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

Citation data:

Corrosion Science, ISSN: 0010-938X, Vol: 95, Page: 133-142

Publication Year:
2015
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Citations 13
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Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/11162
DOI:
10.1016/j.corsci.2015.03.007
Author(s):
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
Publisher(s):
Elsevier BV; PERGAMON-ELSEVIER SCIENCE LTD
Tags:
Materials Science; Chemical Engineering; Chemistry; A. Alloy; A. Magnesium; C. Pitting corrosion
article description
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 Mg 2 Sn 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 0.6 M NaCl solution, the extruded alloys with 1–3 wt% Al showed over 30 times higher corrosion rates than those containing less than 0.3 wt% Al; this discrepancy was attributed to the presence of Al 5 Fe 2 particles acting as strong cathodic sites for H 2 evolution during corrosion.