Study On The Technology And Properties Of Electrodeposition Composite Coating Of Pipeline Nickel-Graphene

With the continuous deepening of oil and gas resources exploration and development,the regional distribution of oil and gas resources is further aggravated,and pipeline transportation of oil and gas resources is a major measure to solve this problem.However,the long-distance transmission of ultra-long pipelines,once there is a local pipeline leakage or failure will lead to the paralysis of the entire transmission line.Moreover,it is sometimes necessary to replace the entire long-distance transmission pipeline,resulting in risks such as suspension of oil and gas transportation,suspension of production,and increase in production costs.Therefore,it is of great significance to improve the protective ability of pipeline equipment for the transportation of oil and gas resources.Nano-graphene materials have shown good performance in improving the performance and protection of parts,and have been a hot topic in scientific research for recent years.Due to the complexity of nanometer graphene electrodeposition technology,the application on the pipeline is rarely reported.Therefore,the preparation technology for electrodeposition of nickel-based graphene composite coating on the inner surface of the pipeline is studied.At the present stage,the test equipment can not analyze the performance of the pipeline surface coating.The authors first base on the electrodeposition of nickel-based graphene composite coating on parallel plates in order to serve as the basis of the graphene electrodeposition technology of the pipeline and the best technological conditions.Firstly,the theory of electrodeposition process is analyzed,the simulation model of nanometer material electrodeposition is established by using the multi-physical field simulation environment of COMSOL Multiphysics,and the distribution of mass concentration,strength and thickness of electrodeposition in this process is obtained.The range of pulse current density and the distance between polar plates are determined by using the boundary effect and evenness of the coating to provide the theoretical basis for the experimental study.Secondly,combined with the plate electrode graphene electrodeposition experiment,the influence of cathode current density,concentration of graphene oxide,Pulse vacancy ratio,Pulse frequency and other technological parameters on corrosion resistance of electrodeposition nickel-based graphene composite coating was studied by a single factor test.Orthogonal test was carried out on the basis of single factor test to determine the technical conditions of electrodeposition process of nickel based graphene for pipeline.An experimental equipment platform for electrical deposition of pipes was established to conduct experimentalresearch on the electrodeposition of nickel-based graphene in pipelines.Finally,the microscopic microstructure morphology,microhardness,thickness of coating and corrosion resistance of the coating of the plain nickel plating,the parallel nickel graphene composite plating,the pipe nickel plating,and the nickel graphene composite plating of the pipeline were examined,compared and studied.The best parameters for the electrodeposition of nickel graphene for pipelines are: cathode current density 4A/dm2,graphene oxide concentration 0.07 g/L,Pulse vacancy ratio 30 %,Pulse frequency 1000 Hz.