Preparation Of IL-GO Nanoparticles And Their Application In Corrosion-Resistant Coating

Biomedical magnesium alloys are prone to react with ions in the human body fluid environment to generate porous,uneven,and poorly adherent hydroxide and oxide coatings,which require effective surface modification methods to improve their corrosion resistance.Micro-arc oxidation is an economic and environmentally friendly new surface modification technology,but the single micro-arc oxidation coating has defects such as holes and cracks,which cannot achieve long-term protection.In order to solve the above problems,this paper prepared a hydroxyapatite/micro-arc oxidation composite coating and added graphene oxide nanoparticles modified with ionic liquid corrosion inhibitor to the composite coating,which not only played a good barrier effect to make the coating more complete,but also had corrosion inhibition effect to further improve the corrosion resistance of the coating.The main research works are as follows:1.1-Aminopropyl-3-methylimidazole bromide salt ionic liquid and graphene oxide particles were used as raw materials to prepare IL-GO nanoparticles with corrosion inhibition effect,and the composition and morphology of the nanoparticles were characterized by Raman,FT-IR,XPS,SEM,and EDS,which proved the successful grafting of both,and the corrosion inhibitor in the nanoparticles was calculated by TG test The loading of corrosion inhibitor in the nanoparticles was calculated by TG test as 2.4 wt.%.The corrosion inhibition effect of IL-GO nanoparticles was proved by electrochemical test,and the ions will be released to adsorb on the surface of magnesium alloy at the initial stage,and the best corrosion resistance of the coating was achieved when the immersion time was 48 h,but with the extension of time,the adsorption layer was destroyed leading to the decrease of corrosion resistance.2.IL-GO nanoparticles were added to hydroxyapatite sol-gel,and the composite coating was prepared on the micro-arc oxide coating,and the morphology and composition of the coating were characterized by XPS,SEM,EDS,and roughness,etc.It was found that the hydroxyapatite coating with the addition of IL-GO nanoparticles was complete and continuous,and the pores on the micro-arc oxide surface were completely closed,and it was found that by electrochemical and hydrogen precipitation tests The corrosion resistance of the composite coating was significantly higher than that of the other layers due to the good corrosion inhibition and chemical stability of graphene oxide imparted by the ionic liquid,which further improved the corrosion resistance of the composite coating.