Understanding the impacts of L12 nanoprecipitates on the electrochemical and passive behavior of CoCrNiAlTi-type high-entropy alloys

被引：9
作者：
Zhang, J. Y. [1 ]
Chou, T. H. [1 ]
Zhang, J. X. [1 ]
Luan, J. H. [1 ]
Zhao, Y. L. [2 ]
Yang, T. [1 ,3 ,4 ]
机构：
[1] City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
[2] Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen 518055, Peoples R China
[3] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
[4] City Univ Hong Kong, Hong Kong Branch, Natl Precious Met Mat Engn Res Ctr NPMM, Hong Kong, Peoples R China
来源：
CORROSION SCIENCE | 2024年 / 235卷
基金：
中国国家自然科学基金;
关键词：
High-entropy alloys; Nanoscale precipitation; Electrochemical polarization; Passive film; Mechanical properties; STAINLESS-STEEL; RESISTIVITY DISTRIBUTIONS; IMPEDANCE SPECTROSCOPY; MEASUREMENT MODELS; FILMS; CORROSION; PRECIPITATION; 304-STAINLESS-STEEL; LAYERS; PH;
D O I：
10.1016/j.corsci.2024.112211
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This work investigated the effects of L12 nanoprecipitates on the electrochemical corrosion behavior and passive film characteristics of CoCrNiAlTi-type high-entropy alloys (HEAs) in chloride-containing solutions. Compared with the single-phase recrystallized alloys, the precipitation of the L12 phase destabilized surface passive films, thus deteriorating the localized corrosion resistance and increasing the metastable pitting activities of the L12strengthened HEA. Influenced by the L12-induced chemical inhomogeneities, the increase of Cr(OH)3 content in passive films together with the high galvanic corrosion tendency between the two phases was considered as the main reason for the increased susceptibility of the L12-strengthened alloys to localized corrosion attacks.
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页数：15
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