Analysis of the use of paint coatings to protect the hull from corrosion

Abstract

The most common and reliable method of protecting a ship’s hull from corrosion is paint coatings. Paint coatings can be used to paint products of any size. In case of complete or partial destruction, the paintwork can be easily restored by tinting or completely repainting the surface. Paints and varnishes are easily combined with other methods of corrosion protection. The use of paint coatings is more economical in comparison with other types of corrosion protection. Therefore, it is currently the most common method of protecting ship hulls. In order to determine the quality, the experimental studies of various paints and varnishes were carried out. Experimental prototypes were made. The effect of low temperatures and the effect of an impending water flow on paint and coatings were considered. The main conclusions were drawn from the results of the experiments. For long-term protection from the external environment, it is necessary that the coating film should maintain high adhesion to the surface maintain continuous, have minimal water absorption, devoid of pores and be solid. Samples with a two-layer and three-layer coating of Jotun paint have the best adhesion. Satisfactory results were also obtained on samples with a three-layer coating of XC-436 enamel and with a two-layer coating of stone red.

A Critical Analysis on the Current Design Criteria for Cathodic Protection of Ships and Superyachts

“…In the case of ships, the protection of the metallic hull is obtained by a combination of an organic coating cycle with a cathodic protection system. Many works underlined the essential role of the coating to protect ship hulls from corrosion [ 5 , 6 , 7 , 8 ], and the cathodic protection would be useless if the coating were free of defects, but this is far from being close to reality. Thus, the design and application of a cathodic protection system has to be implemented to guarantee adequate corrosion prevention of the submerged metallic structure.…”