ScholarWorks: Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg-8Sn-1Zn alloys

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Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg-8Sn-1Zn alloys

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Title: Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg-8Sn-1Zn alloys

Author: Kim, Hyeon Ju; Kim, Beomcheol; Baek, Soo-Min; Sohn, So-Dam; Shin, Hyung-Joon; Jeong, Hu Young; Yim, Chang Dong; You, Bong Sun; Ha, Heon-Young; Park, Sung Soo

Abstract: Microstructure and corrosion properties of extruded Mg-8Sn-1Zn alloys with varying Al contents were investigated. Microstructures of the extruded alloys mainly consisted of α-Mg grains and Mg2Sn particles in common. Addition of Al to the ternary alloy resulted in the formation of different types of Al-Fe-based intermetallic particles depending on Al contents. In 0.6M NaCl solution, the extruded alloys with 1-3wt% Al showed over 30 times higher corrosion rates than those containing less than 0.3wt% Al; this discrepancy was attributed to the presence of Al5Fe2 particles acting as strong cathodic sites for H2 evolution during corrosion. ⓒ 2015 Elsevier Ltd