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Coatings 2018, 8(5), 185; https://doi.org/10.3390/coatings8050185

Corrosion Resistance of Pipeline Steel with Damaged Enamel Coating and Cathodic Protection

1
Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409-0030, USA
2
Roesch Inc., Belleville, IL 62226, USA
*
Author to whom correspondence should be addressed.
Received: 20 February 2018 / Revised: 12 April 2018 / Accepted: 9 May 2018 / Published: 14 May 2018
(This article belongs to the Special Issue Coatings for Harsh Environments)
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Abstract

This paper presents the first report on the corrosion resistance of pipeline steel with damaged enamel coating and cathodic protection in 3.5 wt % NaCl solution. In particular, dual cells are set up to separate the solution in contact with the damaged and intact enamel coating areas, to produce a local corrosion resistance measurement for the first time. Enamel-coated steel samples, with two levels of cathodic protection, are tested to investigate their impedance by electrochemical impedance spectroscopy (EIS) and their cathodic current demand by a potentiostatic test. Due to its glass transition temperature, the enamel-coated pipeline can be operated on at temperatures up to 400 °C. The electrochemical tests show that cathodic protection (CP) can decelerate the degradation process of intact coating and delay the electrochemical reactions at the enamel-steel interface. However, CP has little effect on the performance of coating once damaged and can prevent the exposed steel from corrosion around the damaged site, as verified by visual inspections. Scanning electron microscopy (SEM) indicated no delamination at the damaged enamel–steel interface due to their chemical bond. View Full-Text
Keywords: pipe steel; enamel; cathodic protection; electrochemical impedance spectroscopy (EIS); scanning electron microscopy (SEM) pipe steel; enamel; cathodic protection; electrochemical impedance spectroscopy (EIS); scanning electron microscopy (SEM)
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Fan, L.; Reis, S.T.; Chen, G.; Koenigstein, M.L. Corrosion Resistance of Pipeline Steel with Damaged Enamel Coating and Cathodic Protection. Coatings 2018, 8, 185.

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