A Study of Electroless Silver Plating with Pd-Free Activation on Cenosphere

Based on the principle of silver mirror reaction,electroless silver plating was directly carried out on cenoshpere without pretreatments of coarsening and activation.The effects of silver nitrate,glucose,cenosphere loadage,sodium hydroxide and anhydrous alcohol on silver utilization ratio and the weight gain rate,conductivity,binding strength,etc.of the coating were investigated by single factor analysis.The surface morphology and structure of the coating were analyzed by SEM and XRD.The results indicate that as compared with colloidal palladium activation method,the silver utilization ratio is high,and the coating is uniform and compact with superior conductivity and high binding strength when the electroless silver plating process without palladium activation pretreatment is adopted.