Study On The Performance Of Micro-pit-like Bionic Nanocoating Prepared Via Jet Electrodeposition On The Surface Of The Electric Submersible Pump

Electric submersible centrifugal pumps are currently widely used rodless oil extraction equipment in various oil fields.The working principle of it is using electric motors to drive multi-stage centrifugal pumps to rotate to generate centrifugal force to lift crude oil to the ground.Multi-stage centrifugal pumps are mainly composed of joints,shells,rotating shafts,sleeves,impellers,and guide wheels,etc.Because centrifugal pumps work in media containing corrosive substances,and the impeller guide wheels rotate in the shell for a long time and wear between the shells.It is easy to appear corrosion,abrasion,and other failure forms.Therefore,the research that how to improve the surface performance of the impeller guide wheel of the electric submersible pump has become one of the urgent problems to be solved in the oil well lifting equipment.Depositing metal-based nanocoating is one of the effective ways to improve the overall performance of the metal surface.The metal-based nanocoating not only has the advantages of matrix metal and nano-particles,but also can produce properties that the original component does not have.Nowadays,the deposition methods of metal-based nanocoating have diversified characteristics.However,the jet electrodeposition technology is improved on the basis of the electrodeposition technology with the characteristics of high efficiency and stability,in which the fluidity of the plating solution is used to reduce the concentration polarization and increase the limiting current density.In addition,the on and off of the pulse power supply can transform the plating growth process and improve the quality of the plating.Therefore,the use of spray electrodeposition technology to prepare metal coatings has become a hot spot in current research.At the same time,SiC nanoparticles have a fine-grain strengthening effect in the process of coating formation,and owing to their own high hardness.SiC nanoparticles have become the reinforcing phase nano-scale particles that are often introduced into metal-based nano-plating to improve the overall performance of the coating.The preparation of the bionic structure on the metal surface can make it have various special properties.A large number of studies have proved that the micro-pit bionic structure can have a good effect of reducing friction and resistance.Therefore,this paper combines the bionic structure with jet electrodeposition technology.After preparing the micro-pit-like bionic structure on the metal surface by laser engraving technology,the Ni-SiC nanocoating was electrodeposited on the surface of the metal.In order to prepare the micro-pit-like Ni-SiC bionic nanocoating with excellent wear resistance performance,and apply this coating to the repair work of the impeller of the submersible pump,it is necessary to explore the effect of micro-pit bionic structure parameters,and the main parameters of jet electrodeposition on the wear resistance of the nanocoating.This paper takes the micro-pit-like biomimetic nanocoating as the object to study.First,ANSYS Workbench was used to study its bionic structure parameters.By analyzing the equivalent stress distribution after friction between the simulated surfaces,the best micro-pits structural parameters for drag reduction and wear resistance were determined,and the result was verified via friction experiment?Then the orthogonal test method was used to optimize the process parameters of the micro-pit-like biomimetic nanocoating prepared by jet electrodeposition,and the effects of current density,plating solution spray speed,nozzle outlet diameter,and pole spacing on the microhardness and wear in the coating were studied separately,and soon the best preparation process parameters were determined.Additionly,the micro-pit-shaped Ni-SiC biomimetic nanocoating prepared by different process parameters combination was observed and tested via SEM,TEM,XRD,friction and wear tester,and other characterization test methods.The best combination of process parameters for the jet electrodeposition micro-pit-shaped Ni-SiC biomimetic nanocoating is current density of 35 A/dm~2,plating solution spraying speed of 0.6 m/s,nozzle outlet diameter of 25 mm,and pole spacing of 15 mm.Taking the micro-pit-shaped Ni-SiC biomimetic nanocoating prepared under different process parameter combinations as the research object,the characterization and test analysis showed that:the micro-pit-shaped Ni-SiC biomimetic nanocoating prepared under the best process parameters The coating surface was flat,the SiC nanoparticles were evenly dispersed,the Ni grain size was the smallest,and the microstructure was relatively compact.As a result,it had high hardness,low friction coefficient and excellent wear resistance.The jet electrodeposition method was used to prepare micro-pit-like Ni-SiC biomimetic nanocoating on the surface of the submersible pump impeller guide wheel.There were no obvious corrosion voids and wear scratches on the surface,the hardness value was greatly improved,and the wear amount was significantly reduced.