| Increasing economy losses and society impacts that caused by the corrosion of metal materials has attracted more and more attentionfrom all over the world,and thus it is highly desirable to search more superior anticorrosion coatings to mitigate the losses caused by corrosion.Graphene possesses significant advantages andmore and more attention by researchers.Moreover,the development of graphene-modified coatings has positive significance.In this paper,two different methods were used to producemodification of grapheneby p-phenylenediamine and octadecylamine modified graphene oxide.The successful grafting of p-phenylenediamine and octadecylamine on the graphene was confirmed by FTIR XRD,SEM and EDS tests.The modification of graphene has a larger pitch and better dispersibility,indicating that the chemical modifierandgraphene sheet has good synergistic coupling effects.The study on the dispersion properties of modified graphene mainly adopts two methods:physical dispersant and chemical method.The physical dispersant models mainly select SL02,SL03,SDBS,5054,656500 dispersant,respectively.The dispersion effect of graphene in the diluent and resin when using different types of dispersant,the sedimentation curve has drawn and the 656500 type dispersant with superior dispersion performance is selected,and the optimum dosage is obtained by gradient experiment(the mass ratio of graphene to dispersant is 1:1).The chemical method is selected from octadecylamine modified graphene as raw material,and the compounding method of octadecylamine modified graphene and zinc powder is studied.The experimental process proves that the zinc powder and the modified graphene dispersion are premixed to obtain a better compounding effect.Preparation of graphene modified resin first pushed the formula of layers of graphene in coatings.And then on epoxy resin coating acid with graphene modified epoxy coating performance monitoring and high acid accelerated aging experiment are carried out.The acid resistance test was immersed in a 10% sulfuric acid solution,and the results showed that the epoxy resin coated substrate showed obvious rust after 24 h of operation,while the grapheme-modified epoxy resin was no rust phenomenon occurred after 60 h of operation.The acid accelerated aging experiment also proved that the grapheme-modified epoxy resin coating has good protection performance on the substrate,and then optimized the graphene/epoxy resin modified coating,and studied the anticorrosion performance,mechanical properties and electrochemical performance of the coating.The anticorrosion performance of environmentally friendly water-based graphene coatings was tested.The experimental results showed that the water-based graphene anticorrosive coatings with good anticorrosive properties were obtained,and the anticorrosion mechanism was studied by metallographic analysis of graphene aqueous anticorrosive coatings. |
