PTFE THIN FILM COATING ON 316L STAINLESS STEEL FOR CORROSION PROTECTION IN ACIDIC ENVIRONMENT
Nabeel Maqsood1,2*, Afzal Khan1, Muhammad Khalid Alamgir2, Shaukat Ali Shah1, Muhammad Fahad3
Stainless steels (SS) are the most common materials used in various engineering applications because of their
fine mechanical and excellent corrosion resistance properties in different mediums. 316L SS shows poor corrosion
behavior in HCL. Hard coating is often required for protection of 316L SS from wear and corrosion. In this research
paper polytetrafluoroethylene (PTFE) was coated on 316L SS by spin coating technique to modify their corrosion
resistance in acidic media containing Hydrochloric acid (HCL). The anticorrosion property of the 316L SS and PTFE
coating was studied in 40% HCL by electrochemical corrosion test and potentiodynamic polarization curves at room
temperature and compared. The morphology of uncoated and coated substrates were examined by scanning electron
microscopy (SEM) while the compositional analysis performed through energy dispersive x-ray spectroscopy (EDX).
The morphology of the coated and uncoated substrates were also studied before and after electrochemical corrosion
test and then compared. The thickness of the coating was also examined well. The result shows the remarkable
improvement in the corrosion resistance of PTFE coating by decreasing the corrosion current density in HCL media.
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