中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 36 No. 2 February 2026 |
（a Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, China;
b International Center of Future Science, Jilin University, Changchun 130012, China）
Abstract:The impact of Mn addition on the microstructure, mechanical properties and corrosion behavior of T6-treated Al-Si-Mg-xMn (x=0.2-1.0 wt.%) alloys in a 3.5 wt.% NaCl solution was investigated. The results showed that adding 0.2 wt.% Mn to T6-treated Al-Si-Mg alloys enhanced the corrosion resistance by promoting the formation of α-AlFeMnSi phase, characterized by smaller absolute Volta potential values compared to eutectic Si, β-AlFeSi and π-AlFeMgSi phases. However, the addition of 0.5 wt.% Mn and 1.0 wt.% Mn to the T6-treated Al-Si-Mg alloys increased the size of the α-AlFeMnSi phase. This decreased the properties of T6-treated Al-Si-Mg alloys. Therefore, the optimum Mn content was 0.2 wt.%, providing a novel approach for synergistically enhancing mechanical properties and corrosion resistance of Al-Si-Mg alloys.
Key words: Al-Si-Mg-xMn alloys; secondary phase; absolute Volta potential; microstructure; mechanical properties; corrosion resistance
