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论文类型：期刊论文

发表时间：2020-02-15

发表刊物：WEAR

收录刊物：EI、SCIE

卷号：442

ISSN号：0043-1648

关键字：Erosion-corrosion; Pre-corrosion; Pipeline steel; Sand impingements

摘要：The initiation and the dynamic progression of erosion-corrosion on a pre-corroded X65 pipeline steel surface was investigated using coupon electrodes and wire beam electrode (WBE). Results show that a concentrated erosion-corrosion region would appear on the steel surface after pre-corrosion which is significantly different from the scatter distributed impingement craters on a fine polished steel coupon. The initiation of localized erosion-corrosion on a pre-corroded steel surface is most probably induced by the instant interfacial chemical and electrochemical heterogeneity, and the instantaneous inhomogeneous sand impingements rather than the surface roughness increasing and the porous rust layer. The pre-corroded area having an initial intense sand impingements would propagate to a concentrated low-lying erosion-corrosion area and small cathodic regions would propagate to isolated islands in the low-lying area.