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| Cathodic Polarization Level of Q345 Steel beneath Simulated Disbonded Coating in Agitated Solution |
| WU Zhibin, WEI Yinghua, LI Jing, SUN Chao |
| State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract Potential and current distributions in a cathodically polarized crevice between a simulated disbonded coating and segmented Q345 steels were measured, and the cathodic polarization level in crevice was studied at various level of cathodic protection, and various size of crevice thickness and holiday. The results revealed that agitation decreased the polarization level in crevice, leading to the fact that a higher level of cathodic protection was required to inhibit the metal corrosion in crevice in agitated solution, compared with that in static solution. Crevice thickness and holiday size had significant influence on the phenomenon of agitation weakening the polarization level in crevice.
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[1] Deflorian F, Rossi S. An EIS study of ion diffusion through organic coatings [J]. Electrochim. Acta, 2006, 51: 1736-1744
[2] Toncre A C. On achieving polarization beneath unbonded pipe coatings [J]. Mater. Performance, 1984, 23(8): 22-27
[3] Brousseau R, Qian S. Distribution of steady-state cathodic currents underneath a disbonded coating [J]. Corrosion, 1994, 50(12): 907-911
[4] Chin D T, Sabde G M. Current distribution and electrochemical environment in a cathodically protected crevice [J]. Corrosion, 1999, 55(3): 229-237
[5] Perdomo J J, Song I. Chemical and electrochemical conditions on steel under disbonded coatings: the effect of applied potential, solution conductivity, crevice thickness and holiday size [J]. Corros. Sci., 2000, 42: 1389-1415
[6] Li Z F, Gan F, Mao X . A study on cathodic protection against crevice corrosion in dilute NaCl solutions [J]. Corros. Sci., 2002, 44: 689-701
[7] Chen X, Li X G, Du C W, et al. Effect of cathodic protection on corrosion of pipeline steel under disbonded coating [J]. Corros. Sci., 2009, 51: 2242-2245
[8] Yan M C, Wang J Q, Ke W, et al. Effectiveness of cathodic protection under simulated disbonded coating on pipelines [J]. J. Chin. Soc. Corros. Prot., 2007, 27(5): 257-262
(闫茂成, 王俭秋, 柯伟等. 埋地管线剥离覆盖层下阴极保护的有效性 [J]. 中国腐蚀与防护学报, 2007, 27(5): 257-262)
[9] Chen X, Li X G, Du C W, et al. Crevice corrosion behavior of the steel X70 under cathodic polarization [J]. Acta Metall. Sin., 2008, 44(12): 1431-1438
(陈旭, 李晓刚, 杜翠薇等. 阴极极化条件下X70钢的缝隙腐蚀行为 [J]. 金属学报, 2008, 44(12): 1431-1438)
[10] Jack T R, Van Boven G, Wilmott M, et al. Cathodic protection potential penetration under disbonded pipeline coating [J]. Mater. Performance, 1994, 33: 17-21
[11] Gan F, Sun Z W, Sabde G, et al. Cathodic protection to mitigate external corrosion of underground steel pipe beneath disbonded coating [J]. Corrosion, 1994, 50(10): 804-816
[12] Fessler R R, Markworth A J, Parkins R N. Cathodic protection levels under disbonded coatings [J]. Corrosion, 1983, 39(1): 20-25
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