交流电场与液膜厚度对A6082-T6铝合金腐蚀行为的影响

doi:10.11902/1005.4537.2019.234

中国腐蚀与防护学报

2020, Vol. 40

Issue (4): 342-350 DOI: 10.11902/1005.4537.2019.234

研究报告

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交流电场与液膜厚度对A6082-T6铝合金腐蚀行为的影响

胡露露¹, 赵旭阳², 刘盼¹, 吴芳芳², 张鉴清¹, 冷文华¹(

), 曹发和¹^,³(

)

1.浙江大学化学系杭州 310027
2.浙江华电器材检测研究所有限公司浙江省高处作业防护技术研究重点实验室杭州 310015
3.中山大学材料学院广州 510006

Effect of AC Electric Field and Thickness of Electrolyte Film on Corrosion Behavior of A6082-T6 Al Alloy

HU Lulu¹, ZHAO Xuyang², LIU Pan¹, WU Fangfang², ZHANG Jianqing¹, LENG Wenhua¹(

), CAO Fahe¹^,³(

)

1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China
2. Key Laboratory for Protection Technology of High-Rise Operation, Zhejiang Huadian Equipment Testing Institute Co. Ltd. , Hangzhou 310015, China
3. School of Materials, Sun Yat-sen University, Guangzhou 510006, China

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摘要:

采用电化学阻抗谱、开路电位测试和阴极极化曲线，结合扫描电镜成像分析，研究了模拟大气环境不同液膜厚度和交流电场对A6082-T6铝合金腐蚀行为的影响。结果表明:降低液膜厚度加速了铝合金A6082-T6的腐蚀，交流电场显著改变了铝合金局部腐蚀形态，从大量点蚀转变成出现严重的剥蚀。

关键词 ：交流电场, 液膜厚度, 铝合金, 腐蚀行为, 电化学阻抗谱, 微观形貌

Abstract：

The effect of alternating electric field on the corrosion behavior of A6082-T6 Al-alloy in an artificial atmospheric environment, namely, an electrolyte film on the surface of Al-alloy is studied by means of electrochemical impedance spectroscopy, open circuit potential and cathodic polarization curve measurements, as well as scanning electron microscopy. The results show that, with the decreasing of thickness of electrolyte film, the corrosion rate of A6082-T6 Al-alloy was accelerated. Meanwhile, the applied AC electric field could clearly alter the morphology of localized corrosion type of A6082-T6 Al-alloy, namely transformed from pitting corrosion with a large number of pits to serious exfoliation corrosion.

Key words： alternating electric field thickness of electrolyte layer aluminum alloy corrosion behavior EIS microscopic morphology

收稿日期: 2019-11-25

ZTFLH:

TG172

基金资助:国家自然科学基金(51771174);国家材料腐蚀与防护科学数据中心资助

通讯作者: 冷文华,曹发和 E-mail: lengwh@zju.edu.cn;caofh5@mail.sysu.eud.cn

Corresponding author: LENG Wenhua,CAO Fahe E-mail: lengwh@zju.edu.cn;caofh5@mail.sysu.eud.cn

作者简介: 胡露露，女，1993年生，硕士生

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引用本文:

胡露露, 赵旭阳, 刘盼, 吴芳芳, 张鉴清, 冷文华, 曹发和. 交流电场与液膜厚度对A6082-T6铝合金腐蚀行为的影响[J]. 中国腐蚀与防护学报, 2020, 40(4): 342-350.
Lulu HU, Xuyang ZHAO, Pan LIU, Fangfang WU, Jianqing ZHANG, Wenhua LENG, Fahe CAO. Effect of AC Electric Field and Thickness of Electrolyte Film on Corrosion Behavior of A6082-T6 Al Alloy. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 342-350.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.234 或 https://www.jcscp.org/CN/Y2020/V40/I4/342

图1 外加交流电场的薄液膜装置示意图

图2 A6082-T6铝合金在本体溶液以及典型薄液膜厚度溶液中浸泡72 h的Nyquist和Bode图

图3 铝合金A6082-T6在3.5%NaCl溶液中电化学阻抗谱拟合用等效电路图

图4 A6082-T6铝合金在含3.5%NaCl不同厚度薄液膜下电化学阻抗谱拟合的Rct及Rf+Rct的变化曲线

图5 在本体3.5%NaCl溶液及不同厚度薄液膜体系中浸泡20 min后施加不同交流电场对A6082-T6铝合金开路电位的影响

图6 不同交流电场下铝合金在3.5%NaCl本体溶液和不同厚度薄液膜下的阴极极化曲线和-1.0 V极限扩散电流

图7 A6082-T6铝合金在3.5%NaCl本体溶液及不同厚度薄液膜下浸泡72 h后的SEM像和薄液膜厚度为160 μm下的EDS结果

图8 A6082-T6铝合金在外加20 kV/m的交流电场下3.5%NaCl本体溶液及不同厚度薄液膜下浸泡12 h后的SEM像和液膜厚度为250 μm时样品的EDS结果

图9 A6082-T6铝合金在外加60 kV/m交流电场的3.5%NaCl本体溶液及不同厚度薄液膜下浸泡12 h后的SEM像和液膜厚度为150 μm时样品的EDS结果

图10 A6082-T6铝合金在外加100 kV/m的交流电场下3.5%NaCl本体溶液及不同厚度薄液膜下浸泡12 h后的SEM像和在本体溶液中浸泡样品的EDS结果

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