铝合金防护涂层老化动力学研究

中国腐蚀与防护学报

2012, Vol. 32

Issue (3): 256-261

研究报告

本期目录 | 过刊浏览

铝合金防护涂层老化动力学研究

蔡健平¹,刘明¹,安英辉²

1. 北京航空材料研究院金属腐蚀与防护研究室北京 100095
2. 北京科技大学材料科学与工程系北京 100083

DEGRADATION KINETICS OF PROTECTIVE COATING FOR ALUMINUM ALLOY

CAI Jianping¹, LIU Ming¹, AN Yinghui²

1. Department of Metal Corrosion and Protection, Beijing Institute of Aeronautical Materials, Beijing 100095
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083

全文: PDF(1424 KB)

摘要: 在紫外/盐雾加速综合环境条件下，研究了铝合金试样上聚酰胺清漆老化过程。采用环境扫描电子显微镜观察了防护涂层表面形貌的变化，采用电化学阻抗(EIS)分析了涂层的老化过程，同时还测量了光泽度、颜色、表面电阻和体积电阻在涂层老化过程中的变化。结果表明：在涂层老化过程中，涂层孔隙率增加，而体积电阻、表面电阻则降低， EIS给出了在涂层老化的不同阶段的特征。采用光泽度、颜色、表面电阻和体积电阻以及电化学阻抗数据作为性能参数，建立了涂层老化动力学方程，并给出了涂层失效判据，并对涂层老化动力学的参数进行了讨论，认为采用体积电阻或低频阻抗模值作为性能参数描述涂层老化动力学过程更为合理。

关键词 ：综合环境试验, 有机防护涂层, 老化动力学, 电化学阻抗(EIS)

Abstract：The degradation process of polyamide epoxy varnish for aluminum alloy was studied in ultraviolet/ salt spray combined environmental test, the morphology of the coating was observed by environmental scanning electron microscopy(ESEM), other physical parameters such as volume resistance, surface resistance were also measured in the exposure test. Meanwhile, EIS(electrochemical impedance spectroscopy) was utilized to monitor degradation process of the coating. The results showed that the porosity of the coating increased and the volume resistance and surface resistance decreased in the degradation process. EIS illustrated different stages of the degradation process. First order type degradation kinetics or simplified KWW model are suggested and discussed based on the quantitative measurements; coating failure criterion determined from EIS was also suggested. It is considered that the electrical resistance and electrochemical impedance modulus at low frequency is suitable to construct degradation kinetics.

Key words： combined environmental test organic protective coating degradation kinetics electrochemical impedance spectroscopy (EIS)

收稿日期: 2011-04-11

ZTFLH:

TG146.2

基金资助:

国家自然科学基金项目(51071144)资助

通讯作者: 蔡健平 E-mail: jpcai2001@yahoo.com.cn

Corresponding author: CAI Jianping E-mail: jpcai2001@yahoo.com.cn

作者简介: 蔡健平，男，1969年生，高级工程师，研究方向为金属腐蚀防护及环境工程

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引用本文:

蔡健平,刘明,安英辉. 铝合金防护涂层老化动力学研究[J]. 中国腐蚀与防护学报, 2012, 32(3): 256-261.
SA Jian-Bengjpcai2001, LIU Meng. DEGRADATION KINETICS OF PROTECTIVE COATING FOR ALUMINUM ALLOY. J Chin Soc Corr Pro, 2012, 32(3): 256-261.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I3/256

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