Abstract
In this experiment, the polarization curve, electrochemical impedance spectroscopy ( EIS ) and uniform corrosion of electroless Ni-P- submicron Sn composite coating in corrosion solution were studied. The morphology of the material was observed by SEM scanning electron microscope, and the phase of Ni-P- submicron Sn composite coating at different heat treatment temperatures was analyzed by XRD. Therefore, the influence of Sn particle content and heat treatment temperature on Ni-P- submicron Sn composite coating can be explored. The results show that when the content of Sn is 0.018%, the weight loss rate of Ni-P- submicron Sn composite coating is the smallest and its corrosion resistance is the best. And whether in H2SO4 corrosion solution or NaCl corrosion solution, Ni-P- submicron Sn composite coating has a corrected corrosion potential, a higher charge transfer resistance value (), a smaller electric double layer capacitance value (), and a lower weight loss rate compared with Ni-P coating, indicating that the corrosion resistance of Ni-P- submicron Sn composite coating in acidic corrosion medium is significantly enhanced than that of Ni-P coating. At the same time, Ni-P- submicron Sn composite coating ( Sn content is 0.018%) has the best corrosion resistance when the heat treatment temperature is 200 °C, and the coating has the worst corrosion resistance when the heat treatment temperature is 400 °C.
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