Technology Optimizing Of Electroless Composite Plating Ni-P/Ni-P-PTFE And Coating Performance Research

Process of electroless Ni-P plating technology because of their simple, low cost, and there is excellent plating Ni-P coating, corrosion resistance and solderability performance, and became in recent years is widely used, and continued development of surface protection techniques. Add a self-lubricating PTFE particles in electroless Ni-P coating, Ni-P-PTFE with self-lubricating composite coatings are available, reduce its friction coefficient of Ni-P coating, extend the life of electroless Ni-P coating, use expanding. But due to the joining of PTFE soft particles, Ni-P-PTFE composite coating Ni-P coating corrosion resistance of low hardness, high porosity, poor flaw. Therefore, research Ni-P/Ni-P-PTFE double coating of chemical plating technique and coating performance, performance to compensate for Ni-P-PTFE composite coating defects, to broaden its scope of application is important.First of all, research compound containing boric acid complexing of electroless nickel plating on the effect. By single-factor test, elected the boric acid and lactic acid for compound combinations. By orthogonal experiments determine the best complex amount of lactic acid lOg/L, boric acid15g/L. Under this complex condition by electroless Ni-P plating thickness increased from XRD test shows that the structure of amorphous Ni-P coating; EDS tests indicate that it consists mainly of Ni, P, Ni content90.97%, Ni-P coating by SEM observation of the uniform, tight integrity; combined electrochemical experiments and experiments showed that its corrosion resistance, good bonding strength.Second, by single-factor test, determining cationic surfactant CTAB and non-ionic surfactants OP-10to electroless composite coatings of PTFE particles in Ni-P-PTFE anionic surfactant SDS wetting, dispersing more better, which can be built using. By orthogonal experiments determine the best complex amount of CTAB70mg/L OP-1020mg/L. By XRD test known under the complex conditions get Ni-P-PTFE composite coating of amorphous structures; coating with EDS tests indicate that it consists mainly of Ni, P, F, C, PTFE contents on the order6.41%; and SEM observation of the composite coatings, adhesion experiments also demonstrated its excellent bonding strength.In addition, based on the study of surfactant, through orthogonal experiment, be optimized after the optimum process conditions of electroless composite plating Ni-P-PTFE:PTFE6g/L, temperature of88℃, pH5.2, mixing frequency1min/times. PTFE together with Ni, P alloy deposition, reducing the coefficient of friction and wear of coating enhances the friction-reducing, self-lubricating coating performance. Ni-P-PTFE composite coating hardness, porosity, poor corrosion resistance of Ni-P coating.Finally, after optimizing combination of Ni-P-PTFE, Ni-P electroless plating and electroless composite plating process, by controlling the two effects of plating time can have different thickness than of Ni-P/Ni-P-PTFE double coated, coating performance tests indicate that the double-coated a Ni-P-PTFE composite coating, not only the hardness, porosity reduction, good bonding strength and wear resistance and corrosion resistance are increased accordingly. Show that chemical Ni-P/Ni-P-PTFE plating structures can compensate for PTFE double coating of soft particles resulting from the joining of the Ni-P-PTFE properties of composite coating defects. And determines total plating120min, two times effects plating of plating distribution for underlying chemical plating Ni-P,60min, composite electroless plating of surface when Ni-P-PTFE,60min, double coating performance best.