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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (1): 69-74    DOI: 10.11902/1005.4537.2013.279
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Current Efficiency and Corrosion Mechanism of Al-Zn-In Sacrificial Anode at Different Current Densities
ZHAO Guoqiang, WEI Yinghua(), LI Jing
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
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Abstract  

The current efficiency and corrosion mechanism of Al-Zn-In sacrificial anode by different impressed current densities were investigated by using electrochemical methods. Results showed that the corrosion mechanism and the current efficiency of the Al-Zn-In sacrificial anode varied with the impressed current densities. The current efficiency decreases dramatically by a low current density, this may be caused by the fact that the re-deposition of the dissolved cations (In3+, Zn2+) was suppressed and an oxides film might formed on the alloy surface. A mass loss of the anode might be caused by the cracking and dissolving of the oxides film, and this might be responsible to the current efficiency of Al-Zn-In sacrificial anode lower than that theoretically expected by the low impressed current density.
Key words:  Al-Zn-In sacrificial anode      working current density      current efficiency      corrosion mechanism     
ZTFLH:  TG174.1  
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Guoqiang ZHAO
Yinghua WEI
Jing LI

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ZHAO Guoqiang, WEI Yinghua, LI Jing. Current Efficiency and Corrosion Mechanism of Al-Zn-In Sacrificial Anode at Different Current Densities. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 69-74.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.279     OR     https://www.jcscp.org/EN/Y2015/V35/I1/69

Fig.1  Current efficiency of Al-Zn-In sacrificial anode at different working current densities
Current density / mAcm-2 Average mass loss / mg Average electric quantity / Ah Average current efficiency / %
0.005 7.70 3.48×10-3 16.73
0.01 19.90 8.07×10-3 16.20
0.1 39.30 64.09×10-3 60.40
0.7 269.60 0.54 74.16
1 285.95 0.67 86.17
2.5 556.30 1.27 84.33
Table 1  Average values of mass loss, electric quantity and current efficiency of Al-Zn-In sacrificial anode at different working current densities
Fig.2  Polarization curve of Al-Zn-In sacrificial anode in artificial seawater
Fig.3  Nyquist plot of Al-Zn-In sacrificial anode at self-corrosion state
Fig.4  Nyquist plots of Al-Zn-In sacrificial anode at polarization current of 0.005 mA (a), 0.01 mA (b), 0.05 mA (c), 0.1 mA (d), 0.5 mA (e) and 1 mA (f)
Current density
mAcm-2 		Equivalent capacit-ance / Fcm-2 Thickness of
oxide film / m
0.005 1.50×10-5 5.90×10-10
0.01 1.94×10-5 4.56×10-10
0.05 4.68×10-5 1.89×10-10
0.1 1.30×10-4 4.50×10-11
0.5 1.02×10-4 5.80×10-11
1 1.15×10-4 5.13×10-11
Table 2  Calculated values of oxide film at different current densities
Fig.5  Calculated values of oxide film at different current densities
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