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Unexpected cathodic role of Mg41Sm5 phase in mitigating localized corrosion of extruded Mg-Sm-Zn-Zr alloy in NaCl solution

Authors :
Yu-Jun Feng
Yufeng Cheng
Xiaobo Chen
Moucheng Li
Qian Li
Liang Wei
Source :
Corrosion Science. 159:108133
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

Effect of Mg41Sm5 second-phase on corrosion of as-cast and extruded Mg-Sm-Zn-Zr alloys in NaCl solution was investigated. The net-like Mg41Sm5 phase played a cathodic role in the as-cast alloy and induced obvious localized corrosion of adjacent anodic α-Mg grains. However, hot-extrusion deformed the relatively large net-like Mg41Sm5 phase into uniformly dispersed finer particles, which effectively mitigated localized corrosion and formed uniform protective film on the whole alloy surface. It enhanced the corrosion resistance of the extruded alloy for three times compared with the as-cast counterpart and outperformed that of benchmark Mg alloy AZ91.

Details

ISSN :
0010938X
Volume :
159
Database :
OpenAIRE
Journal :
Corrosion Science
Accession number :
edsair.doi...........fa5ff5af2be6e2b8f04a0e018a2d7a6b
Full Text :
https://doi.org/10.1016/j.corsci.2019.108133