Influence of Paint on Steel Corrosion for Marine Applications

Abdou Abdel-Samad, Yaser Soud, M. Zaki

Department of Production Engineering and Mechanical Design, Faculty of Engineering, Mansoura University, Mansoura, Egypt.
Department of Production Engineering and Printing Technology, Akhbar El-Yom Academy, 6th of October, Egypt.

DOI: 10.4236/jsemat.2014.44022                

Abstract

The majority of naval ships are constructed of mild steel. Corrosion is a major concern in a maritime environment. This particular type of material degradation has recently received more attention by the marine industry. The present work aims to investigate the effect of recent coatings used in marine ship surfaces for preventing corrosion. Experiments were performed according to standard tests to evaluate and measure the coating adhesion to steel and to measure the corrosion wear rate if any for three types of coatings. An accelerated corrosion test was conducted to duplicate in the laboratory the field corrosion performance of a product. The results indicate that all tested types of paint have resulted in a reduction in the corrosion rate compared with the uncoated steel. A minimum corrosion rate of 0.8 mm/year for the coat “Hempadur 52,140” was obtained compared to 2.1 mm/year for the uncoated steel. A microscopic examination of the corroded steel surfaces was conducted which prevailed pitting behavior with different degree. The minimum corroded surface exhibited few pitting attack in comparison to other specimens. Although the pitting attack of the surface layer (paint), one can drive a conclusion that sample surface without coating is aggressively attacked by pits.

Keywords

Corrosion, Marine Paint, Adhesion, Salt Spray Test, DC Electrochemical Polarization Test

Conflicts of Interest

The authors declare no conflicts of interest.

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