Role of microalloyed Sm in enhancing the corrosion resistance of hot-rolled Mg-8Sn-1Al-1Zn alloy

被引：29

作者：

Kwon, Jaeho ^{[1
]}

Baek, Soo-Min ^{[1
]}

Jung, Hoseok ^{[1
]}

Kim, Jong Chan ^{[1
]}

Lee, Si-Young ^{[1
]}

Park, Sung Soo ^{[1
]}

机构：

[1] Ulsan Natl Inst Sci & Technol, Dept Mat Sci & Engn, Ulsan 44919, South Korea

来源：

CORROSION SCIENCE | 2021年 / 185卷

基金：

新加坡国家研究基金会;

关键词：

Mg alloy; Microalloying; Phase; Volta potential; Microgalvanic corrosion; AGE-HARDENING RESPONSE; ZN-AL ALLOY; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; LOCALIZED CORROSION; STRETCH FORMABILITY; CREEP-BEHAVIOR; HIGH-STRENGTH; MG; SN;

D O I：

10.1016/j.corsci.2021.109425

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report that the corrosion resistance of hot-rolled Mg?8Sn?1Al?1Zn alloy was significantly enhanced by Sm microalloying. Corrosion rates, measured after immersion for 72 h in 0.6 M NaCl solution, were found to be 2.7 and 19 mm y-1 for the alloys with and without an addition of 0.02 wt% Sm, respectively. Electrochemical and microstructural analyses revealed that the enhanced corrosion resistance achieved by Sm microalloying is mainly a result of a reduced H2 evolution rate owing to the presence of Al8Fe4Sm particles instead of nobler Al5Fe2 particles, which highly accelerate microgalvanic corrosion in the alloy without Sm microalloying.

引用

页数：12

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