电化学阻抗谱对比研究连续浸泡和干湿循环条件下有机涂层的劣化过程

中国腐蚀与防护学报

2011, Vol. 31

Issue (5): 329-335

研究报告

本期目录 | 过刊浏览

电化学阻抗谱对比研究连续浸泡和干湿循环条件下有机涂层的劣化过程

张伟^1,2,王佳^2,3,赵增元⁴,刘学庆⁵

1. 钢铁研究总院青岛海洋腐蚀研究所青岛 266071
2. 中国海洋大学化学化工学院青岛 266003
3. 金属腐蚀与防护国家重点实验室沈阳 110015
4. 海洋石油工程（青岛）有限公司青岛 266555
5. 青岛国家海洋科学研究中心青岛 266071

EIS STUDY ON THE DETERIORATION PROCESS OF ORGANIC COATINGS UNDER IMMERSION AND CYCLIC WET-DRY CONDITIONS

ZHANG Wei^1,2, WANG Jia^2,3, ZHAO Zengyuan⁴, LIU Xueqing⁵

1. Qingdao Marine Corrosion Institute, Central Research Institute for Steel and Iron, Qingdao 266071
2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003
3. State Key Laboratory for Corrosion and Protection, Shenyang 110015
4. Offshore Oil Engineering Qingdao Co., Ltd, Qingdao 266555
5. National Oceanographic Center, Qingdao 266071

全文: PDF(1496 KB)

摘要: 用电化学阻抗谱（EIS）技术对比研究浸泡在3.5% NaCl溶液中的碳钢表面有机涂层在连续浸泡和干湿循环条件下的劣化过程。结果表明，连续浸泡和干湿循环条件下的涂层劣化过程均可分为三个主要阶段：涂层渗水阶段、基底金属腐蚀发生阶段和基底金属腐蚀发展与涂层失效阶段。和连续浸泡过程相比，干湿循环加速了整个涂层的劣化过程，使涂层进入快速失效阶段。但是干湿循环对涂层失效的三个子过程的加速效果又不完全相同。相对于涂层渗水阶段的加速效果，干湿循环对界面腐蚀发生阶段和腐蚀发展与涂层失效阶段的加速效果更为明显。

关键词 ：有机涂层, 干湿循环, EIS

Abstract：Comparing between immersed and cyclic wet-dry conditions, the deterioration processes of the organic coatings on carbon steel surface have been comparatively studied by using electrochemical impedance spectroscopy (EIS). The wet-dry cycles were carried out in the alternating conditions by immersing in a 3.5% sodium chloride solution and drying at 25° and 50% RH for 4 h respectively. Coating resistance, R_f, coating capacitance, C_f, and double layer capacitance, C_d, were monitored continuously and separately under above two conditions. The percentages of the interface active area, A_w, were estimated from the obtained double layer capacitance, C_d. According to the EIS characteristics, the entire deterioration processes under two above-mentioned conditions can be divided into three main stages, consisting of the medium penetration into coatings, corrosion initiation and corrosion extension underlying coatings. In comparison with the immersed, the wet-dry cycles greatly accelerated the entire deterioration process; especially the corrosion initiation and the corrosion extension periods, leading the paint system lose its anti-corrosive performance in a short period. However, the underlying substrate corrosion of the cyclic coatings was far less serious than the immersed; even the delaminating area was seven times more than the immersed. The acceleration mechanism of the coatings and underlying metal corrosion under wet-dry cycles was discussed based on the above results.

Key words： organic coatings wet-dry cycles electrochemical impedance spectroscopy

收稿日期: 2010-04-13

ZTFLH:

TG174.46

基金资助:

国家自然科学基金项目（50791118）资助

通讯作者: 王佳 E-mail: jwang@mail.ouc.edu.cn

Corresponding author: WANG Jia E-mail: jwang@mail.ouc.edu.cn

作者简介: 张伟，男，1980年生，博士，研究方向为腐蚀电化学

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引用本文:

张伟,王佳,赵增元,刘学庆. 电化学阻抗谱对比研究连续浸泡和干湿循环条件下有机涂层的劣化过程[J]. 中国腐蚀与防护学报, 2011, 31(5): 329-335.
ZHANG Wei, YU Jia, DIAO Ceng-Yuan. EIS STUDY ON THE DETERIORATION PROCESS OF ORGANIC COATINGS UNDER IMMERSION AND CYCLIC WET-DRY CONDITIONS. J Chin Soc Corr Pro, 2011, 31(5): 329-335.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2011/V31/I5/329

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