optimization of preliminary treatment on the surface of boron nitride particles for ni-p electroless coating

applying a ni-p electroless coat on the surface of bn(h) particles has a beneficial effect on their wettability in vortex technique during composite manufacturing. in this investigation, different preliminary treatments consisting of different combinations of surface oxidation, sensitization and activation have been investigated. the results obtained from scanning electron microscope (sem) and energy dispersive spectroscopy (eds) showed that the preliminary treatment has an important role in deposition of ni-p on the surface of bn(h) powder. a preliminary treatment consisting of oxidation in 200 ºc for 1 hour, sensitization in 10g/l sncl2+30ml/l hcl solution for 15 minutes and then, activation in 0.25 g/l pdcl2 +30ml/l hcl solution resulted in the best results.