Research on the Ni-Cu-P Electroless Plating on Q235 Steel
Effect of Ni-Cu-P electroless plating process on Q235 steel upon guality,structure and property of this deposited film are systematically studied by orthogonal experiment design.The result shows that: The significance influence on the film net mass of the factors decreases according to the order: [Ni~(2+)]/[H_2PO_2~-]ratiopHcopper sulfateplating temperatureNa_3C_6H_5O_7·2H_2O(Complex compound);The better Ni-Cu-P electroless plating processing in this experimental conditions is proposed as follows: plating temperature of 75 ℃,[Ni~(2+)]/[H_2PO_2~-] ratio of 0.25(NiSO_4·6H_2O of 30 g/L,NaH_2PO_2·H_2O of 45 g/L),ph of 10.0,Na_3C_6H_5O_7·2H_2O of 50 g/L and copper sulfate of 1.0g/L;Under the optimal operating conditions of the scheme,the microhardness of the plating film was 2.8 times as hard as that of Q235 steel and the experiment gets non-crystal plating film of exceeding 11% P.