| As the earth's non renewable resources,metals play an indispensable role in the electronic industry,building materials and equipment,engineering machinery,military equipment,aerospace and other fields.However,due to the influence of external environmental factors,there are different degrees of wear and corrosion on the metal surface,which affects the production and life to a certain extent.Metal protection has been a research hotspot in recent years,and external coating protection method is the most widely used and common metal protection method.Adding protective layer on metal surface can endow it with wear resistance,corrosion resistance and other characteristics,as the most common coating substrate,epoxy resin has good wear resistance,insulation,corrosion resistance and strong hardness,but it has low toughness,bending resistance and tensile strength after curing.Adding fillers with specific functions into the epoxy resin matrix can change its internal structure,so as to realize the reinforcement and toughening of the epoxy resin matrix.In order to study a composite material with excellent anti-corrosion and wear resistance based on epoxy resin,the optimal content of nano-alumina modified by ?-ampere-methyloxysilane in epoxy base is first determined,and then At this content,it is loaded on the surface of KH560 modified graphene oxide,and the two are added as fillers to epoxy resin to prepare a new type of nanocomposite spherical nano-alumina/graphene oxide/epoxy resin.In the experiment,micromorphological,chemical structure and performance tests were carried out on two-phase and three-phase nanocomposive materials,and the effects of different fillers on the properties of epoxy resin matrix were analyzed.Single component filler coating: the FTIR test showed that ?-aminopropyltrimethoxysilane had been successfully grafted on the surface of alumina.It can be seen from the micro morphology that alumina is uniformly dispersed in the epoxy resin matrix.Compared with pure epoxy resin,the hardness,bending strength,impact strength and elongation at break of the modified nano alumina / epoxy resin composite coating are improved.When the content of alumina is 3.0%,the comprehensive performance is the best,increased by 51%,35%,278% and 51% respectively.The wear resistance is improved and the wear loss is reduced by 50%,but the adhesion of the coating becomes smaller due to the reduction of a large number of polar functional groups.Two component filler coating: the FTIR test results show that alumina and graphene oxide have been successfully compounded,and the cross distribution of two-component fillers can be seen from SEM.Different percentage of modified graphene oxide was added into the modified nano alumina(3.0%)/ epoxy resin system,and its performance test was the same as that of the single component filler coating.When the content of graphene oxide is0.6%,the hardness,bending strength,impact strength,elongation at break and adhesion of the coating are 56%,44%,496%,95% and 19% higher than those of pure epoxy resin,and the wear loss was reduced 53%,all the above properties are better than those of nano alumina /epoxy resin coating with one component filler.Through the electrochemical impedance test,it can be found that the coating has a long initial and intermediate corrosion period,and the special microstructure of the two-component filler makes it excellent in corrosion resistance.Thanks to the unique sandwich structure of nano alumina / graphene oxide,nano alumina and graphene oxide co-modify the epoxy resin matrix,the three-phase composite can bear greater stress and load,so it has better wear resistance,impact and corrosion resistance. |
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