Effect of Al/Mn ratio on corrosion behavior of lean Mg-Zn-Ca-Al-Mn alloy processed by twin-roll casting

被引：24

作者：

Wang, Bing-Yu ^{[1
]}

Li, Mei-Xuan ^{[1
]}

Li, Yi-Jia ^{[1
]}

Wang, Yu-Fei ^{[1
]}

Gao, Yipeng ^{[1
]}

Wang, Hui-Yuan ^{[1
,2
]}

机构：

[1] Jilin Univ, Sch Mat Sci & Engn, Key Lab Automobile Mat, Minist Educ, 5988 Renmin St,Nanling Campus, Changchun 130025, Peoples R China

[2] Jilin Univ, Int Ctr Future Sci, Changchun 130012, Peoples R China

来源：

CORROSION SCIENCE | 2023年 / 212卷

基金：

中国国家自然科学基金;

关键词：

A; Magnesium; Alloy; intermetallics; C; passive films; Pitting corrosion; MAGNESIUM ALLOY; ELECTROCHEMICAL CORROSION; MECHANICAL-PROPERTIES; MICROSTRUCTURE; PHASE; REFINEMENT; EXTRUSION; MANGANESE; ADDITIONS; AZ31;

D O I：

10.1016/j.corsci.2022.110938

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Adopting twin-roll casting (TRC) technique, lean Mg-1.2Zn-0.3Ca-0.3Al-xMn (x = 0.25, 0.38, 0.5 wt%) alloys with different Al/Mn ratio were prepared. The stoichiometric ratio of Al8Mn5 is taken as dividing line. Under Al/ Mn>1.6, rhombohedral Al8Mn5 is formed, while under Al/Mn <= 1.6, cubic beta-Mn is generated. Because of lower Volta potential of Al8Mn5 than beta-Mn, the alloy with Al/Mn>1.6 shows the lowest average corrosion rate (4.55 mm y-1). The formation of fine rather than coarse Al8Mn5 weakens micro-galvanic corrosion and relieves stress concentration, thus simultaneously endowing the alloy (Al/Mn>1.6) with admirable corrosion resistance and mechanical properties (UTS:-266 MPa, YS:-193 MPa, EF:-20 %).

引用

页数：16

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