Electrochemical characteristics of electroplating and impregnation Ni-P/SiC/PTFE composite coating on 316L stainless steel

Abstract

Ni-P/SiC/PTFE coating was obtained on the surface of 316L stainless steel by electrodeposition of Ni-P/SiC coating and immersion of PTFE (polytetrafluoroethylene). The surface morphology and composition were analyzed by scanning electron microscope and energy dispersive spectrometer. The corrosion resistance of the coating in 0.5 mol/L H₂SO₄+2×10⁻⁶ HF solution was studied by electrochemical method. Surface contact angle was used to test the hydrophobic properties of the coating. The results indicated that the Ni-P/SiC/PTFE coating prepared on the surface of stainless steel was uniform and compact, which significantly improved the self-corrosion potential of stainless steel. The self-corrosion current density decreased from 7.62 to 0.008 µA/cm². The durability performance of coating was tested under 0.6 V voltage and the stable corrosion current density value was 0.19 µA/cm², then wetting angle was tested after durability experiment and the value is 134.5 °.

Keywords

316L stainless steel / electroplate / Ni-P / PTFE / SiC / corrosion resistance

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