposition of Cr and Fe oxides and hydroxides. Thereby, the nucleation rate and growth rate of passive film were apparently enhanced after N-alloying, which agreed well with the less defective and thinner passive film. Finally, the element selection for designing corrosion resistant HEAs was recommended.
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页数：17
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