Deterministic modeling of API5L X52 steel in a coal-tar-coating/cathodic-protection system in soil

被引：3

作者：

Li, X. M. ^{[1
]}

Rosas, O. ^{[1
]}

Castaneda, H. ^{[2
]}

机构：

[1] Univ Akron, Dept Chem & Biomol Engn, Akron, OH 44325 USA

[2] Texas A&M Univ, Dept Mat Sci & Engn, College Stn, TX 77843 USA

来源：

INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING | 2016年 / 146卷

关键词：

Pipeline; Coating; Electrochemical impedance spectroscopy (EIS); Transmission line model (TLM); Damage evolution; WATER-UPTAKE; ELECTROCHEMICAL IMPEDANCE; CATHODIC DELAMINATION; ORGANIC COATINGS; CARBON-STEEL; MILD-STEEL; CORROSION; DIFFUSION; FILMS; EPOXY;

D O I：

10.1016/j.ijpvp.2016.09.003

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Impedance characteristic signal for a coal tar-coated API5L-X52 steel with cathodic protection has been investigated in soil using electrochemical impedance spectroscopy (EIS). Deterministic transmission line model (TLM) has been set up to simulate the impedance results of pipeline with intact and artificial defect coating and to verify the damage evolution of coated pipeline with cathodic protection in soil. To illustrate the coating inherent property coating in each transmission line unit has been assumed to be represent by two imaginary parts: a relatively coating barrier part which serves as parallel of capacitor and resistor (C-per R-per) and another part considered as porous coating serves as parallel of porous coating and double layer (C-por R-por (C-dl R-ct)). The parameter theta has been proposed to calculate the total impedance of the coating to illustrate its performance. An adjustment was applied to calculate total resistance R-t mathematically based on the simulation results to illustrate the damage evolution concept. The Rt values are in agreement with the proposed damage evolution stages. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：161 / 170

页数：10

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