Study On The Conductive Behavior And Anti-corrosion Mechanism Of Nano CrN-Pt Coating

Marine atmospheric environment there are high temperature,high humidity and high salt and other factors of the strong coupling effect,the metal sliding friction surface of the electrical connector is very easy to occur passivation corrosion,resulting in reduced efficiency of electrical signal transmission,seriously affecting the stability and reliability of electronic equipment.Surface functional protective coating is one of the effective strategies to solve the corrosion and passivation of electrical connector metal surface,breakthrough high toughness,high conductivity,anti-wear and corrosion resistant integrated protective coating is one of the key technical problems to be solved in the field of surface engineering,the design and preparation of long life electrical connector metal protective coating and performance regulation mechanism research has important academic value and broad engineering application prospects.This project proposes an innovative design concept for nano-precious metal modified nitride coatings,using plasma enhanced magnetron sputtering(PEMS)technology to prepare nano-CrN-Pt composite coatings in a controlled manner,and to analyse the microstructure,nano-mechanics,friction The results of the study show that the CrN-Pt composite coating can be used as the basis for the preparation of the nanocomposite coating.The results show that the CrN-Pt coating has a typical CrN/Pt two-phase nanocomposite structure and that Pt doping drives the nano-microstructural evolution of the CrN coating,leading to a shift from(111)to(200)in the preferred orientation of the CrN coating.Pt doping significantly enhances the solid solution strengthening effect of CrN lattice,but also blocks the co-grid growth of CrN phase.The Pt content significantly affects the frictional wear performance and fatigue fracture failure of the coating,as the Pt content increases,the interfacial mismatch of the coating tissue intensifies,the strength of the dominant interfacial connection decreases,and ultimately leads to a reduction in the wear resistance of the coating Fatigue fracture failure increases.The Pt content significantly affects the electrical conductivity of the coating.The results show that as the Pt content increases,the resistivity of the coating decreases and the electrical conductivity increases.Pt content also significantly affects the corrosion resistance of the coating,with increasing Pt content decreasing the corrosion current density and increasing the corrosion potential.The improved corrosion performance of the coating is due to its microstructural evolution.The discontinuous columnar structure of the CrN coating provides a channel for the diffusion of corrosive media and leads to multi-scale micro-zone passivation corrosion,fracture and spalling.The high chemical inertness of Pt also significantly enhances the chemical stability of the coating tissue,effectively inhibiting the occurrence of local pitting,and the synergistic effect of dense tissue,refined grain size and Pt metal ultimately leads to the corrosion resistance of the coating.This study theoretically reveals the effect of Pt content on the nano-microstructure and properties of CrN-Pt coatings,laying a theoretical foundation for the design,preparation and performance control of highly conductive,wear and corrosion resistant protective coatings for integrated electrical connectors.