Study Of Low-temperature Iron Plating And Compound Electroplating Adding Self-healing Material

One of the major reasons resulting in the failure of mechanical parts should belong to wear. The low-temperature iron plating technology can quickly generate a high hardness of coating layer in the part surface, it will not only restore the mechanical parts back to the provision size, but also significantly improve the wear resistance of the surface parts.This study adopted constant potentiometer as a power in experiments, at the same time, using full direct-current plating technology. Using the roughness and hardness as the evaluation standards to investigate the influence of concentration,temperature and current density to the electroplating layer through the design of orthogonal experiment method. The final optimization results were:FeCl2,350g/L; temperature,40℃; current density,12 A/dm2.In the optimization of a good electrolyte formula and influencing conditions, we got much more superior performance of the composite electroplating layer than iron plating layer and pure iron layer when we added serpentine nano-particles. For example, The micro-hardness of composite electroplating layer reached 600 HV, and the iron plating layer is 450 HV, while the pure iron layer is just only 200 HV. So the conclusion is that the micro-hardness of the composite electroplating has been greatly improved.In order to determine the best amount of serpentine adding into the electrolyte, the surface morphology and property of the electroplating layers were observed and analyzed by optical microscope, micro-hardness tester and so on, and then friction and wear test were done. The basic fundamentals of the electroplating layer formation on superior hardness and wear resistance were discussed. Through the comprehensive analysis, we selected the best amount of serpentine as 2g/L in composite iron plating.