Graphene oxide modified by zirconium dioxide to enhance the corrosion resistance of Zinc/Aluminum coatings

摘要

In order to improve the corrosion resistance and microhardness of Zinc/Aluminum coatings (Zn/Al coatings), ZrO2, GO and ZrO2 + GO hybrid nanofillers structures were introduced into the Zn/Al coatings respectively. The effect of nanofillers filled in the Zn/Al coatings on the structure, corrosion resistance and micro-hardness was analyzed. The gamma-(2, 3-epoxy propylene oxide) propyltrimethoxysilane (KH-560) was used to modify the surface of nanofillers. The results from FT-IR, XRD and XPS revealed that the KH-560 was successfully grafted onto the surface of nano-fillers. Electrochemical test showed that the nanofillers structure could significantly improve the corrosion resistance of Zn/Al coatings. Compared with ZrO2 nanoparticles, GO was more effective in shielding the corrosive medium. The ZrO2 + GO hybrid nanofillers structure achieves a synergistic effect, showing the best corrosion resistance of all the coatings. In the microhardness test, the introduction of nanofillers structure significantly improved the hardness of Zn/Al coatings, and ZrO2 + GO hybrid coatings showed the highest hardness value.