物理化学学报 >> 2004, Vol. 20 >> Issue (11): 1297-1302.doi: 10.3866/PKU.WHXB20041103

研究论文 上一篇    下一篇

阻抗谱定量分析金属/有机涂层界面粘接力

孙秋霞; 张鉴清; 林昌健   

  1. 浙江大学化学系,杭州　310027;　金属腐蚀与防护国家重点实验室,中国科学院金属研究所,沈阳　110016; 厦门大学,固体表面物理化学国家重点实验室,厦门　361005
  • 收稿日期:2004-03-08 修回日期:2004-06-01 发布日期:2004-11-15
  • 通讯作者: 张鉴清 E-mail:zjq@public1.zju.edu.cn

Quantitatively Predicate State of Adhesion between Coating/Metal Interface by EIS Measurements

Sun Qiu-Xia; Zhang Jian-Qing; Lin Chang-Jian   

  1. Department of Chemistry, Zhejiang University, Hangzhou　310027; State Key Laboratory for Corrosion and Protection of Metal, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang　110016; State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen　361005
  • Received:2004-03-08 Revised:2004-06-01 Published:2004-11-15
  • Contact: Zhang Jian-Qing E-mail:zjq@public1.zju.edu.cn

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摘要： 采用传输线类型的CR电路解析阻抗谱得到离散的电容参数,它们随离散特征频率变化的线性区间斜率与有机涂层/金属界面的瞬时脱层速率有关,不受缺陷位置腐蚀产物的影响,重现性好.建立了阻抗谱与粘结力的定量关系和数据处理方法,并进行了验证,说明了精度较高的原因.用硅烷直接预处理,或者磷化、热浸锌后再处理,会明显影响A3钢与环氧粉末涂层之间的粘结力.

关键词: 阻抗谱, 　传输线, 　界面粘接力, 　有机涂层, 　A3钢

Abstract: According to the experimental results and the basic concept that the capacitive contribution of the coating/metal system to EIS can reflect the change occurring at interface sensitively, the quantitative relationship between the adhesion and the analytical result of EIS is established. The approach is using the transmission line model (CR circuit) to obtain the discrete capacitance values, analyzing the physical meaning of the slope at the region in which the discrete capacitances change linearly with the discrete characteristic frequency. The data handling method is also given in detail. The relationship is validated by experiments. The results show that under certain conditions, the slopes are mainly determined by the speed of instantaneous delamination at organic coating/metal interface and are not influenced by the corrosion product built up at the artificial defect, so they have good reproducibility despite the EIS of duplicate samples showing very different configuration. The analytical results from EIS are often higher than that of mechanical measurements when adhesion is strong. Explanation of the discrepancy shows that the results from EIS are more accurate and reasonable. In regard to epoxy powder paints and A3 steel, the results also indicate that the pretreatment of substrate using silane with and without hot-dip galvanized or phosphate treatment can influence markedly the adhesion between substrate and coating.

Key words: Electrochemical impedance spectroscopy(EIS), 　Transmission line,　Interfacial adhesion, 　Organic coating, 　A3 steel