Corrosion behavior of Al-Mg2Si alloys with/without addition of Al-P master alloy

Authors

Zedi Li, Tianjin University
Chong Li, Tianjin University
Zhiming Gao, Tianjin UniversityFollow
Yongchang Liu, Tianjin University, Nankai University
Xiang-Fa Liu, Shandong University
Qianying Guo, Tianjin University
Liming Yu, Tianjin University
Huijun Li, University of WollongongFollow

RIS ID

103883

Publication Details

Li, Z., Li, C., Gao, Z., Liu, Y., Liu, X., Guo, Q., Yu, L. & Li, H. (2015). Corrosion behavior of Al-Mg₂Si alloys with/without addition of Al-P master alloy. Materials Characterization, 110 170-174.

Abstract

Corrosion resistance is an important fact to be considered in practical engineering application of Al-Mg₂Si alloys, besides the mechanical properties. So in the paper, corrosion behavior of Al-20%Mg₂Si with/without Al-3%P master alloy in 3.5% NaCl solution was investigated. For the Al-20%Mg₂Si alloy, Mg₂Si acts as anode and corrosion starts from its surface at the initial stage of corrosion process. As the corrosion proceeds, electrochemical polarity converts between Mg₂Si and α(Al), which results in the corrosion of Al matrix with the formation of pits. Moreover, after addition of Al-3%P master alloy, Mg₂Si transforms from enormous dendrite to fine and uniformly distributing polyhedron, which inhibits the corrosion pits from propagating in Al matrix and enhances the corrosion resistance of Al-20%Mg₂Si.