Journal
MATERIALS RESEARCH EXPRESS
Volume 7, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/aba149
Keywords
magnesium alloys; Sn; corrosion behavior; volta potential
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Funding
- National Natural Science Foundation of China [51961026]
- Interdisciplinary Innovation Fund of Nanchang University
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The effect of Sn content on the mechanical properties and corrosion behavior of Mg-3Al-xSn alloys was investigated by SEM-EDXS, XRD, electrochemical measurements, and scanning Kelvin probe force microscopy (SKPFM). The results showed that when the Sn content was 1.4 wt%, Sn dissolved in the alpha-Mg matrix and then precipitated as an intermetallic compound (Mg2Sn). The combined results of mass loss, hydrogen evolution, and electrochemical measurements indicated that Mg-3Al-1Sn had a low corrosion rate. The SKPFM results showed that the Volta potential of Mg2Sn particles, Al-Mn, and beta-Mg(17)Al(12)phases were 100, 80, and 50 mV higher than the matrix, respectively. Therefore, the Mg2Sn phase that formed in Mg-3Al-xSn served as a local cathode due to its high potential, which accelerated microgalvanic corrosion along with the secondary local cathode (Al-Mn). The Sn solution strengthening and secondary phase strengthening (fine Mg2Sn particles) improved the mechanical properties of the Mg-3Al-xSn alloys.
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