Effect of Sn, Zn and Bi Addition on Corrosion Characteristics of Magnesium Alloys Sintered by Spark Plasma Sintering

Satoshi Sunada; Yoshitaka Matsui; Syogo Takeuchi; Taku Iwaoka; Koichi Sato; Masahiko Hatakeyama

doi:10.4028/www.scientific.net/MSF.941.1760

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Effect of Sn, Zn and Bi Addition on Corrosion...

Effect of Sn, Zn and Bi Addition on Corrosion Characteristics of Magnesium Alloys Sintered by Spark Plasma Sintering

Abstract:

Sintered magnesium alloys, which were fabricated by Spark Plasma Sintering (SPS) method, were examined to study corrosion characteristics by electrochemical method, XRD and EPMA. The binary mixtures alloys of a low-melting-point metal powder (Sn, Bi, Sb) of1.0 vol.% and the pure magnesium powder were prepared. In the Mg-1.0vol.%Bi and Mg-1.0vol.%Sn, Mg₃Bi₂ and Mg₂Sn precipitates was recognized by XRD, respectively. In addition, formation of oxide along powder particle boundaries was observed by EPMA elemental mapping in all specimens. In the case of Mg-1.0vol.%Zn, precipitation of metallic compounds was not recognized by these experiments. According to the results of polarization curve measurements, the Mg-1.0vol.%Bi shows highest corrosion potential. However, corrosion rate which was estimated by Tafel method is relatively larger than other alloys due to Mg₃Bi₂ precipitation. This result suggests that Mg₃Bi₂ acts as cathode site. The Mg-1.0vol.%Sn shows superior corrosion rale in these alloys.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

1760-1765

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.1760

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Online since:

December 2018

Authors:

Satoshi Sunada, Yoshitaka Matsui, Syogo Takeuchi, Taku Iwaoka, Koichi Sato, Masahiko Hatakeyama*

Keywords:

Corrosion, Magnesium, Sintered Material

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