| MA Zheng-qing,PANG Xu,ZUO Lie,CAO Lin,ZENG Su-min.Mechanism of Activation of Anode of Mg Alloy Seawater Battery[J],37(1):5-7 |
| Mechanism of Activation of Anode of Mg Alloy Seawater Battery |
| Received:August 23, 2007 Revised:February 10, 2008 |
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| DOI： |
| KeyWord:Seawater Bttery Magnesium anode Dot corrosion Mechanism of activation |
| Author | Institution |
| MA Zheng-qing |
College of Materials Science and Engineering, Central South University, Changsha , China |
| PANG Xu |
College of Materials Science and Engineering, Central South University, Changsha , China |
| ZUO Lie |
College of Materials Science and Engineering, Central South University, Changsha , China |
| CAO Lin |
College of Materials Science and Engineering, Central South University, Changsha , China |
| ZENG Su-min |
College of Materials Science and Engineering, Central South University, Changsha , China |
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| Abstract: |
| A novel Mg-Hg-X alloy anode was made. The microscopic structure, surface appearance, the composition of surface element of Mg-Hg-X alloy anodes have been studied by SEM, XRD and electrochemical techniques. Anodic dissolution and mechanism of activation of Mg alloy anode have been researched. The results show that : at the initial-stages, the Mg-Hg-X alloy anode appears dot corrosion by doping Hg, X which formed micro-battery with Mg, because of the second phase particles shedded with the dissolve of Mg and forming the corrosion pits. Then the Hg2+ , X3+ was deoxidized by Mg and deposited at the surface of the Mg alloy in form of Hg,X coating. The successive oxide film is destroyed by the sediment of Hg,X. The polarization of Mg-Hg-X alloy anodes is decreased, the electrode potential shifts negative and the self-corrosion rate is reduced because of the high hydrogen evolution over-potential Hg, X coating covering on the surface of the Mg alloy. |
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