A Study of Fast Electroless Ni-P Alloy Plating for Low Carbon Steel

Acid electroless Ni-P alloy plating was carried on carbon steel substrate and the effects of such processing parameters as temperature,pH value,mass concentration of reducing agent,processing time,etc.on deposition rate and corrosion resistance of the electroless coating was investigated by single factor experiments.The results show that the most optimal conditions are: NiSO4·6H2O 30 g/L,NaH2PO2·H2O 40 g/L,C6H5Na3O7·2H2O 10 g/L,acetic acid 10 mL/L,lactic acid 10 mL/L,pH value 4.0,temperature 90 ℃,processing time 1.5h.Under such processing conditions,plating rate has reached 78 g·m-2·h-1 and plating thickness 23 μm.The coating has a strong corrosion resistance and the porosity distribution is narrower.