A mathematical model of crevice corrosion for buried pipeline with disbonded coatings under cathodic protection

CATEGORY: PIPELINES: CREVICE CORROSION
A mathematical model of crevice corrosion for buried pipeline with disbonded coatings under cathodic protection

Type	Journal Article
Author	Wenhe Wang
Author	Kuiling Shen
URL	http://www.sciencedirect.com/science/article/pii/S0950423016300791
Publication	Journal of Loss Prevention in the Process Industries
Date	March 2016
Abstract	Crevice corrosion occurs in a holiday and disbonded region between coating and pipeline steel. While cathodic protection (CP) is an effective method for corrosion prevention of pipeline, its effectiveness is be reduced at defects in a disbonded coating. It is difficult to measure and probe corrosion parameters accurately based on experimental work. Consequently, a mathematical model is necessary to identify the phenomena and mechanisms that contribute to the crevice corrosion process. Authors present a mathematical model developed to determine the evolution of chemical and electrochemical transient processes of crevice corrosion in NaCl dilute solution, and the effect of cathodic protection and crevice width on corrosion of 20# steel pipeline with disbonded coatings. Their method could be used to help mitigate the corrosion failure of pipelines to prevent catastrophic accidents in oil, gas and chemical process industries.