Study On Microstructure And Properties Of Graphene Composite Coatings Prepared By Induction Cladding

As an austenitic stainless steel with excellent corrosion resistance and good high temperature mechanical properties,316 L stainless steel is widely used in marine industry,petroleum industry,chemical and papermaking industries,and high temperature bolts and nuts.However,316 L stainless steel cannot meet project needs under the both conditions of friction and wear.Because of this,316 L stainless steel was put forward higher requirements.So the comprehensive performance of the grinding is of great significance and it imposes higher requirements on the properties of 316 L stainless steel such as corrosion resistance and wear resistance.Therefore,the corrosion resistance of 316 L stainless steel is improved.The comprehensive performance of the grinding is of great significance.It has not been possible to obtain the combined properties of corrosion resistance and wear resistance with adoption of traditional methods,while cannot achieve good surface bond strength.In this paper,316 stainless steel powder and graphene were chosen as the matrix powder and enhanced phase respectively,and successfully prepared on the surface of 316 L stainless steel,an anticorrosive and wear-resistant high performance coating has been obtained.Through the design of composition and process,the relationship between cladding technology and mechanical properties was studied,and the best process and treatment method were obtained.The influence of different cladding processes on the microstructure and properties of the coating was studied using metallographic microscope,scanning electron microscope and XRD.At the same time,in order to investigate the wear and corrosion resistance mechanism of graphene,the microstructure,phase and morphology of the coating were analyzed using the MFT-4000 multifunctional surface performance tester and electrochemical workstation.The experimental results show that the hardness of the coating increased with the increase of current,and the hardness of the coating gradually increased with the increase of the content of graphene.When the content of graphene was 0.5%,the coating hardness was 252 HV,and the hardness of the coating was increased by nearly 47% compared with the substrate.We find that the surface morphology of the cladding layer was greatly influenced by different treatment processes.The microstructure of the cross section can be divided into three parts: cladding coating,transition zone and matrix.The matrix is well combined with the coating without porosity,crack and other defects.As the content of graphene increases,the wear resistance of the coating improved,thus can be concluded that the addition of graphene was useful of improving rhe wear resistance.This paper confirms that graphene can improve the corrosion and wear resistance of 316 L stainless steel,which lays a theoretical foundation for better understanding and improvement of induction cladding graphe ne composite strengthening technology,and provides important technical support for the practical application of this technology in the future.