Corrosion Resistance of Transmission Pipeline Steel Coated with Five Types of Enamels


Corrosion is one of the main causes of incidents occurred in hazardous liquid and gas transmission pipelines in the USA, resulting in a loss of over $12 billion per year. In this study, the corrosion resistance of pipeline steel coated with five types of enamel was investigated in 3.5 wt% NaCl solution with linear polarization resistance and electrochemical impedance spectroscopy tests. Steel coupons were cut from API 5L X65 pipeline steel and coated with five types of enamels using the wet process. The microstructures of all enamel samples were examined by scanning electron microscopy. Experimental results indicate that all enamel coatings increase the corrosion resistance of pipeline steel, and pure enamel PE2, mixed enamels ME1 and ME2 have higher corrosion resistances than pure enamel PE1 and mixed enamel ME3.


Materials Science and Engineering

Second Department

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Electrochemical Impedance Spectroscopy (EIS); Enamel Coating; Scanning Electron Microscopy (SEM); Steel Pipe; Corrosion Resistance; Electrochemical Corrosion; Electron Microscopy; Natural Gas Transportation; Pipelines; Shotcreting; Spectroscopy; 3.5 Wt% NaCl Solution; Gas Transmission Pipeline; Hazardous Liquids; Linear Polarization Resistance

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2017 Chinese Society for Metals, All rights reserved.

Publication Date

01 Apr 2017