Influence of alloyed Al on the microstructure and corrosion properties of extruded Mg–8Sn–1Zn alloys
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Corrosion Science, ISSN: 0010-938X, Vol: 95, Page: 133-142
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- Materials Science; Chemical Engineering; Chemistry; A. Alloy; A. Magnesium; C. Pitting corrosion
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.