腐蚀形貌对镁合金电化学阻抗谱特征的影响研究

doi:10.11902/1005.4537.2025.011

中国腐蚀与防护学报

2025, Vol. 45

Issue (6): 1589-1598 CSTR: 32134.14.1005.4537.2025.011 DOI: 10.11902/1005.4537.2025.011

研究报告

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腐蚀形貌对镁合金电化学阻抗谱特征的影响研究

许诗源¹, 孟鑫², 杨亚璋¹, 刘辰¹, 张昭³, 方晓祖¹(

)

1 中国兵器科学研究院宁波分院宁波 315000
2 重庆铁马工业集团有限公司重庆 400000
3 浙江大学化学系杭州 310000

Effect of Corrosion Morphology on Electrochemical Impedance Spectroscopy Characteristics of Mg-alloy

XU Shiyuan¹, MENG Xin², YANG Yazhang¹, LIU Chen¹, ZHANG Zhao³, FANG Xiaozu¹(

)

1 Ningbo branch of Chinese Academy of Ordnance Science, Ningbo 315000, China
2 Chongqing Tiema Industrial Group Co. Ltd. , Chongqing 400000, China
3 Department of Chemistry, Zhejiang University, Hangzhou 310000, China

引用本文:

许诗源, 孟鑫, 杨亚璋, 刘辰, 张昭, 方晓祖. 腐蚀形貌对镁合金电化学阻抗谱特征的影响研究[J]. 中国腐蚀与防护学报, 2025, 45(6): 1589-1598.
Shiyuan XU, Xin MENG, Yazhang YANG, Chen LIU, Zhao ZHANG, Xiaozu FANG. Effect of Corrosion Morphology on Electrochemical Impedance Spectroscopy Characteristics of Mg-alloy[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1589-1598.

全文: PDF(18614 KB) HTML

摘要:

为研究镁合金电化学阻抗谱中双感抗弧现象的形成机理，本研究选择均匀腐蚀为主的纯镁和局部腐蚀为主的AZ31镁合金样品作为对比样本。在质量分数为3.5%NaCl溶液中浸泡24 h后，电化学阻抗谱测试显示：纯镁样品未出现双感抗弧现象；而AZ31镁合金样品表现出明显的双感抗弧现象。进一步对样品的腐蚀形貌的分析表明：纯镁样品表面形成了较为均匀的腐蚀形貌；而AZ31镁合金同时遭受丝状腐蚀和点蚀，丝状腐蚀和点蚀不同的扩展方式导致样品表面形成了不均匀的腐蚀形貌。电化学阻抗谱与腐蚀形貌特征的分析结果表明镁合金样品中双感抗弧现象的形成与其不均匀的腐蚀形貌有关。

关键词 ：镁合金, 腐蚀, 电化学阻抗谱, 腐蚀形貌

Abstract：

In order to investigate the formation mechanism of dual inductive loops in electrochemical impedance spectroscopy (EIS) of Mg-alloy, the corrosion behavior in 3.5% (mass fraction) NaCl solution of pure Mg (exhibiting uniform corrosion) and AZ31 Mg-alloy (predominantly undergoing localized corrosion) was comparatively assessed. After immersion in 3.5% (mass fraction) NaCl solution for 24 h, the EIS test results revealed that the pure Mg did not exhibit dual inductive loops. However, the dual inductive loops can be observed for AZ31 Mg-alloy. Morphological analysis further demonstrated that the pure Mg did experience uniform corrosion. However, AZ31 Mg-alloy suffered from both filiform corrosion and pitting corrosion. The different propagation mechanism of filiform corrosion and pitting corrosion led to the formation of non-uniform corrosion morphology. The test results of EIS and corrosion morphology established that the formation of double induction loops for AZ31 Mg-alloy is related to the non-uniform corrosion morphology.

Key words： Mg-alloys corrosion EIS corrosion morphology

收稿日期: 2025-01-06 32134.14.1005.4537.2025.011

ZTFLH:

T146.2

基金资助:宁波市青年科技创新领军人才项目(2024QL010);中国创新挑战(宁波)重大专项(2023T001)

通讯作者: 方晓祖，E-mail：nbbkycorrosion2024@163.com，研究方向为海洋及两栖装备的腐蚀与防护技术

Corresponding author: FANG Xiaozu, E-mail: nbbkycorrosion2024@163.com

作者简介: 许诗源，男，1989年生，博士

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https://www.jcscp.org/CN/10.11902/1005.4537.2025.011 或 https://www.jcscp.org/CN/Y2025/V45/I6/1589

表1 实验用镁合金化学成分 (mass fraction / %)

图1 纯镁和AZ31镁合金样品的背散射照片

表2 AZ31镁合金样品不同区域的EDS分析结果 (atomic fraction / %)

图2 纯镁和AZ31镁合金样品3.5%NaCl溶液中浸泡24 h后的电化学阻抗谱测试结果

图3 纯镁和AZ31镁合金样品在3.5%NaCl溶液中浸泡24 h后的光学形貌

图4 纯镁样品腐蚀形貌的SEM形貌

图5 AZ31镁合金样品去除腐蚀产物后的腐蚀形貌

图6 AZ31镁合金样品在3.5%NaCl溶液中浸泡24 h后截面形貌

表3 纯镁和AZ31镁合金样品腐蚀产物的EDS测试结果 (atomic fraction / %)

图7 纯镁和AZ31镁合金腐蚀产物XRD谱

图8 纯镁样品和AZ31镁合金样品等效电路

图9 AZ31镁合金样品浸泡10 min后的腐蚀形貌SEM图

图10 AZ31镁合金样品浸泡30 min后的腐蚀形貌SEM图

图11 AZ31镁合金腐蚀过程示意图

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