铝合金表面有机硅环氧涂层的腐蚀电化学行为

doi:10.11902/1005.4537.2013.136

中国腐蚀与防护学报

2014, Vol. 34

Issue (4): 375-381 DOI: 10.11902/1005.4537.2013.136

论文

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铝合金表面有机硅环氧涂层的腐蚀电化学行为

元辛, 岳珠峰, 温世峰, 李磊

西北工业大学力学与土木建筑学院先进材料测试中心西安 710129

Electrochemical Corrosion Behavior of Silicone-epoxy Hybrid Coatings on LY12 Aluminum Alloy Electrode

YUAN Xin, YUE Zhufeng, WEN Shifeng, LI Lei

Advanced Material Test Center, School of Mechanics and Civil & Architecture, Northwestern Politechnical University, Xi'an 710129, China

全文: PDF(3194 KB)

摘要: 研究了铝合金/有机硅环氧涂层电极在5%NaCl (质量分数) 溶液中的腐蚀电化学行为,提出了涂层体系在浸泡过程中的不同阻抗模型。结果表明,该涂层体系的作用过程可分为3个阶段：浸泡初期为涂层吸水,中期为烷氧基硅烷的水解和缩聚,后期主要为阻挡层保护。阻抗参数解析表明,涂层中硅烷的水解与缩聚增强了涂层的致密度和交联度,从而使涂层体系在浸泡过程中可实现修复和自愈 (或逆损伤)。

关键词 ：有机硅环氧涂层, EIS, 等效电路, 阻抗参数, LY12铝合金

Abstract：Corrosion behavior of LY12 aluminum alloy electrodes coated with silicone-epoxy hybrid coating in 5%NaCl solution was investigated by means of electrochemical impedance spectroscopy (EIS) measurement, while impedance models related to different immersion stages were also proposed. The results indicated that the reaction process of the coating during immersion presented three stages: the initial stage, water was absorbed in the silicone-epoxy hybrid coating; the middle stage, the hydrolysis and poly-condensation of alkoxy-silicone occurred in the coating; and then the coating acted as a protective barrier in the third stage. Analysis of the impedance parameters revealed that the silicone hydrolysis and poly-condensation enhanced the density and the degree of crosslinking of the coating. Therefore, during immersion the coating systems exhibited characteristics of inherent repairing or re-healing.

Key words： silicon-epoxy hybrid coating EIS equivalent circuit model impedance parameter LY12 aluminum alloy

收稿日期: 2013-09-03

ZTFLH:

O464

基金资助:国家自然科学基金项目(51205315和50905142)及西北工业大学研究基金项目(JC20100231和JC201138)资助

通讯作者: 通讯作者：岳珠峰,E-mail：zfyue@nwpu.edu.cn E-mail: zfyue@nwpu.edu.cn

作者简介: 元辛，男，1986年生，博士生，研究方向为涂层防腐和腐蚀电化学

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引用本文:

元辛, 岳珠峰, 温世峰, 李磊. 铝合金表面有机硅环氧涂层的腐蚀电化学行为[J]. 中国腐蚀与防护学报, 2014, 34(4): 375-381.
YUAN Xin, YUE Zhufeng, WEN Shifeng, LI Lei. Electrochemical Corrosion Behavior of Silicone-epoxy Hybrid Coatings on LY12 Aluminum Alloy Electrode. Journal of Chinese Society for Corrosion and protection, 2014, 34(4): 375-381.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2013.136 或 https://www.jcscp.org/CN/Y2014/V34/I4/375

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