The influence of microstructural evolutions on electrochemical corrosion and passive behavior in precipitation-strengthened high-entropy alloys

被引：2
|
作者：
Zhang, J. Y. [1 ]
Zhou, Y. H. [2 ]
Ren, Z. Q. [3 ]
Luan, J. H. [1 ]
Zhao, Y. L. [3 ]
Yang, T. [1 ,4 ,5 ]
机构：
[1] City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
[2] City Univ Hong Kong, Dept Mech Engn, Hong Kong, Peoples R China
[3] Harbin Inst Technol, Sch Mat Sci & Engn, Shenzhen, Peoples R China
[4] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen 518057, Peoples R China
[5] 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 / 233卷
基金：
中国国家自然科学基金;
关键词：
High -entropy alloys; Microstructural evolutions; Corrosion behavior; Passive film; Micro -galvanic corrosion; STAINLESS-STEEL; FILMS; MICROSCOPY;
D O I：
10.1016/j.corsci.2024.112074
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Effects of microstructural evolutions on electrochemical corrosion properties and passive film characteristics of precipitation -strengthened (Ni 2 Co 2 FeCr) 92 Al 4 Nb 4 high -entropy alloys (HEAs) were investigated in a saline environment. Compared with single-phase FCC alloys, the appearance of nano -sized L1 2 particles increases the metastable pitting activities and slightly reduces the pitting potential, while the lamellar D0 19 phase further deteriorates the localized corrosion resistance. The chemical composition and oxide state of passive films are closely related to the different precipitation scenarios. The corrosion morphologies of the single-phase and L1 2 - strengthened alloys are dominated by pitting, whereas the intergranular corrosion (IGC) and intragranular dealloying-like corrosion occur in the D0 19 -strengthened alloy.
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页数：14
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