The work aims to explore the deterioration and delamination behavior of organic coatings in different environments (still water, flowing water, and sand erosion) under cathodic polarization conditions. With carbon steel DH36 as the substrate material, alkyd anti-rust primer was applied as the coating material. A rotating stirrer device was employed to mimic diverse environmental conditions. Macro and micro observations of the organic coatings under cathodic polarization were conducted using wire beam electrode technology and morphological characterization analysis methods to document and analyze their deterioration and delamination processes across different environments. The experimental findings revealed that, in still water, flowing water, and sand erosion environments, the coatings underwent varying degrees of deterioration, primarily manifested as water penetration and bubbling, during the initial stages of the experiment. The initial location of coating deterioration was random. The coating delamination primarily spread around the initial point of deterioration, with the impact of still water, flowing water, and sand erosion on coating delamination progressively increasing. Flowing water elevated the coating's water absorption rate and accelerated its deterioration. In sand erosion environments, the abrasive wear from sand particles further decreased the effective protection thickness of the coating, accelerating its delamination damage. Within the same experimental period, the maximum cathodic current densities in still water, flowing water, and sand erosion environments increased sequentially, and the cathodic current density of the electrode was predominantly influenced by the surface condition of the coating. In conclusion, there are significant differences in the deterioration and delamination behavior of organic coatings under different cathodic polarization conditions. Flowing water and sand erosion environments exert a more pronounced destructive influence on coatings, with sand erosion posing the most severe damage.
Key words
organic coating /
cathodic polarization /
deterioration and delamination /
wire beam electrode technique /
fluid flow environment /
erosion environment
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Funding
High-Tech Ships Scientific Research Project of the Ministry of Industry and Information Technology (SSBQ-2020-HN-01-05)
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