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

doi:10.11902/1005.4537.2015.221

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

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

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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

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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

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Cite this article:

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.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.221 OR https://www.jcscp.org/EN/Y2016/V36/I5/463

Fig.1 Surface photo of WBE (a) and distribution along the waterline (b)

Fig.2 Current density distribution maps of WBE surface after immersion for 1 d (a), 2 d (b), 7 d (c), 12 d (d), 19 d (e), 31 d (f), 38 d (g), 47 d (h), 57 d (i) and 85 d (j)

Fig.3 Variations of current density of typical electrodes 5-1# (a), 6-4# (b), 9-3# (c) and 15-3# (d) with time

Fig.4 Surface morphologies of the coating on the electrodes after immersion for 85 d

Fig.5 Current density vs time curves for 5-4# (a), 9-1# (b), 11-3# (c) and 12-4# (d) electrodes after delamination of surface coating

Fig.6 Diagrams of coating delamination in waterline area and metal corrosion: (a) local corrosion cell, (b) macrocorrosion cell, (c) coating damagestate

[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

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