|
|
Debonding Mechanism of Organic Coating with Artificial Defect in Areas Nearby Water-line in 3.5%NaCl Solution by WBE Technique-II |
Yalin CHEN1,2(), Wei ZHANG1,2, 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 |
|
|
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.
|
Received: 24 June 2016
|
|
Fund: Supported by National Natural Science Foundation of China (21203034) |
About author: These authors contributed equally to this work. |
[1] | Leng A, Streckel H, Stratmann M.The delamination of polymeric coatings from steel. Part 1: Calibration of the Kelvinprobe and basic delamination mechanism[J]. Corros. Sci., 1998, 41: 547 | [2] | Evans U R.Translated by Hua B D. The Corrosion and Oxidation [M]. Beijing: Machnical Industry Press, 1976: 70(Evans U R著. 华宝定译. 金属的腐蚀与氧化 [M]. 北京: 机械工业出版社, 1976: 70) | [3] | Wang J.The Role of Liquid File Pattern in Atmospheric Corrosion[M]. Beijing: Chemical Industry Press, 2016: 271(王佳. 液膜形态在大气腐蚀中的作用 [M]. 北京: 化学工业出版社, 2016: 271) | [4] | Tan Y, Bailey S, Kinsella B.Mapping non-uniform corrosion using the wire beam electrode method. III. Water-line corrosion[J]. Corros. Sci., 2001, 43: 1931 | [5] | Wang D.Study on effect of inhibitors on localized corrosion of metal using the wire-beam electrode [D]. Changsha: Hunan University, 2005(王丹. 用丝束电极研究缓蚀剂对金属局部腐蚀的影响 [D]. 长沙: 湖南大学, 2005) | [6] | Lin C J, Zhuo X D, Chen J D, et al.Corrosion potential imaging at interface of polymeric coating/metal by array electrodetechnique[J]. J. Chin. Soc. Corros. Prot., 1997, 17(1): 7(林昌健, 卓向东, 陈纪东等. 阵列电极法测量聚合物/金属界面电位分布[J]. 中国腐蚀与防护学报, 1997, 17(1): 7) | [7] | Wang W, Zhang X, Wang J.The influence of local glucose oxidase activity on the potential/current distribution on stainless steel: A study by the wire beam electrode method[J]. Electrochem. Acta, 2009, 54: 5598 | [8] | Zhang X, Wang J, Wang W.A novel device for the wire beam electrode method and its application in the ennoblement study[J]. Corrosion. Sci., 2009, 51: 1475 | [9] | Zhang W, Wang J, Li Y N, et al.Evaluation of metal corrosion under defective coatings by WBE and EIS technique[J]. Acta Phys.- Chim. Sin., 2010, 26: 2941(张伟, 王佳, 李玉楠等. WBE联合EIS技术研究缺陷涂层下金属腐蚀[J]. 物理化学学报, 2010: 2941) | [10] | Chen Y L, Zhang W, Ding K Y, et al.Debonding mechanism of organic coating with man-made defect in the area nearby water-line by WBE technique[J]. J. Chin. Soc. Corros. Prot., 2016, 36: 67(陈亚林, 张伟, 丁葵英等. WBE技术研究水线区破损涂层的剥离机制[J]. 中国腐蚀与防护学报, 2016, 36: 67) | [11] | Zhang X, Wang W, Wang J.Characterization of Electrochemical Heterogenity of Interface of an Artificial Biofilm/Metal by Means of a Wire Beam Electrode[J]. Corros. Sci. Prot. Technol., 2009, 21: 242(张霞, 王伟, 王佳. 利用丝束电极技术研究模拟微生物膜/金属界面的电化学不均匀性[J]. 腐蚀科学与防护技术, 2009, 21: 242) | [12] | Chen Y L, Zhang W, Wang W, et al.Evaluation of water-line area corrosion for Q235 steel by WBE technique[J]. J. Chin. Soc. Corros. Prot., 2014, 34(5): 452(陈亚林, 张伟, 王伟等. WBE技术研究水线区Q235碳钢腐蚀[J]. 中国腐蚀与防护学报, 2014, 34(5): 452) | [13] | Kong D Y.Study on the degradation of organic coatings and substrate metal corrosion by combined WBE and EIS techniques [D]. Qingdao: Ocean University of China, 2011(孔德艳. 联合丝束电极技术和电化学阻抗技术研究有机涂层劣化过程 [D]. 青岛: 中国海洋大学, 2011) | [14] | Kong D Y, Wang W, Wang J.Correlation between electrochemical impedance and current distribution of carbon steel under organic coating[J]. Mater. Corros., 2012, 63: 475 | [15] | Yu C Y.Cause of Corrosion Failure in Coated Steels and Protection[J]. Total Corros. Control, 2014, 28(1): 32(余存烨. 涂层钢腐蚀破坏的原因与防护[J]. 全面腐蚀控制, 2014, 28(1): 32) | [16] | Li Y N.The research of the cathodic protection effect on broken organic coating [D]. Qingdao: Ocean University of China, 2011(李玉楠. 阴极保护对破损有机涂层防护作用的研究 [D]. 青岛: 中国海洋大学, 2011) | [17] | Cao C N.Principles of Electrochemistry of Corrosion [M]. 3rd ed. Beijing: Chemical Industry Press, 2008: 229(曹楚南. 腐蚀电化学原理 [M]. 第3版. 北京: 化学工业出版社, 2008: 229) | [18] | Wang F L, Kang W L, Jing H M. Corrosion Electrochemical Principle, Method and Application [M]. Beijing: Chemical Industry Press, 2008: 132(王凤平, 康万利, 敬和民. 腐蚀电化学原理、方法及应用 [M]. 北京: 化学工业出版社, 2008: 132) | [19] | Zhang B H, Cong W B, Yang P.Metal Electrochemical Corrosion and Protection [M]. Beijing: Chemical Industry Press, 2005: 115(张宝宏, 丛文博, 杨萍. 金属电化学腐蚀与防护 [M]. 北京: 化学工业出版社, 2005: 115 |
|
No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
|
Shared |
|
|
|
|
|
Discussed |
|
|
|
|