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Electrochemical characteristics of pipeline-steel
with planar-defect epoxy-coating in simulated solutions of Ku'erle
soil |
| DU Cui-wei1, LI Xiao-gang2, WANG Wei2, SONG Yi-quan2 |
| 1.Corrosion and Protection Center, School of Materials Science and Engineering, University of Science and Technology Beijing；Beijing Key Laboratory for Corrosion, Erosion and Surface Science; 2.Corrosion and Protection Center, School of Materials Science and Engineering, University of Science and Technology Beijing; |
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Abstract An X70 pipeline steel and a low-carbon steel with different types of coating defects were studied using corrosion tests in Ku’erle simulated soil solution containing 0.6000 mol/L Cl-. Electrochemical characteristics of the X70 pipeline steel with planar-defect epoxy-coating in simulated solutions of Ku’erle soil were tested. The results show that in 0.6000 mol/L Cl- simulated solution, for low-carbon steel with coating defects (the area ratio is 4.91%), at free corrosion potential and with immersion time, the corrosion with disbond was more severe than that with a break or with break and disbond. In Ku’erle soil simulated solution, when the coating defect area ratio was increased gradually (0.39% → 1.57% → 6.28%), the corrosion of the X70 steel under coating with break was promoted gradually, and the influence of immersion time on the corrosion decreased. The influence of the immersion time on the corrosion was weakened when the defect area ratio increased to a certain degree.
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Issue Date: 05 December 2008
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