AZ91D镁合金和2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为研究

doi:10.11902/1005.4537.2021.355

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 1016-1026 DOI: 10.11902/1005.4537.2021.355

研究报告

本期目录 | 过刊浏览

AZ91D镁合金和2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为研究

刘泽琪, 何潇潇, 祁康, 黄华良(

)

武汉工程大学化学与环境工程学院武汉 430205

Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution

LIU Zeqi, HE Xiaoxiao, QI Kang, HUANG Hualiang(

)

School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China

引用本文:

刘泽琪, 何潇潇, 祁康, 黄华良. AZ91D镁合金和2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为研究[J]. 中国腐蚀与防护学报, 2022, 42(6): 1016-1026.
Zeqi LIU, Xiaoxiao HE, Kang QI, Hualiang HUANG. Galvanic Corrosion Behavior for Galvanic Couple of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl Solution[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 1016-1026.

全文: PDF(9168 KB) HTML

摘要:

采用电化学方法和表面分析技术研究了AZ91D镁合金与2002铝合金在0.5 mg/L NaCl溶液中的电偶腐蚀行为。对于镁合金,耦合后始终为阳极,腐蚀电位正移,腐蚀速率增加,这可能归结为它们之间的电偶效应显著加速了其阴极过程。对于铝合金,耦合后始终为阴极,腐蚀电位也正移,腐蚀速率增加,这可能归结为它们之间的电偶效应抑制了其表面钝化膜的形成。随着浸泡时间的延长,它们之间的耦合电位先正移后逐渐负移,电偶电流密度先增加后减小,最后逐渐增加并达到相对稳定的状态。为汽车发动机材料的选择、设计及其电偶腐蚀的抑制提供基本理论依据。

关键词 ： AZ91D镁合金, 2002铝合金, 电偶腐蚀, SEM, XPS

Abstract：

The galvanic corrosion behavior for the galvanic pair of AZ91D Mg-alloy/2002 Al-alloy in 0.5 mg/L NaCl solution was studied by means of electrochemical methods and surface analysis techniques. For the galvanic pair of AZ91D Mg-alloy/2002 Al-alloy in the NaCl solution, Mg-alloy always acted as anode, thus its corrosion potential positively shifted, while corrosion rate increased. This could be attributed to that the galvanic effect between the two alloys significantly accelerated its cathode process. On the other hand, Al-alloy, always acted as cathode, its corrosion potential also positively shifted, and the corrosion rate increased. This could be ascribed to that the galvanic effect between the two alloys inhibited the formation of the passivation film on its surface. With the extension of immersion time, the coupling potential of the two alloys shifted towards positive first and then gradually negative, and finally reached a relatively stable state. The galvanic current densities increased first and then decreased and increased gradually again, and finally reached a relatively stable state. The research results not only enriched the knowledge of galvanic corrosion, but also provided a theoretical basis for the selection and design of automotive engine materials and the inhibition of the galvanic corrosion of multi-metal pairs.

Key words： AZ91D Mg-alloy 2002 Al-alloy galvanic corrosion SEM XPS

收稿日期: 2021-12-10

ZTFLH:

TG174

基金资助:国家自然科学基金(51401151);湖北省自然科学基金(2018CFB525);武汉工程大学研究生创新基金(CX2021345);武汉工程大学校长基金(XZJJ2021074)

作者简介: 刘泽琪,女,1996年生,硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.355 或 https://www.jcscp.org/CN/Y2022/V42/I6/1016

图1 30 ℃下0.5 mg/L NaCl溶液中AZ91D镁合金与2002铝合金的电位及电位差随时间的变化

图2 未耦合和耦合后再断开条件下AZ91D镁合金和2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后的极化曲线

表1 未耦合和耦合后再断开条件下AZ91D镁合金和2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后的极化曲线拟合参数

图3 未耦合和耦合后再断开条件下AZ91D镁合金与2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后的电化学阻抗谱

图4 用来拟合测试EIS数据的等效电路

表2 未耦合和耦合后再断开条件下AZ91D镁合金与2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h的EIS拟合结果

图5 耦合后再断开条件下AZ91D镁合金和2002铝合金在30 ℃,0.5 mg/L NaCl溶液中不同浸泡时间的电化学阻抗谱

表3 耦合条件下AZ91D镁合金和2002铝合金在30 ℃,0.5 mg/L NaCl溶液中不同浸泡时间的EIS拟合结果

图6 AZ91D镁合金与2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡96 h后的耦合电位和电偶电流密度随时间的变化曲线

图7 未耦合和耦合条件下AZ91D镁合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后的SEM形貌

图8 未耦合和耦合条件下2002铝合金在30 ℃, 0.5 mg/L NaCl溶液中浸泡24 h后的SEM形貌

图9 耦合条件下AZ91D镁合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后表面膜的XPS谱

图10 耦合条件下2002铝合金在30 ℃,0.5 mg/L NaCl溶液中浸泡24 h后表面膜的XPS谱

图11 AZ91D镁合金与2002铝合金在30 ℃,0.5 mg/L NaCl溶液中的电偶腐蚀机理示意图

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