Influence of Paint Type on Steel Corrosion for Marine Applications.

Document Type : Research Studies

Authors

1 Production Engineering and Mechanical Design Department., Faculty of Engineering., El-Mansoura University., Mansoura 35516., Egypt.

2 Akhbar El-Yom Academy., Production Engineering and Printing Technology Department., 6th of October., Egypt.

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 under investigated 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 was obtained for the coat "Hempadur 52140" 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. 

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