Electrochemical characteristics of electroplating and impregnation Ni-P/SiC/PTFE composite coating on 316L stainless ste
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Electrochemical characteristics of electroplating and impregnation Ni-P/SiC/PTFE composite coating on 316L stainless steel GAO Ping-ping(高平平)1, 2, 3, GAO Mei-lian(高美连)1, 2, WU An-ru(吴安如)1, WU Xiao-bo(伍小波)2, LIU Chun-xun(刘春轩)3, ZHANG Yang(张扬)3, ZHOU Hai-kun(周海堃)1, PENG Xiao-min(彭小敏)1, XIE Zhi-yong(谢志勇)2 1. Hunan Provincial Key Laboratory of Vehicle and Transmission System, Hunan Institute of Engineering, Xiangtan 411104, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 3. Hunan Gold Sky Aluminum Industry High-tech Co., Ltd., Changsha 410205, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 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 °. Key words: 316L stainless steel; electroplate; Ni-P; PTFE; SiC; corrosion resistance Cite this article as: GAO Ping-ping, GAO Mei-lian, WU An-ru, WU Xiao-bo, LIU Chun-xun, ZHANG Yang, ZHOU Hai-kun, PENG Xiao-min, XIE Zhi-yong. Electrochemical characteristics of electroplating and impregnation Ni-P/SiC/PTFE composite coating on 316L stainless steel [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4508-6.
1 Introduction Due to the excellent corrosion resistance of 316L stainless steel (316LSS), this ultra-low carbon austenitic stainless steel has been extensively applied in petroleum engineering, chemical engineering, bioengineering, etc [1]. The growing development in the contemporary industries puts forward higher requests on materials (e.g., filter
screen, ship products, fuel cell bipolar plates, extreme low-altitude aircraft) [2, 3]. These applications need materials with better corrosion protection, abrasive resistance and self-lubrication, hence 316LSS has been widely employed, and traditional surface modifications such as physical vapor deposition (PVD) [4], surface cladding, chemical vapor deposition (CVD) [5], chemical coating, electrochemical coating [6] are normally required to further improve the corrosion resistance
Foundation item: Project(2018YFB1502500) supported by the National Key Research and Developm
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