Study on surface Ni-W-P coating and properties of copper alloy for soft decoration design
In response to the complex service environment requirements of copper alloys used in soft decoration design,in order to solve the problems of low surface hardness and poor corrosion resistance of copper alloys,a Ni-W-P coating was prepared on the surface of copper alloy for soft decoration de-sign using chemical plating method.The effects of Na2WO4 concentration on the deposition rate,sur-face morphology,phase composition,hardness,and corrosion resistance of the chemical coating were studied.The results show that as the concentration of Na2WO4 increases from 15 g/L to 65 g/L,the de-position rate of the copper alloy surface coating first increases and then decreases,the maximum value is achieved at a Na2WO4 concentration of 35 g/L.The P element content in the coating gradually decreas-es,while the W element content first increases and then decreases.Ni and Ni5P4 diffraction peaks can be observed in coatings with different concentrations of Na2WO4.The hardness of the coating is higher than that of the coating without Na2WO4 added.As the concentration of Na2WO4 increases,the hardness of the coating first increases and then decreases,reaching its maximum value at a Na2WO4 concentration of 35 g/L.As the concentration of Na2WO4 increases from 15g/L to 65 g/L,the corrosion potential of the copper alloy surface coating first moves forward and then moves negative,and the corrosion current density first decreases and then increases.When the concentration of Na2WO4 is 35 g/L,the minimum corrosion current density and the maximum charge transfer resistance are obtained.The electrochemical impedance spectrum and polarization curve test results are consistent,indicating that Na2WO4 has the best corrosion resistance when the concentration is 35 g/L.
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