Abstract:The influences of the process parameters and the concentration of the compound complexant consisting of ethylenediamine, ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and acrylic acid on the quality of electroless palladium (Pd) were studied using L9(34) orthogonal table. The brightness of Pd coating, the bath stability and the plating speed were taken as assessment standard. The results show that the optimized bath of the electroless Pd is possessed of good stability and high depositing rate. The binding force between Pd film and Ni coating is strong, and Pd film surface is bright. The optimized concentration of ethylenediamine is 0.2 mol/L, EDTA-2Na was 0.01 mol/L, acrylic acid was 0.3 mol/L and pH was 8