Optimization of process parameters of electroless Ni-Mo-P ternary alloy coating on red copper substrates and its corrosion resistance
To determine the effects of process parameters on corrosion resistance of electroless Ni-Mo-P ternary alloy coating on red copper substrates,a single factor variable method was implemented by altering the pH value of the plating solution,the concentration of Na2MoO4·2H2O and the plating temperature.Electrochemical test results in a NaCl mass fraction of 3.5%solution were used to determine the optimal chemical plating conditions.Additionally,the microstructure,element composition,and corrosion resistance mechanism of the coating obtained under these conditions were investigated.Results show that an appropriate bath condition and process parameters are as follows:NiSO4·6H2O of 27 g/L,NaH2PO2·H2O of 20 g/L,composite additives of 30 g/L,Na2MoO4·2H2O of 4 g/L,SDBS of 0.008 g/L,pH=9.0,and the plating temperature is 90℃.It is under these conditions that the Ni-Mo-P ternary alloy coatings exhibit excellent corrosion resistance,a smooth and compact surface,and good hydrophobicity.A uniform distribution of elements is observed on the surface of the coating,but an increase in Mo content causes a decrease in P content,thereby weakening its amorphous characteristics.The electroless Ni-Mo-P ternary alloy coating process presented in this study offers a new method for preparing multi-component coatings with good corrosion resistance.
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维普
