갈판 코팅된 탄소강의 부식 저항성에 미치는 Cr 3+ 화성처리 및 폴리머 코팅의 영향

In this study, corrosion properties of galfan-coated carbon steel were compared and analyzed after applying trivalent chromium chemical conversion treatment and polymer coating techniques. Potentiodynamic polarization and galvanostatic corrosion experiments were performed to compare corrosion resistance of galfan-coated carbon steel with different coatings. Results of the potentiodynamic polarization test demonstrated that the specimen treated with both trivalent chromium chemical conversion and polymer coating exhibited superior corrosion resistance to other specimens, showing the lowest corrosion current density of 0.058 μA/cm². In contrast, the specimen coated only with galfan presented the highest corrosion current density of 0.118 μA/cm², indicating the lowest corrosion resistance. These results were further validated through additional analyses, including galvanostatic corrosion experiment, 3D microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. Results of this investigation confirmed that trivalent chromium chemical conversion treatment along with polymer coatings could effectively enhance corrosion resistance of carbon steel, offering a promising and environmentally friendly anti-corrosion technology.