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International Journal of Corrosion
Volume 2015 (2015), Article ID 903478, 7 pages
http://dx.doi.org/10.1155/2015/903478
Research Article

Effect of High Temperature Sodium Hydroxide Immersion on Fusion Bond Epoxy Coating

Charter Coating Service (2000) Ltd., No. 6, 4604-13 Street NE, Calgary, AB, Canada T2E 6P1

Received 30 June 2015; Accepted 7 September 2015

Academic Editor: Yu Zuo

Copyright © 2015 Amal Al-Borno et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Fusion Bond Epoxy (FBE) coating system was exposed to 5% sodium hydroxide at elevated temperature for 30 days. The result of exposure showed formation of adhere deposit layer, a discolored zone underneath and remaining un-affected bulk of the coating. The deterioration of the coating was characterized using analytical techniques like scanning electron microscopy (SEM), energy-dispersive X-ray (EDAX) spectroscopy, attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), differential scanning calorimetry (DSC), pull-off adhesion, and electrochemical impedance spectroscopy (EIS). Results obtained indicated chemical deterioration of the coating in the discolored zone and leaching of low molecular weight coating component forming deposit layer. Although the adhesion strength and barrier property were not affected, the polymer matrix in the affected zone undergoes severe changes in its surface microstructure, primary chemical structure, and glass transition temperature. This may inflict serious impairment of the coating functional properties and premature failure of the coating in long term exposure.