WBE技术研究水线区涂层劣化和涂层下金属腐蚀-I

doi:10.11902/1005.4537.2015.221

中国腐蚀与防护学报

2016, Vol. 36

Issue (5): 463-470 DOI: 10.11902/1005.4537.2015.221

本期目录 | 过刊浏览

WBE技术研究水线区涂层劣化和涂层下金属腐蚀-I

丁健^1,^2,³,张伟^2,³(

),王佳^1,⁴,陈亚林^2,³,尹鹏飞^2,³,张波^2,³

1. 中国海洋大学化学化工学院青岛 266100
2. 青岛海洋腐蚀研究所青岛 266071
3. 青岛钢研纳克检测防护技术有限公司青岛 266071
4. 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016

Evaluation of Water-line Zone Corrosion of an Electrode with Coating in NaCl Solution by WBE Technique-I

Jian DING^1,^2,³,Wei ZHANG^2,³(

),Jia WANG^1,⁴,Yalin CHEN^2,³,Pengfei YIN^2,³,Bo ZHANG^2,³

1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
2. Qingdao Institute of Marine Corrosion, Qingdao 266071, China
3. NCS Testing Technology Co., Ltd., Qingdao 266071, China
4. Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

全文: PDF(2876 KB) HTML

摘要:

应用阵列电极 (WBE) 技术研究了浸泡在3.5%(质量分数)NaCl溶液中水线区大尺寸电极的涂层劣化和涂层下金属腐蚀发生发展过程。结果表明,浸泡起始时,电极表面阴极区和阳极区分布状态主要受渗水过程影响。随着浸泡时间延长,水线作用明显增强,水线处为阴极,电极底部为阳极,水线处溶解氧浓度高,阴极反应电流大,涂层劣化和涂层下的基体金属腐蚀严重。涂层下基体金属腐蚀溶解反应发生前,必先发生阴极溶解氧还原反应。涂层破损后该电极就成为稳定的阳极区域,阴极区围绕破损处展开,表现为人工缺陷涂层劣化特征。水线区的涂层劣化和涂层下金属腐蚀过程受到渗水过程和水线作用共同影响,与裸金属水线腐蚀行为差异较大。

关键词 ：水线腐蚀, 阵列电极, 涂层劣化, 电流分布

Abstract：

The coating degradation and metal corrosion beneath the coating around the water-line zone of an electrode in 3.5%NaCl solution were studied by means of wire beam electrode (WBE) technique. The results showed that at the beginning of the immersion, the distribution of cathode and anode area was mainly affected by the water penetration process of coatings. As the immersion time extended, the effect of water-line zone expanded, while the water-line zone acts as cathode, and the electrode bottom zone acts as anode. Due to the high concentrations of dissolved oxygen of water-line zone, the cathode reaction was strong leading to serious coating degradation and severe corrosion of base metal beneath the coating. The reduction reaction of the dissolved oxygen on the cathode should occur before the initiation of the dissolution reaction of the metal substrate of the electrode. Once a damage spot occurred on the coating, where soon became a strong and stable anode-like area. Then the cathode area developed around the damaged spot of the coating exhibiting degradation characteristics as that observed on the artificial defects made in coating. Around the water-line zone, the degradation process of the coating and the corrosion process of the metal beneath the coating were affected by the water penetration in combination with the water-line effect, which resulted in a corrosion behavior quite vary from that of the bare metal.

Key words： water-line corrosion wire beam electrode coating delamination current distribution

基金资助:国家自然科学基金项目 (21203034) 资助

	服务

	把本文推荐给朋友
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	丁健
	张伟
	王佳
	陈亚林
	尹鹏飞
	张波
44.8K

引用本文:

丁健,张伟,王佳,陈亚林,尹鹏飞,张波. WBE技术研究水线区涂层劣化和涂层下金属腐蚀-I[J]. 中国腐蚀与防护学报, 2016, 36(5): 463-470.
Jian DING, Wei ZHANG, Jia WANG, Yalin CHEN, Pengfei YIN, Bo ZHANG. Evaluation of Water-line Zone Corrosion of an Electrode with Coating in NaCl Solution by WBE Technique-I. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 463-470.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.221 或 https://www.jcscp.org/CN/Y2016/V36/I5/463

图1 阵列电极表面照片和阵列电极水线附近剖面示意图

图2 浸泡不同时间后WBE表面的电流密度分布图

图3 典型电极的电流密度随时间的变化曲线

图4 浸泡85 d后电极的涂层表面形貌

图5 电极表面涂层破裂处电流密度随时间的变化曲线

图6 水线区涂层劣化和涂层下金属腐蚀反应示意图

[1]	Evans U R.Translated by Hua B D. The Corrosion and Oxidation of Metals [M]. Beijing: Mechanical Industry Press, 1976: 70
[1]	(Evans U R著. 华宝定译. 金属腐蚀与氧化 [M]. 北京: 机械工业出版社, 1976: 70)
[2]	Evans U R.Water-line corrosion of iron and steel with special reference to the addition of the so-called 'inhibitors' of corrosion[J]. J. Soc. Chem. Ind.(London), 1925, 44: 163
[3]	Evans U R.The corrosion and oxidation of metals: Scientific principles and practical applications[J]. J. Chem. Educ., 1960, 37(12): 662
[4]	Evans U R.Report on corrosion research work at Cambridge University interrupted by the outbreak of war[J]. J. Iron Steel Inst., 1940, 141, 219
[5]	Tomashov N D.The Theory of Corrosion and Protection of Metals[M]. New York, MacMillan, 1966
[6]	Jeffrey R, Melchers R E.Corrosion of vertical mild steel strips in seawater[J]. Corros. Sci., 2009, 51(10): 2291
[7]	Tan Y J.Wire beam electrode: A new tool for studying localised corrosion and other heterogeneous electrochemical processes[J]. Corros. Sci., 1999, 41(2): 229
[8]	Zhang W.Study on the deterioration processes of organic coatings under the wet-dry cyclic conditions [D]. Qingdao: Ocean University of China, 2010
[8]	(张伟. 干湿交替环境中有机涂层失效过程的研究 [D]. 青岛: 中国海洋大学, 2010)
[9]	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., 1999, 41: 547
[10]	Tan Y J, Bailey S, Kinsella B.Mapping non-uniform corrosion using the wire beam electrode method. III. Water-line corrosion[J]. Corros. Sci., 2001, 43(10): 1931
[11]	Chen Y L.Evaluation of metal corrosion and coating delamination in water-line area by WBE technique [D]. Qingdao: Ocean University of China, 2014
[11]	(陈亚林. 阵列电极技术研究水线区金属腐蚀及涂层剥离过程[D]. 青岛: 中国海洋大学, 2014)
[12]	Chen Y L, Zhang W, Wang J.Evaluation of water-line area corrosion for Q235 steel by WBE technique[J]. J. Chin. Soc. Corros. Prot., 2014, 34: 451
[12]	(陈亚林, 张伟, 王佳等. 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: 451)
[13]	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(11): 2941
[13]	(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, 26(11): 2941)
[14]	Wang W, Wang J, Zhang X.The influence of local glucose oxidase activity on the potential/current distribution on stainless steel: A study by the wire beam electrode method[J]. Electrochim. Acta, 2009, 54(23): 5598
[15]	Zhang X, Wang J, Wang W.A novel device for the wire beam electrode method and its application in the ennoblement study[J]. Corros. Sci., 2009, 51(6): 1475
[16]	Kong D Y, Wang Y, Zhang W, et al.Correlation between electrochemical impedance and current distribution of carbon steelunder organic coating[J]. Mater. Corros., 2012, 63: 475
[17]	Zou Y.Research on electrochemical corrosion behavior of the rusted carbon steel in seawater [D]. Qingdao: Ocean University of China, 2010
[17]	(邹妍. 海水中锈层覆盖碳钢的腐蚀电化学行为研究 [D]. 青岛: 中国海洋大学, 2010)
[18]	Furbeth W, Stratmann M.The delamination of polymeric coatings from electrogavanised steel-a mechanistic approach. Part1: delamination from a defect with intact zinc layer[J]. Corros. Sci., 2001, 43: 207
[19]	Naderi R, Attar M M, Moayed M H.EIS examination of mill scale on mild steel with polyester-epoxy powder coating[J]. Prog. Organ. Coat., 2004, 50: 162
[20]	Nazarov A P, Thierry D.Scanning Kelvin probe study of metal/polymer interfaces[J]. Electrochim. Acta, 2004, 49: 2955
[21]	Leng A, Streckel H, Stratmann M.The delamination of polymeric coatings from steel. Part 2: First stage of delamination, effect of type and concentration of cations on delamination, chemical analysis of the interface[J]. Corros. Sci., 1999, 41: 579
[22]	Leng A, Streckel H, Stratmann M.The delamination of polymeric coatings from steel. Part 3: Effect of the oxygen partial pressure on the delamination reaction and current distribution at the metal/polymer interface[J]. Corros. Sci., 1999, 41: 599
[23]	Deflorian F, Rossi S.An EIS study of ion diffusion through organic coatings[J]. Electrochim. Acta, 2006, 51: 1736

[1]	邓培昌, 刘泉兵, 李子运, 王贵, 胡杰珍, 王勰. X70管线钢在热带海水-海泥跃变区的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2018, 38(5): 415-423.
[2]	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.
[3]	冯林,王燕华,钟莲,王佳,李爱娇,金晓晓. 短期贮存对金属铜腐蚀电化学行为的影响[J]. 中国腐蚀与防护学报, 2016, 36(4): 375-380.
[4]	陈亚林,张伟,丁葵英,王佳,尹鹏飞,董彩常,杨万国. 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(1): 67-72.
[5]	陈亚林, 张伟, 王伟, 王佳, 王琦, 蔡光旭. 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): 451-458.
[6]	裴和中,尹作升,张国亮,刘远勇. 2024与2124铝合金电偶腐蚀行为的对比研究[J]. 中国腐蚀与防护学报, 2012, 32(2): 133-136.
[7]	李正奉; 毛旭辉; 甘复兴 . 阴极保护下缝隙内的电流分布[J]. 中国腐蚀与防护学报, 2000, 20(6): 338-343 .
[8]	林昌健;卓向东;陈纪东;王辉. 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): 7-11.

Viewed

Full text

Abstract

Cited

Shared

Discussed