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Journal of Chinese Society for Corrosion and protection  2016, Vol. 36 Issue (5): 421-426    DOI: 10.11902/1005.4537.2015.207
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Electrochemical Performance of Al-Mg-Sn-Ga Aluminum Anode Alloy
Jingling MA1,2(),Fengzhang REN1,Guangxin WANG1,2,Yi XIONG1,Jiuba WEN1
1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China
2. Research Center for High Purity Materials, Henan University of Science and Technology, Luoyang 471023, China
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Abstract  

In this research, Al-air battery based on Al-0.5Mg-0.1Sn-0.05Ga (mass fraction, %) anodes were set up, and then the electrochemical performance of the alloy, including the as-cast one and the deformed one with 40% reduction, was investigated in 2 mol/L NaCl and 4 mol/L NaOH solutions. The results show that the deformation process can increase the electrochemical activity, while decrease the free-corrosion rate of the alloy. This may be partially ascribed to the grain refinement induced by deformation process. The morphology observation of the alloy after discharge and the measured electrochemical impedance spectroscopy of the alloy proved the corrosion characteristics fairly well. In comparison, the working voltage and the anodic utilization rate of the deformed Al-0.5Mg-0.1Sn-0.05Ga alloy in 2 mol/L NaCl solution are higher than those of Zn in 4 mol/L NaOH solution.
Key words:  aluminum alloy      air battery      deformation      self-corrosion     
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Jingling MA
Fengzhang REN
Guangxin WANG
Yi XIONG
Jiuba WEN

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Jingling MA,Fengzhang REN,Guangxin WANG,Yi XIONG,Jiuba WEN. Electrochemical Performance of Al-Mg-Sn-Ga Aluminum Anode Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 421-426.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.207     OR     https://www.jcscp.org/EN/Y2016/V36/I5/421

Fig.1  Potentiodynamic polarization curves of as-cast and deformation Al-0.5Mg-0.1Sn-0.05Ga alloy and Zn in 2 mol/L NaCl and 4 mol/L NaOH respectively (a) and in 4 mol/L NaOH (b) solutions
Material Solution Ecorr (Hg/HgO)V IcorrmAcm-2 RpΩcm2 Corrosion rate mgcm-2h-1
Al-Mg-Sn-Ga Cast 2 mol/L NaCl -1.40 0.76 67.9 6.27×10-3
Deformation 2 mol/L NaCl -1.43 0.28 106.9 5.63×10-3
Cast 4 mol/L NaOH -1.84 21.25 2.1 62.16
Deformation 4 mol/L NaOH -1.82 10.87 4.1 57.28
Zn Cast 4 mol/L NaOH -1.42 0.45 48.0 11.65
Table 1  Corrosion parameters of as-cast and deformation Al-0.5Mg-0.1Sn-0.05Ga alloy in 2 mol/L NaCl, 4 mol/L NaOH solutions, and Zn in 4 mol/L NaOH solution
Fig.2  Discharge curves of metal-air batteries based on as-cast and 40% deformation Al-0.5Mg-0.1Sn-0.05Ga anodes in 2 mol/L NaCl, 4 mol/L NaOH solutions and on Zn in 4 mol/L NaOH solution at 20 mAcm-2 for 5 h
Material Solution Operating voltage / V Anodic utilization / %
Al-Mg-Sn-Ga Cast 2 mol/L NaCl 1.13 67.8
Deformation 2 mol/L NaCl 1.16 68.9
Cast 4 mol/L NaOH 1.18 22.9
Deformation 4 mol/L NaOH 1.37 25.1
Zn Cast 4 mol/L NaOH 1.01 19.7
Table 2  Discharge performances of metal-air batteries with different anodes
Fig.3  Corrosion micrographs of as-cast (a, c) and deformed (b, d) Al-0.5Mg-0.1Sn-0.05Ga alloy after discharg in 2 mol/L NaCl (a, b) and 4 mol/L NaOH (c, d) solutions and Zn in 4 mol/L NaOH solution (e)
Fig.4  Measured and fitted EIS curves of Al-0.5Mg-0.1Sn-0.05Ga alloy and Zn in 2 mol/L NaCl (a) and 4 mol/L NaOH (b) solutions
Fig.5  Equivalent circuits of as-cast and deformation Al-0.5Mg-0.1Sn-0.05Ga alloy in 2 mol/L NaCl (a) and 4 mol/L NaOH (b) solutions, and Zn in 4 mol/L NaOH solution (b)
Anode Solution L10-7 Hcm2 RsΩcm2 CPE110-4 Fcm-2 n10<n<1 RtΩcm2 CPE210-3 Fcm-2 n20<n<1 R2Ωcm2 L110-3 Hcm2 R1Ωcm2 x2
Al alloy cast 2 mol/L NaCl --- 7.86 30.35 0.84 930 4.25 0.80 64 --- --- 1.48×10-3
Al alloy deformation 2 mol/L NaCl --- 5.38 43.69 0.90 451 0.47 0.61 152 --- --- 5.23×10-4
Al alloy cast 4 mol/L NaOH 10.88 2.93 85.87 0.80 0.36 --- --- --- 29.13 0.06 5.97×10-5
Al alloy deformation 4 mol/L NaOH 11.73 1.65 56.71 0.35 1×10-7 --- --- --- 48.08 0.10 7.37×10-5
Zn 4 mol/L NaOH 11.99 1.87 81.09 0.60 4.43 --- --- --- 22.78 1.55 1.41×10-3
Table 3  EIS simulated values of as-casted and deformation Al-0.5Mg-0.1Sn-0.05Ga alloy and Zn
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