Abstract:A3 steel is used as the base material steel in electroless Plating of Ni-Co-P, The best formula and
process conditions are acquired by using the orthogonal experiment methods. The morphology,corrosion resistance, hard鄄
ness,thickness and binding force of coating are tested and analysed. The optimum formula and the technological conditions
are required as follows:35.0 g/ L NiSO4·6H2O, CoSO4·7H2O 4.0 g/ L, NaH2PO2·H2O 30.0 g/ L, Na3C6H5O7·2H2O
60.0 g/ L, H3BO3 35.0 g/ L C3H6O3 12.0 mL/ L, C18H29NaO3S 0.05 g/ L, CN2H4S 2 mg/ L, pH value of 7.0, the tempera鄄
ture of 90益, and the plating time of 2 h. Under this condition, the deposition rate is faster, up to 89.83 g/ (m2·h), the
coating has stronger corrosion resistance, copper sulfate drip experiment time is 285 s; the surface of the coating is smooth
and uniform;the distribution of porosity is smaller;there is better binding force with substrate.
