In order to obtain the optimized factors of ultrasonic Electroless Ni-Co-P Plating by using orthogonal
design experiments,a group of orthogonal tests was arranged and the effect of different additives on electroplating solutions and deposits properties was investigated,concentrations of additives were determined,5 processing parameters
were selected. L16(45) orthogonal test scheme was designed,range analysis was employed to find out the influence sequence on the technology and thus the optimum formula and process were ensured. The test results on optimum condition show that the alloy deposits with 88. 71wt% Ni,3. 72wt% Co,5. 99wt% P are obtained. The obtained Ni-Co-P coating are in fine crystal grain size,well distributed on the substrate surface. The optimized factors are as follows:nickel salt is 40 g/ L,cobaltous sulfate in the solution is 2 g,sodium hypophosphite in the solution is 25 g/L,sodium citrate in the solution is 50 g/L,boric acid in the solution is 20 g/L,the others annexing agent in the solution is 20 to 40 g/L,the pH value is 7. 0,the temperature is 90.