The Preparation And Modification Of Ti Particles And Its Influence On The Property Of The Epoxy Coating

With the addition of nano Ti particles, the epoxy coating showed the improvedmechanical properties and corrosion resistance. However, since nano Ti particles are a kind ofinorganic filler, they had a poor dispersed stability and interfacial consistency with epoxyresin. This dissertation was using the mechanochemical approach to resolve this problem.The influence of different sand grinding process on the particle size of nano Ti wasinvestigated by the study of different speeds, the proportion of the solid/liquid, the viscosity ofthe grinding agent, etc, and the best formula of all the parameters was then concluded aftercalculations. Using the best formula, the Ti particles were treated with epoxy resin andpolyamide respectively to be refined and surface modified.The particle size test and the contact angle test indicated that, by the grinding agent ofepoxy resin and polyamide respectively, the particle size could be refined to less than100nm,and the hydrophobic property was reduced meanwhile. The IR results showed that there wasno new function group formed on the particle surface. The EIS results showed that thecorrosion resistance of the particles modified by both grinding agents was both improved to1–2orders of magnitude.To optimize the process, further experiments were done. The particle size test showedthat the size were refined from38μm to36.6nm. The IR result showed that new featurefunction group formed on the particle surface. A film was observed on the particle surface byTEM, which was proved by the thermogravimetry and the cladding rate was also calculated.The modified nano Ti coating was prepared by the addition of1%modified nano Ti particles,and by EIS test, it was indicated that low frequency impedance of the coating was still kept at10~9Ω.cm~2after the immersion of1200h, which was3more orders of magnitude than that ofthe epoxy coating; The adhesive force test indicated that, after the addition of the modifiedparticles, the adhesion between the epoxy coating and the metal was also improved; the tensiletest showed that the modified particle coating had the better strength, rigidity and ductilitythan the epoxy coating. This approach well resolved the high brittleness issue of the epoxycoating.The epoxy coating was prepared by the modified nano Ti particles in the proportion of1%,5%and10%, and by the tests of corrosion, adhesion and the tensile, it was indicated that the best corrosion and mechanical properties were obtained when using the1%addition.