Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Improvement of Corrosion Resistance and Adhesion of Coating Layer for Magnesium Alloy Coated with High Purity Magnesium
Shinji FukumotoKana SugaharaAtsushi YamamotoHarushige Tsubakino
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2003 Volume 44 Issue 4 Pages 518-523


AZ31 magnesium alloy was coated with high purity magnesium by vapor deposition coating process at high temperature in order to improve the corrosion resistance. Interdiffusion of each element was observed at the interface during the deposition coating process. The high purity magnesium coating showed superior corrosion resistance in salt solution. Although corrosion resistance was improved dramatically by the vapor deposition coating process, there were a lot of voids and pin-holes at the interface and in the coating layer, respectively. Hot press and HIP processes were carried out to decrease the voids and pin-holes. They were disappeared completely by hot press and HIP processes, resulting in improvement of adhesion property. Moreover, corrosion resistance was also improved due to disappearance of voids and pin-holes. Besides, the high purity magnesium coating worked as sacrificial anode in the cross cut test, resulting in protecting the substrate.

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© 2003 The Japan Institute of Metals and Materials
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