Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Microstructure and Corrosion Behavior of Mg-xSn (x = 1, 3, 5, 7, 9 wt.%) Alloys

Mg-xSn(x = 1, 3, 5, 7, 9 wt.%) 합금의 미세조직 및 부식특성

  • Kang, Yong-Muk (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Sang-Hyun (Department of Materials Science and Engineering, Pusan National University) ;
  • Jo, Su-Mi (Department of Materials Science and Engineering, Pusan National University) ;
  • Park, Kyung-Chul (Department of Materials Science and Engineering, Pusan National University) ;
  • Kim, Byeong-Ho (Department of Materials Science and Engineering, Pusan National University) ;
  • Park, Ik-Min (Department of Materials Science and Engineering, Pusan National University) ;
  • Park, Yong-Ho (Department of Materials Science and Engineering, Pusan National University)
  • Received : 2011.10.27
  • Accepted : 2011.12.14
  • Published : 2011.12.31
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Abstract

In the present work, the corrosion properties of Mg-xSn (x = 1, 3, 5, 7 and 9 wt.%) alloys have been investigated. Potentiodynamic polarization and immersion tests were carried out in 3.5% NaCl solution of pH 7.2 at room temperature to measure the corrosion properties of Mg-xSn (x = 1, 3, 5, 7 and 9 wt.%) alloys. With increase of the Sn contents, the volume fraction of the $Mg_2Sn$ phase was increased. The corrosion rate of Mg-xSn alloys was increased up to 7 wt.%Sn and decreased above 9 wt.%Sn. Initiation of galvanic site during immersion mainly occurred at Mg/$Mg_2Sn$ interface and propagation went into ${\alpha}$-Mg. For this reason, corrosion properties of Mg-xSn (added from 1 wt.%Sn to 7 wt.%Sn alloys) alloys are decreased because the galvanic site was increased with increasing Sn addition. In Mg-9wt.%Sn alloy, however, the corrosion site were changed from Mg/$Mg_2Sn$ interface to ${\alpha}$-Mg/$M_2Sng$ interface in lamellar structure. Preferentially corrosion of ${\alpha}$-Mg/$M_2Sn$ interface in lamellar structure impeded corrosion propagation went into ${\alpha}$-Mg.

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