To Investigate Corrosion Prevention Performance Of AISI 316L Stainless Steel In H2SO4 Acidic Medium Using Polytetrafluoroethylene Coating

Teflon (Polytetrafluoroethylene, PTFE), 316L Stainless Steel, Corrosion Resistance, Sulfuric Acid (H2SO4), Electrochemical Testing, SEM Morphology, EDX Composition

ABSTRACT

AISI 316L Stainless steel (SS) belongs to a sub class of Austenitic Chromium Nickel SS. It has wide range of applications due to its excellent property profile. It exhibits and sustains good mechanical strength even at higher temperature and depicts better corrosion resistance. The corrosion performance of AISI 316L SS degrades when it exposes to acidic environment and gets corroded. The present study attempts to investigate the corrosion prevention performance of Polytetrafluoroethylene (PTFE) coated AISI 316L Stainless Steel exposed to H2SO4 acidic medium. The corrosion performance and corrosion rates are investigated in different concentration of H2SO4 using electrochemical corrosion test and Potentiodynamic polarization graphs. Different concentrations of H2SO4 were considered in this study. Using Scanning Electron Microscope, the morphological details of pre- and post-PTFE coated samples of AISI 316L SS were examined and discussed before and after electrochemical corrosion tests. It is found that in comparison with uncoated AISI 316L SS samples, PTFE coated samples provide a relatively good resistance to corrosion rate in H2SO4 acidic medium.

REFERENCES

[1] Hryniewicz T, Rokicki R and Rokosz KJC. Corrosion characteristics of medical-grade AISI type 316L stainless steel surface after electropolishing in a magnetic field. 2008; 64: 660-665.
[2] Curley-Fiorino M and Schmid GJCS. The effect of the Cl− ion on the passive film on anodically polarized 304 stainless steel. 1980; 20: 313-329.
[3] Fontana MG. Corrosion engineering. Tata McGraw-Hill Education, 2005.
[4] Henry P, Takadoum J and Berçot PJCS. Tribocorrosion of 316L stainless steel and TA6V4 alloy in H2SO4 media. 2009; 51: 1308-1314.
[5] Mischler S, Ponthiaux P and du CEFRACOR CTJW. A round robin on combined electrochemical and friction tests on alumina/stainless steel contacts in sulphuric acid. 2001; 248: 211-225.
[6] Noubactep C, Meinrath G, Dietrich P, et al. Testing the suitability of zerovalent iron materials for reactive walls. 2005; 2: 71-76.
[7] Maqsood NJJOE and SCIENCES A. PTFE thin film coating on 316l stainless steel for corrosion protection in acidic environment. 2017; 36.
[8] Chenglong L, Dazhi Y, Guoqiang L, et al. Corrosion resistance and hemocompatibility of multilayered Ti/TiN-coated surgical AISI 316L stainless steel. 2005; 59: 3813-3819.
[9] Shabani-Nooshabadi M, Ghoreishi SM, Jafari Y, et al. Electrodeposition of polyaniline-montmorrilonite nanocomposite coatings on 316L stainless steel for corrosion prevention. 2014; 21: 416.
[10] Marin E, Lanzutti A, Lekka M, et al. Chemical and mechanical characterization of TiO2/Al2O3 atomic layer depositions on AISI 316 L stainless steel. 2012; 211: 84-88.
[11] Aravindan N and Sangaranarayanan MJPiOC. Influence of solvent composition on the anti-corrosion performance of copper–polypyrrole (Cu–PPy) coated 304 stainless steel. 2016; 95: 38-45.
[12] Obadele BA, Andrews A, Olubambi PA, et al. Effect of ZrO2 addition on the dry sliding wear behavior of laser clad Ti6Al4V alloy. 2015; 328: 295-300.
[13] Obadele BA, Olubambi PA, Andrews A, et al. Electrochemical behaviour of laser-clad Ti6Al4V with CP Ti in 0.1 M oxalic acid solution. 2015; 646: 753-759.
[14] Fayomi O and Abdulwahab MJIJoES. Degradation behaviour of aluminium in 2M HCl/HNO3 in the presence of arachis hypogeae natural oil. 2012; 7: 5817-5827.
[15] Rehim SSA, Hazzazi OA, Amin MA, et al. On the corrosion inhibition of low carbon steel in concentrated sulphuric acid solutions. Part I: Chemical and electrochemical (AC and DC) studies. 2008; 50: 2258-2271.
[16] Akram, Rafique A, Maqsood N, et al. Characterization of PTFE Film on 316L Stainless Steel Deposited through Spin Coating and Its Anticorrosion Performance in Multi Acidic Mediums. Materials 2020; 13: 388. DOI: 10.3390/ma13020388.