WBE技术研究水线区破损涂层的剥离机制-II

doi:10.11902/1005.4537.2016.084

中国腐蚀与防护学报

2017, Vol. 37

Issue (4): 322-328 DOI: 10.11902/1005.4537.2016.084

研究报告

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WBE技术研究水线区破损涂层的剥离机制-II

陈亚林^1,²(

), 张伟^1,², 王琦³, 王佳⁴

1 钢铁研究总院青岛海洋腐蚀研究所青岛 266071
2 青岛钢研纳克检测防护技术有限公司青岛 266071
3 山东省海洋生物研究院青岛 266100
4 中国海洋大学化学化工学院青岛 266100

Debonding Mechanism of Organic Coating with Artificial Defect in Areas Nearby Water-line in 3.5%NaCl Solution by WBE Technique-II

Yalin CHEN^1,²(

), Wei ZHANG^1,², Qi WANG³, Jia WANG⁴

1 Qingdao Institute of Marine Corrosion, Qingdao 266071, China
2 NCS Testing Technology Co., Ltd., Qingdao 266071, China
3 Marine Biology Institute of Shandong Province, Qingdao 266100, China
4. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

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摘要:

应用阵列电极 (WBE) 联合电化学阻抗谱 (EIS) 技术,研究了气/液界面水线处破损涂层在3.5% (质量分数) NaCl溶液中的水线区破损涂层剥离行为。对比涂层剥离过程的腐蚀电流密度和阻抗谱分布行为,探讨了破损涂层在水线区的剥离机制。结果表明,涂层破损区和固有缺陷区均能够加速附近涂层阴极剥离过程。水线区破损涂层剥离行为特征为,破损区和固有缺陷区附近涂层首先发生阴极剥离,进而向外部涂层/金属界面扩展。此外,研究发现,破损区位于水线上方和下方时,其推动阴极剥离能力不同,即,加速水线下方涂层剥离作用弱于水线上方区域,致使水线及水线上方涂层剥离速率明显大于水线下涂层剥离速率。其原因显然与阴极剥离区溶解氧含量有关,即富氧区阴极剥离扩展速率大于乏氧区阴极剥离速率。

关键词 ：阵列电极, 水线区, 涂层剥离, 电流分布, 阻抗谱

Abstract：

Organic coatings on metal surface usually present inherent local defects, thus are easy to be deteriorated. The characteristic of corrosion beneath coatings with damages (i.e. the inherent or artificial ones) is that the inherent defect and the debonding defect may be coupled together to induce non-uniform corrosion of the metal substrate. Hence, the debonding process of organic coating with artificial defects nearby the waterline in 3.5% (mass fraction) NaCl solution was studied by means of wire beam electrode (WBE) method coupled with electrochemical impedance spectroscopy (EIS) technique. Through analyzing the variations of current distribution, coating impedance, impedance spectroscopy in the disbonding process, the debonding mechanism for the damaged coating in areas nearby the waterline could be revealed. The result showed that, the cathodic disbonding was expedited in the area around the inherent defect or the artificial defect. The characteristic of disbonding process for damaged coating near waterline is that, the cathodic disbonding first happened nearby the inherent defect as well as the artificial defect, and then expanded around. Besides, the position of the artificial defect can affect the cathodic disbonding process. When the artificial defect just located on the waterline, the disbonding rate above the waterline was higher than that below the waterline. It was because that the higher the oxygen content is, the faster the disbonding rate well be.

Key words： wire beam electrode water-line coating stripping current distribution electrochemical impedance spectroscopy

收稿日期: 2016-06-24

ZTFLH:

O646

基金资助:国家自然科学基金项目 (21203034)

作者简介:

作者简介陈亚林,男,1988年生,硕士

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引用本文:

陈亚林, 张伟, 王琦, 王佳. WBE技术研究水线区破损涂层的剥离机制-II[J]. 中国腐蚀与防护学报, 2017, 37(4): 322-328.
Yalin CHEN, Wei ZHANG, Qi WANG, Jia WANG. Debonding Mechanism of Organic Coating with Artificial Defect in Areas Nearby Water-line in 3.5%NaCl Solution by WBE Technique-II. Journal of Chinese Society for Corrosion and protection, 2017, 37(4): 322-328.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.084 或 https://www.jcscp.org/CN/Y2017/V37/I4/322

图1 阵列电极表面照片

图2 不同浸泡时间的阵列电极表面电流密度分布图

图3 浸泡不同时间后阵列电极的表面形貌

图4 浸泡51 d后11-9#丝的Nyquist图和等效电路

图5 6-3#丝与7-7#丝浸泡不同时间的Bode图

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