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Journal of Chinese Society for Corrosion and protection  2023, Vol. 43 Issue (5): 1071-1078    DOI: 10.11902/1005.4537.2022.356
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Effect of Zn Content on Electrochemical Properties of Al-Zn-In-Mg Sacrificial Anode Alloy
LUO Weihua, WANG Haitao(), YU Lin, XU Shi, LIU Zhaoxin, GUO Yu, WANG Tingyong
SunRui Marine Environment Engineering Company Ltd., Qingdao 266101, China
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Abstract  

Al-Zn-0.03In-1.30Mg sacrificial anode alloys with various Zn contents were designed and prepared. The effect of Zn content on the electrochemical properties of the Al-Zn-0.03In-1.30Mg anode alloys were investigated by AC impedance spectroscopy, galvanostatic- and potentiodynamic-polarization measurements. While the effect of Zn content on the microstructure and corrosion morphology of the alloys were analyzed by metallographic microscope, scanning electron microscope (SEM) and energy dispersive analysis (EDS). The results showed that with the increasing Zn content the grain size of Al-Zn-0.03In-1.30Mg alloys became finer with more uniform microstructure, whilst the free-corrosion current density shifted significantly in the negative direction. The addition of 0.60%-10.00% (mass fraction) Zn could effectively destroy the passive film on the alloy surface and improve the dissolution morphology of the anode alloy. But when the content of Zn excesses 5.00%, dendrites were generated, which would increase local corrosion tendency to make the alloy dissolve ununiformly with decreasing electrochemical properties. The anode alloys with 0.60%~2.00%Zn all exhibited high electrochemical performance, of which the surface dissolved uniformly with a capacity over 2570 A·h·kg-1, and the working potential lower than -1.05 V (vs SCE). The anode alloy with 0.60% Zn could significantly reduce the heavy metal Zn pollution to the marine environment. Therefore, it could be used as environment-friendly sacrificial anode material.
Key words:  aluminum alloy sacrificial anode      corrosion      current efficiency      EIS      microstructure     
Received:  17 November 2022      32134.14.1005.4537.2022.356
ZTFLH:  TG174.41  
Corresponding Authors:  WANG Haitao, E-mail: wanght@sunrui.net   
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LUO Weihua
WANG Haitao
YU Lin
XU Shi
LIU Zhaoxin
GUO Yu
WANG Tingyong

Cite this article: 

LUO Weihua, WANG Haitao, YU Lin, XU Shi, LIU Zhaoxin, GUO Yu, WANG Tingyong. Effect of Zn Content on Electrochemical Properties of Al-Zn-In-Mg Sacrificial Anode Alloy. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1071-1078.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.356     OR     https://www.jcscp.org/EN/Y2023/V43/I5/1071

No.ZnInMgAl
1#-0.03191.1966Bal.
2#0.20800.02681.1488Bal.
3#0.61190.02901.2212Bal.
4#2.09370.03071.0904Bal.
5#5.14670.03101.1054Bal.
6#9.93470.03301.1804Bal.
Table 1  Composition of Al-Zn-0.03In-1.30Mg anode
Fig.1  Circuit diagram of test device
Time / hCurrent density / mA·cm-2
0-241.5
24-480.4
48-724.0
72-961.5
Table 2  Current density of 4d experiment
Fig.2  Metallographic structure of Al-Zn-0.03In-1.30Mg anode with Zn content of 0 (a), 0.20% (b), 0.60% (c), 2.00% (d), 5.00% (e) and 10.00% (f)
No.CompositionOCP/VClosed-circuit potential (96 h) / VCapacity / A·h·kg-1Current efficiency
1#Al-0.03In-1.30Mg-1.14-0.86266590%
2#Al-0.20Zn-0.03In-1.30Mg-1.11-1.09279594%
3#Al-0.60Zn-0.03In-1.30Mg-1.10-1.13257887%
4#Al-2.00Zn-0.03In-1.30Mg-1.10-1.12257388%
5#Al-5.00Zn-0.03In-1.30Mg-1.07-1.09247987%
6#Al-10.00Zn-0.03In-1.30Mg-1.09-1.06231084%
Table 3  Experimental results of electrochemical performance of Al-Zn-0.03In-1.30Mg anode
Fig.3  Dissolution morphology of Al-Zn-0.03In-1.30Mg anode with Zn content of 0 (a), 0.20% (b), 0.60% (c), 2.00% (d), 5.00% (e) and 10.00% (f)
Fig.4  EDS diagram of Al-Zn-0.03In-1.30Mg anode with Zn content of 0.60% (a), 2.00% (b) and 10.00% (c)
Fig.5  Anode polarization curves of Al-Zn-0.03In-1.30Mg anode
No.Compositionba / mV·dec-1Ecorr / VIcorr / A·cm-2
1#Al-0.03In-1.30Mg227-1.011.22×10-6
2#Al-0.20Zn-0.03In-1.30Mg156-1.071.18×10-6
3#Al-0.60Zn-0.03In-1.30Mg82-1.181.13×10-6
4#Al-2.00Zn-0.03In-1.30Mg57-1.215.36×10-7
5#Al-5.00Zn-0.03In-1.30Mg48-1.172.09×10-7
6#Al-10.00Zn-0.03In-1.30Mg47-1.203.45×10-7
Table 4  Fitting results of polarization curves
Fig.6  Nyquist plot of Al-Zn-0.03In-1.30Mg anode
No.Composition

Rs

Ω·cm2

CPE

Ω-1·cm2·s-1

n

0＜n＜1

Rt

Ω·cm2

L

H·cm2

R1

Ω·cm2

1#Al-0.03In-1.30Mg1.581.89×10-50.882.01×104//
2#Al-0.20Zn-0.03In-1.30Mg1.783.54×10-50.801.95×104//
3#Al-0.60Zn-0.03In-1.30Mg2.402.81×10-50.823.83×1031402758
4#Al-2.00Zn-0.03In-1.30Mg1.623.37×10-50.842.03×103847939
5#Al-5.00Zn-0.03In-1.30Mg1.742.56×10-50.843.60×1036631786
6#Al-10.00Zn-0.03In-1.30Mg1.693.42×10-50.821.91×10314931393
Table 5  Fitting values of Al-Zn-0.03In-1.30Mg anode derived from EIS curves
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