An electrochemical method for evaluating the resistance to cathodic disbondment of anti-corrosion coatings on buried pipelines

作     者：Chan Li Bei Cao Yinshun Wu 

作者机构：Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Journal of University of Science and Technology Beijing》 (北京科技大学学报（英文版）)

年 卷 期：2007年第14卷第5期

页      面：414-419页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This work is financially supported by the National Natural Science Foundation of China (No.2992021) 

主　　题：buried pipeline anti-corrosion coating resistance to cathodic disbondment (RCD) potentiostatic evaluation method(PEM) fusion bonded epoxy (FBE) three-layer polyethylene (3PE) 

摘      要：Methods for evaluating the resistance to cathodic disbondment （RCD） of anti-corrosion coatings on buried pipelines were reviewed. It is obvious that these traditional cathodic disbondment tests （CDT） have some disadvantages and the evaluated results are only simple figures and always rely on the subjective experience of the operator. A new electrochemical method for evaluating the RCD of coatings, that is, the potentiostatic evaluation method （PEM）, was developed and studied. During potentiostatic anodic polarization testing, the changes of stable polarization current of specimens before and after cathodic disbonding （CD） were measured, and the degree of cathodic disbondment of the coating was quantitatively evaluated, among which the equivalent cathodic disbonded distance AD was suggested as a parameter for evaluating the RCD. A series of testing parameters of the PEM were determined in these experiments.