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Citation: CHANG Xiao-Tu, WANG Jian-Ming, SHAO Hai-Bo, WANG Jun-Bo, ZENG Xiao-Xu, ZHANG Jian-Qing, CAO Chu-Nan. Corrosion and Anodic Behaviors of Pure Aluminumin a Novel Alkaline Electrolyte[J]. Acta Physico-Chimica Sinica, ;2008, 24(09): 1620-1624. doi: 10.1016/S1872-1508(08)60067-4 shu

Corrosion and Anodic Behaviors of Pure Aluminumin a Novel Alkaline Electrolyte

1.
Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China; State Key Laboratory for Corrosion and Protection of Metal, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Received Date: 16 May 2008
Available Online: 18 July 2008

The corrosion and anodic dissolution behaviors of pure aluminumin Na2SnO3-containing 4 mol·L-1 KOH methanol-water mixed solutions with a methanol/water volume ratio of 4:1 were investigated. This was carried out by means of hydrogen collection, polarization curve, galvanostatic discharge, scanning electron microscopy (SEM), and energy dispersive analysis of X-ray (EDAX). The experimental results indicated that the addition of stannate inhibited the corrosion of aluminum in the 4 mol·L-1 KOH methanol-water solutions by the deposition of tin with a higher hydrogen evolution overpotential on the electrode surface. In the electrolytes with higher stannate contents the inhibiting effect decreased because of the occurrence of some cracks on the tin deposition film. The results of galvanostatic discharge showed that the discharge of aluminum in the Na2SnO3-containing 4 mol·L-1 KOH methanol-water solutions were obviously improved. In addition, the improvement effect enhanced with the increase of stannate content. It was noted that the aluminum anode showed a very flat discharge plateau at relatively low potentials in the electrolyte with 10.0 mmol·L-1 Na2SnO3 at 20 mA·cm-2 discharge current density.
- Aluminum,
- Corrosion,
- Stannate,
- Discharge,
- KOH methanol-water mixed solution
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