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Open AccessArticle

Characterization of PTFE Film on 316L Stainless Steel Deposited through Spin Coating and Its Anticorrosion Performance in Multi Acidic Mediums

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Department of Mechanical Engineering, International Islamic University, Islamabad 44000, Pakistan
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Department of Aerospace Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah 21589, Saudi Arabia
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Department of Production Engineering, Faculty of Mechanical Engineering and Design, Kaunas University of Technology, 51424 Kaunas, Lithuania
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Department of Mechanical Engineering, University of Engineering & Technology, Peshawar 25000, Pakistan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(2), 388; https://doi.org/10.3390/ma13020388
Received: 30 September 2019 / Revised: 17 November 2019 / Accepted: 23 December 2019 / Published: 14 January 2020
(This article belongs to the Special Issue Materials and Coatings for Extreme Environments)
Polytetrafluoroethylene (PTFE) was coated on 316L stainless steel (SS) substrate through a spin coating technique to enhance its corrosion resistance properties in hydrochloric acid (HCl) and nitric acid (HNO3) medium. Scanning electron microscopy (SEM) revealed the morphology of the coated and uncoated substrates and showed a uniform and crack-free PTFE coating on 316L SS substrate, while a damaged surface with thick corrosive layers was observed after the electrochemical test on the uncoated sample. However, an increased concentration of HCl and HNO3 slightly affected the surface morphology by covering the corrosive pits. An atomic force microscope (AFM) showed that the average surface roughness on 316L SS and PTFE coating was 26.3 nm and 24.1 nm, respectively. Energy dispersive X-ray spectroscopy (EDS) was used for the compositional analysis, which confirmed the presence of PTFE coating. The micro Vickers hardness test was used to estimate the hardness of 316L SS and PTFE-coated substrate, while the scratch test was used to study the adhesion properties of PTFE coating on 316L SS. The anticorrosion measurements of 316L SS and PTFE-coated substrates were made in various HCl and HNO3 solutions by using the electrochemical corrosion test. A comparison of the corrosion performance of PTFE-coated substrate with that of bare 316L SS substrate in HCl medium showed a protection efficiency (PE) of 96.7%, and in the case of HNO3 medium, the PE was 99.02%, by slightly shifting the corrosion potential of the coated sample towards the anodic direction. View Full-Text
Keywords: polytetrafluoroethylene; 316L stainless steel; corrosion performance; coating; microstructure morphology polytetrafluoroethylene; 316L stainless steel; corrosion performance; coating; microstructure morphology
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Akram, W.; Farhan Rafique, A.; Maqsood, N.; Khan, A.; Badshah, S.; Khan, R.U. Characterization of PTFE Film on 316L Stainless Steel Deposited through Spin Coating and Its Anticorrosion Performance in Multi Acidic Mediums. Materials 2020, 13, 388.

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