표면 개질된 할로이사이트 나노튜브가 첨가된 에폭시 코팅의 부식 방지 특성 연구

Abstract

HalloySite Nanotubes (HNTs) are natural mineral clay nanotubes that can be applied to a variety of applications. However, HNTs have problems that it has a non-uniform size, a characteristic of forming surface charge and interfacial hydrogen bonds, and thus aggregation easily occurs. Therefore, surface modification is essential to using HNTs. In order to generate hydrophobic functional group on HNTs surface, surface modification of the HNTs was successfully carried out by piranha etching, TMCS and HMDS treatment. FTIR, FE-TEM, and XPS analyses were conducted to characterize the modified HNTs. Carbon steel coated with epoxy film containing HNTs and m-HNTs was prepared and immersed in 3.5wt% NaCl solution to perform EIS analysis. As a results, the increase of pristine HNTs additions led to the increase of moisture absorption behavior due to the presence of more Al-OH hydrophilic groups in epoxy coatings, eventually led to accelerated delamination of the coating. On the other hand, the increase of m-HNTs additions led to the presence of more hydrophobic groups in epoxy coatings and the resulting decreased moisture absorption behavior, which eventually led to the improvement of corrosion protection performance successfully.