소수성 개질된 박리 카올리나이트 첨가 에폭시 코팅의 부식 방지 성능 연구

Abstract

Corrosion still has economic and safety problems. There are many ways to prevent corrosion, the most common of which is barrier protection. Graphene and its derivatives have been the most used for barrier protection, but they are toxic and not cheap. Kaolinite is an inorganic material with a lamellar structure like graphene. However, the laminate structure and hydrophilicity of kaolinite make it difficult to replace graphene. In this paper, to enhance of corrosion protection performance of epoxy coating, exfoliated kaolinite (EK), hydrophobically modified kaolinite (MK) were added to coating. Lithium chloride and dimethyl sulfoxide (DMSO) were used for exfoliation, and siliclad® (octadecyl functional silane) was used hydrophobic modification. EK was characterized by X-ray diffraction (XRD), field emission transmission electron spectroscopy (FE-SEM), dynamic light scattering (DLS). MK was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS). The corrosion protection performance was evaluated in terms of the mixing ratio of the kaolinite, Electrochemical impedance spectroscopy (EIS) was conducted to evaluate the corrosion protection performance of the epoxy coating with different mixing ratios. Corrosion protection performance was successfully improved with the addition of EK and MK, the results were in accordance with those of the barrier and hydrophobic properties.