Fundamental Study on Corrosion Characteristics of Functional Anti-Corrosion Coatings Using a Combined Cycle Tester

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Other Title
  • 複合サイクル試験機を用いた機能性防錆塗装の腐食特性に関する基礎的研究
Published
2025-10-29
Resource Type
departmental bulletin paper
DOI
  • 10.34481/0002001938
Publisher
Faculty of Engineering, University of Miyazaki

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Description

The purpose of this study was to evaluate the corrosion characteristics of various coating systems. To investigate the durability of the coating systems after application in repainting using the equivalent of three types of cleanings, we focused on the rust thickness of black rust formed on the steel surface and the salinity of the black rust adhered to the surface. Test specimens were subjected to accelerated corrosion tests using five different functional anti-corrosion coating systems and the conventional coating Rc-I, and the corrosion characteristics of each coating system were evaluated. As a result, blistering and spot rusting were observed on the test specimens except for the thick-film fluoropolymer paint and Rc-I. It was also found that point rusting and swelling were more likely to occur in the weakly soluble fluorine paint, where the residual rust thickness was greater and the adhered salt concentration was higher. The coating thickness measurement results showed that the weakly soluble fluorine paint, organic-inorganic composite coatings, and thick-film fluoropolymer paint showed a decrease in coating thickness when the residual rust thickness was large and the adhered salinity was high, while the Rc-Ⅰ method showed a decrease in coating thickness only when the residual rust thickness was large and the adhered salinity was moderate. The cross-sectional analysis results showed the presence of black rust Fe3O4 and an increase in residual rust thickness after the accelerated corrosion test.

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