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Mg-xSn(x = 1, 3, 5, 7, 9 wt.%) 합금의 미세조직 및 부식특성
강용묵 ( Yong Muk Kang ),김상현 ( Sang Hyun Kim ),조수미 ( Su Mi Jo ),박경철 ( Kyung Chul Park ),김병호 ( Byeong Ho Kim ),박익민 ( Ik Min Park ),박용호 ( Yong Ho Park ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.6
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 Mg2Sn 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/Mg2Sn interface and propagation went into α-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/Mg2Sn interface to α-Mg/M2Sng interface in lamellar structure. Preferentially corrosion of α-Mg/M2Sn interface in lamellar structure impeded corrosion propagation went into α-Mg.