The Preparation Of Modified Titanium Hydride Nanoparticle And Epoxy Resin Coating By Ultrasonic-wave Assisted Ball Milling

Coating is one of the most important and economical anticorrosive methods. It is very significant to prepare a coating with high anticorrosion property. In contemporary adding nanoparticles to coating is one of the most important methods to improve the property of coating. In the present study, surface modified titanium hydride nanoparticles are prepared by ultrasonic wave-assisted ball milling. The products are characterized by X-ray diffraction (XRD), particle size test, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and thermo-gravimetry (TG). The property of coating containing modified titanium hydride nanoparticles is investigated. In addition, the influence of nanoparticles content on the property of coating is studied.The process parameters have been optimized. The optimum grinding speed, grinding time and mass ratio of ball to powder is 650r/min, 10h and 20:1, respectively.The results show that the a.verage particle size of modified nanoparticles is about 80nm and modified nanoparticles are homogeneously dispersed. The surface modification of titanium hydride nanoparticles with epoxy resin is carried out by ultrasonic wave-assisted ball milling. The grafting site locates around the epoxy group. The mass ratio of epoxy resin grafted on the nanoparticles surface is about 6.54%. The dispersion stability of nanoparticles in epoxy resin solution is greatly improved by surface modification. The different results of ultrasonic wave irradiation, ball milling (without ultrasonic wave assistance) and ultrasonic wave-assisted ball milling indicate that the coupling effect of ultrasonic wave and mechanical force plays an important role in the grafting process.The dispersion stability and compatibility of nanopartciles with epoxy resin matrix are greatly improved by surface modification. The interface defects and diffusion paths of corrosive medium are reduced, thus improving the density and corrosion resistance of coating.The property of coatings with different nanoparticles content is studied. When nanoparticle content is lower than 5wt%, property of coating becomes better with the increase of the nanoparticle content. But when nanoparticle content is higher than 5wt%, the result is contrary. It is concluded that 5wt%TiH2/epoxy resin coating exhibits the best property.The performance of coating could be greatly improved by adding modified nanoparticles. Firstly, the interface compatibility and bonding strength are improved by surface modification, thus improving the density and corrosion resistance of coating. Secondly, the modified nanoparticles could fill the microporous structure created by coating solidification, which would obstruct the access from the substrate to the outside. Finally, the corrosion process is delayed due to the increased tortuosity of diffusion pathway of corrosive medium in the matrix.