Study On Electroless Nickel Plating On Wood Surface Used As Electromagnetic Shielding Material

To improve the wood surface decorate property and electromagnetic shielding property and to increase its utilization rate, the new functional wood and wooden composite material with electromagnetic shielding property are studied in this dissertation. The electroless plating is used in this dissertation. The basic theory of wood electroless nickel plating, solution composition and influencing factor are analyzed. And kinetics of nickel deposition was analyzed.The technology of nickel plating on wood veneers is studied. Quantitative researches for electromagnetic shielding effectiveness of electromagnetic shielding wooden material made from nickel-plated veneers is made. Quality of electroless nickel plating film after added rare earth is also studied.Research results are summed up as follows:1. The effect of plating solution composition and technology on wood electroless nickel plating depositing speed are studied. Under the conditions of main salt NiSO₄·6H₂O 45g/L and reducing agent NaH₂PO₂·H₂O 50g/L, Complexant mixture HOOCCHOHCH₂COOH 50g/L and complexing agent HOOCCH₂CH₂CO -OH 50g/L, we can get ideal metal deposition rate when pH is between 6.5～7.5 and plating temperature is 75℃,.2. the reaction kinetics of electroless deposition of Ni-P alloy in alkalescent bath was discussed. Reaction kinetic parameters were obtained and an empirical equation of deposition rate was derived.3. the electromagnetic shielding effectiveness of nickel-plated fir veneer can reach 33.51 decibels 56.43 decibels.4. the effect of Y,Yb,La oxides on deposition rate of bath and stability of solution and appearance quality were studied on the course of electroless plating.The effect of different amount of rare earth additives on nickel electrodepositions was studied in a typical nickel electroplating solution on the surface of fir veneer.