Electroless Nickel Plating on T10A Steel

To obtain slight and low porosity eletroless nickel coating on T10A,the effects of temperature,time,nickel sulfate,and sodium hypophosphite on thickness of the coating and porosity rate were studied using single-factor tests.The pleasant range of influencing factors was first obtained.Through orthogonal experimental design,an optimal bath formulation for electroless nickel plating was then determined as follows: nickel sulfate 25g/L,sodium hypophosphite 25g/L,sodium acetate 35g/L,auxiliary complex-former agent 30 g/L,polish 2g/L,sulfocarbamide 2mg/L,pH 4.0and temperature 70℃.The results show that the concentration of significantly influenced the thickness of the coating,porosity rate and hardness;the electrolessnickel-plating with the porosity of 12 points per cm2,thickness of 4.1μm and hardness of 487HV0.1 can be obtained.