Improved Performance of 1-Ethyl-3-Methylimidazolium Tetrafluoroborate at Steel/HCl Interface by Iodide Ions
- 79 Downloads
The corrosion and corrosion inhibition of St37 steel in 0.1 M HCl solution by 1-ethyl-3-methylimidazolium tetrafluoroborate (EMITFB) and the effect of addition of KI on the inhibitive performance of EMITFB have been examined by electrochemical [electrochemical impedance spectroscopy, potentiodynamic polarization, and dynamic electrochemical impedance spectroscopy (DEIS)] and surface examination [scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS)] techniques. Results show that EMITFB could only afford the protection of St37 steel in HCl medium on an average scale. The highest studied concentration of EMITFB (4 mM) affords optimum inhibition efficiency of 78.86% from DEIS method. Addition of iodide ions to EMITFB has beneficial effect on the inhibition efficiency; 86.10% has been achieved by addition of 1 mM KI to 4 mM EMITFB. Adsorption of EMITFB molecules onto the metal surface is via physical adsorption mechanism and follows El Awady et al. kinetic/thermodynamic adsorption isotherm model. SEM and EDS results confirm the improvement of corrosion inhibiting ability of EMITFB by iodide ions. EMITFB and EMITFB + KI behave as mixed-type corrosion inhibitor in the studied environment.
KeywordsSt37 steel Acid solution Corrosion Ionic liquid Corrosion inhibition Iodide ions
Husnu Gerengi thanks the Scientific and Technological Research Council of Turkey for the financial support under the TUBİTAK-114M933 coded project. Moses M. Solomon is grateful to King Fahd University of Petroleum and Minerals, Saudi Arabia for accepting him as a Postdoctoral Research Fellow.
Compliance with Ethical Standards
Conflict of interest
The authors declare that no conflict of interest exist with this manuscript.
- 13.Hassan SA, Hadi AK (2015) Sudan III as corrosion inhibitor for carbon steel St37-2 in H2SO4 solutions. Int J Recent Sci Res 6(7):5445–5453Google Scholar
- 19.Kowsari E, Arman SY, Shahini MH, Zandi H, Ehsani A, Naderi R, PourghasemiHanza A, Mehdipour M (2016) In situ synthesis, electrochemical and quantum chemical analysis of an amino acid-derived ionic liquid inhibitor for corrosion protection of mild steel in 1 M HCl solution. Corros Sci 112(1):73–85CrossRefGoogle Scholar
- 28.Sasikumar Y, Adekunle AS, Olasunkanmi LO, Bahadur I, Baskar R, Kabanda MM, Obot IB, Ebenso EE (2015) Experimental, quantum chemical and Monte Carlo simulation studies on the corrosion inhibition of some alkyl imidazolium ionic liquids containing tetrafluoroborate anion on mild steel in acidic medium. J Mol Liq 211(1):105–118CrossRefGoogle Scholar
- 29.Singh AK, Shukla SK, Quraishi MA (2011) Corrosion behaviour of mild steel in sulphuric acid solution in presence of ceftazidime. Int J Electrochem Sci 6(11):5802–5814Google Scholar
- 40.Umoren SA, Solomon MM (2014) Effect of halide ions on the corrosion inhibition efficiency of different organic species—a review. J Ind Eng Chem 21(1):81–100Google Scholar
- 41.Umoren SA, Banera MJ, Alonso-Garcia T, Gervasi CA, Mirífico MV (2013) Inhibition of mild steel corrosion in HCl solution using chitosan. Cellulose 20(1):29–2545Google Scholar
- 42.Umoren SA, Solomon MM, Eduok UB, Obot IB, Israel AU (2014) Inhibition of mild steel corrosion in H2SO4 solution by coconut coir dust extract obtained from different solvent systems and synergistic effect of iodide ions: ethanol and acetone extracts. J Environ Chem Eng 2(2):1040–1060CrossRefGoogle Scholar
- 45.Zhang S, Sun N, He X, Lu X, Zhang X (2006) Physical properties of ionic liquids:database and evaluation. J Phys Chem 35(4):1475–1517Google Scholar