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中国腐蚀与防护学报  2023, Vol. 43 Issue (5): 1071-1078     CSTR: 32134.14.1005.4537.2022.356      DOI: 10.11902/1005.4537.2022.356
  研究报告 本期目录 | 过刊浏览 |
Zn含量对Al-Zn-In-Mg牺牲阳极电化学性能的影响
罗维华, 王海涛(), 于林, 许实, 刘朝信, 郭宇, 王廷勇
青岛双瑞海洋环境工程股份有限公司 青岛 266101
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
全文: PDF(9106 KB)   HTML
摘要: 

设计并制备了不同Zn含量的Al-Zn-0.03In-1.30Mg牺牲阳极材料，采用恒电流、动电位极化和电化学阻抗谱方法研究了Zn含量对Al-Zn-0.03In-1.30Mg阳极电化学性能的影响，采用金相显微镜、扫描电子显微镜 (SEM) 和能谱 (EDS) 分析Zn含量对阳极的显微组织与腐蚀形貌的影响。结果表明：随着Zn含量的升高，Al-Zn-0.03In-1.30Mg阳极晶粒更细化且金相组织更均匀，自腐蚀电位显著负移；添加0.60%~10.00% (质量分数) 的Zn可以有效破坏阳极表面的钝化膜从而改善阳极的溶解形貌，但Zn含量大于5.00%时，阳极会产生枝晶，增加局部腐蚀倾向使阳极溶解不均匀、电化学性能降低，0.60%~2.00%Zn含量阳极均具有较高的电化学性能，阳极的表面溶解均匀，电容量在2570 A·h·kg-1以上，工作电位≤-1.05 V (vs SCE)；其中0.60%Zn含量阳极能够显著降低牺牲阳极材料中Zn对海洋环境的重金属污染，可作为环保型牺牲阳极材料使用。
关键词 ： 铝合金牺牲阳极,  腐蚀,  电流效率,  EIS,  显微组织    
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
收稿日期: 2022-11-17      32134.14.1005.4537.2022.356
ZTFLH:  TG174.41  
通讯作者: 王海涛，E-mail: wanght@sunrui.net，研究方向为海洋工程装备腐蚀与防护   
Corresponding author: WANG Haitao, E-mail: wanght@sunrui.net   
作者简介: 罗维华，男，1995年生，硕士生
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引用本文:

罗维华, 王海涛, 于林, 许实, 刘朝信, 郭宇, 王廷勇. Zn含量对Al-Zn-In-Mg牺牲阳极电化学性能的影响[J]. 中国腐蚀与防护学报, 2023, 43(5): 1071-1078.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.356      或      https://www.jcscp.org/CN/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.
表1  Al-Zn-0.03In-1.30Mg阳极成分 (mass fraction / %)
图1  实验装置电路图
Time / hCurrent density / mA·cm-2
0-241.5
24-480.4
48-724.0
72-961.5
表2  4d法电流密度
图2  不同Zn含量Al-Zn-0.03In-1.30Mg阳极金相组织
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%
表3  Al-Zn-0.03In-1.30Mg阳极电化学性能实验结果
图3  Al-Zn-0.03In-1.30Mg阳极溶解形貌
图4  Al-Zn-0.03In-1.30Mg阳极表面EDS能谱
图5  Al-Zn-0.03In-1.30Mg阳极极化曲线
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
表4  极化曲线拟合结果
图6  Al-Zn-0.03In-1.30Mg阳极的EIS图
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
表5  电化学阻抗拟合值
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