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| Corrosion Resistance to Alkali Metal Penetration of TiB2 Based Composite Cathode for Aluminum Electrolysis |
| Received:November 10, 2011 Revised:November 10, 2011 |
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| DOI： |
| KeyWord:aluminum electrolysis; [K3AlF6/Na3AlF6]-AlF3-Al2O3 melts; composite cathode; electrolysis expansion |
| Author | Institution |
| 方 钊，胥 建，侯金龙，李林波，朱 军 |
1.西安建筑科技大学 冶金工程学院, 西安 ;2.中南大学 冶金科学与工程学院, 长沙 |
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| Abstract: |
| Corrosion resistance to alkali metal penetration of TiB2-C composite cathodes, which are using pitch, furan, phenolic aldehyde and epoxy as binder, in low temperature electrolyte([K3AlF6/Na3AlF6]-AlF3-Al2O3) were tested and the element distribution and morphology of radial sections of samples after electrolysis were also investigated. The results indicate that electrolysis expansion of pitch based TiB2-C composite cathode is maximal, while TiB2-C composite cathode using epoxy as binder has the minimal electrolysis expansion. Furthermore, each binder has the first-rank addition, corresponding to its own minimum expansion after electolysis. The first-rank addition(mass percent) of pitch, furan, phenolic aldehyde, and epoxy are 16%, 18%, 14% and 12% severally. In this case, electrolysis expansion of corresponding cathodes are 1.49%,1.26%,1.18% and 0.92% respectively. At this circumstance, electrolysis expansion of TiB2-C composite cathodes are 1.49%,1.26%,1.18% |
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