Study Of External Magnetic Field On The Process And Performance Of Ni-P-diamond Electroless Composite Plating

Composite material as a large development trend of the material preparation and synthesis,which has became a common consensus on the science and technology workers. As one of theimportant technology of composite materials preparation, electroless composite platingtechnology due to its flexibility to join various particles, performance of various compositeparticles in order to obtain different performance of composite coating is widely used in theproduction practice. At present, the domestic chemical composite plating research mainlyfocused on wear resistant composite coating, self-lubricating composite coating, hightemperature oxidation resistance of composite coating, protective decorative coating and so onseveral imporatant areas. Diamond particles has very excellent wear resistance and high hardness,the doping in electroless plating solution, together with the Ni-P alloy deposit on the surface ofworkpiece, the preparation of the excellent performance of Ni-P-diamond wear resistantcomposite plating.This subject is that a series of experiments of preparation technology about diamond wearresistant composite coating was explored, through introducing steady magnetic field andalternating magnetic field to change the direction of magnetic field and continuously controlmagnetic field intensity, carried out experiments for these conditions above, at the same time, toanalyze mechanism and characterize performance for these obtained Ni–P-diamond compositecoatings, and to establish the nickel ions, phosphate ions and diamond particles by magnetized inplating solution, which can form a coating by chemical energy and sedimentary conditions ofthermodynamics and kinetics, finally implemented the optimization of process, the coatings’performance improvement. In addition, the magnetic field is introduced into chemical compositeplating technology, the technology is feasible, simple operation, low cost, easy to promote.The results show that:(1) Using superimposed ways of magnetic field and rotating power field can magnetize artificial diamond such as containing impurities and magnetization offerromagnetic material.(2) The magnetic field by changing the reaction system of entropy and s.refers to the former coefficient of Arrhenius formula for A chemical reaction rate or positive ornegative impact.(3) External magnetic field can change the state of particles’ deposition,metallographic structures and surface morphology of the composite coating, deposition rate,hardness, friction coefficient, wear value performance, particularlly, it is beneficial for thesurface morphology of the composite coating.(4) Integrated all the research results, optimumprocess parameters for screening: diamond particles adding amount of4g/L, compoundsurfactant, magnetization5minutes, plating time4h, water bath temperature of85±1℃, pH4.7, for a constant magnetic field, using up and down, left and right plus a pair of magneticallypowerful magnet for alternating magnetic field, using the12V voltage.