EFFECT OF PHOSPHITE IONS ON THE KINETICS OF NICKEL DEPOSITION BY HYPOPHOSPHITE

The phosphite ion effect on the rate and mechanism of the Ni-P alloy e lectroless plating is studied systematically. Phosphite ions may both promote and inhibit formation of the Ni-P films, depending on the rati o between the concentrations of the reaction reagents and products. Th e phosphite ion concentration in the solution affects the deposit comp osition or the surface state of layers under deposition, affecting the catalytic properties of the Ni-P deposits. The change in the catalyti c activity has an effect on the limiting stage, leading to a change in the process rate.