Abstract
Organic coatings for marine applications must have great corrosion protection and antifouling performance. This review presents an overview of recent investigations into coating microstructure, corrosion protection performance, antifouling behavior, and evaluation methods, particularly the substrate effect and environmental influence on coating protectiveness, aiming to improve operational practice in the coating industry. The review indicates that the presence of defects in an organic coating is the root cause of the corrosion damage of the coating. The protection performance of a coating system can be enhanced by proper treatment of the substrate and physical modification of the coating. Environmental factors may synergistically accelerate the coating degradation. The long-term protection performance of a coating system is extremely difficult to predict without coating defect information. Non-fouling coating and self-repairing coatings may be promising antifouling approaches. Based on the review, some important research topics are suggested, such as the exploration of rapid evaluation methods, the development of long-term cost-effective antifouling coatings in real marine environments.
Highlights
As an effective barrier to corrosion media, organic coating is one of the most popular corrosion protection approaches [1,2,3,4,5,6,7,8]
Either a hydrophilic or hydrophobic surface is antifouling to only some species [257]
From a corrosion protection point of view, the defects ranging from nano-level broken molecular bonds to micro-level gas bubbles and shrunk pores, up to even millimeter-level cracks are the decisive factor for an organic coating
Summary
As an effective barrier to corrosion media, organic coating is one of the most popular corrosion protection approaches [1,2,3,4,5,6,7,8]. Tremendous research efforts have been made to improve the corrosion resistance and antifouling performance for organic coatings in marine environments, including the design of new polymer molecules or chains [20,21,22], change in coating constituents or additives [23,24,25], modification of coating micro-structures [26,27], decoration of coating surfaces [28,29], and adjustment of coating layers or composite interfaces [30,31,32], as well as the development of new techniques for coating characterization, evaluation and prediction [33,34,35,36] Apart from these well-known achievements in the coating field, there are some fragmentary but important progresses that may fundamentally influence the future research of marine organic coatings. It is expected that new and deepened understandings may be obtained for the behavior of organic coatings in marine environments
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