Chemical Modification Of Filler And Resin Interface And Its Failure Behavior On Organic Coatings

In the process of national development and construction,the exploitation of the ocean has always been placed in an important position.The reason is that it contains very rich marine resources which are of great significance to economic establishment and development.The abyssal environments confronted with severe metal corrosion and protection issues.Therefore,it is crucial to choose proper protective methods to mitigate the process of metal corrosion.The addition of the pigment filler in the organic coating can significantly slow down the corrosive reaction when the corrosive media in the ocean infiltrates into the metal matrix,so it plays an important role in the anti-corrosion of the metal.Given the fact that graphene has eminent mechanical and thermal properties,it is widely applied in various fields.As a pigment filler to epoxy coatings,it can theoretically slow down the process of corrosion.However,due to the high surface energy of graphene itself,graphene sheets are not easily dispersed and are prone to agglomeration,so that it cannot prevent the entry of corrosive media.Therefore,it is urgent to improve the dispersibility of graphene and investigate the failure mechanism of graphene epoxy coating under corrosive environment.The main content of this paper is as follows:(1)Oxidation and graft modification of pigmented graphene were conducted,and the modification process was optimized through experiments.Then,the success of grafting the silane coupling agent to graphene oxide was confirmed by sedimentation experiment,FTIR test,SEM,and TEM test,Besides,the dispersibility of the modified graphene oxide in the organic solvent was improved,and the stacking and agglomeration between the microscopic sheets of the graphene oxide were improved at the same time.(2)Comparing the performance of the unmodified graphene oxide organic coating with the modified graphene oxide organic coating,including the water absorption test,adhesion test,and toughness test of the organic coating,it was discovered that compared with the unmodified graphene oxide organic coating,at the end of the corrosion reaction,the adhesion of the olefinic organic coating of the modified graphite oxide increased by 75.25%;the tensile strength increased by 86.87%;the elongation rate increased by 37.2%;the water absorption rate decreased by 19.32%.These evidences proved that the overall performance of graphene oxide organic coating in the service environment was significantly better than unmodified graphene oxide organic coating.(3)Stimulating the entire corrosion process through the electrochemical impedance spectroscopy test of the graphene oxide organic coating and the modified graphene oxide organic coating,it was found that the graft modification of the graphene oxide filler does not change the failure mode and the process of the organic coating,but can efficiently slow down the infiltration of corrosion media,thereby delaying the process of corrosion reaction.