Role of Sn in corrosion and passive behavior of extruded Mg-5 wt%Sn alloy
By Heon-Young Ha and Jun-Yun Kang and Jie Yang and Chang Dong Yim and Bong Sun You
Published in Corrosion Science
2016
Abstract
Corrosion behavior of extruded Mg and Mg5Sn (in wt%) alloy was investigated, and a passivated surface of the Mg5Sn was examined. Immersion test in a 0.6 M NaCl solution revealed that corrosion of the Mg was significantly faster than the Mg5Sn alloy, and vigorous \H2\ evolution was accompanied with the severe corrosion of Mg. Polarization tests confirmed that cathodic reaction was inhibited in the Mg5Sn alloy. It was considered that the decreased \H2\ evolution of the Mg5Sn alloy was attributed to the formation of Sn-accumulated layer between the passive film and matrix, which was examined by an \XPS\ analysis.