Experimental and Theoretical Studies on the Corrosion Inhibition Performance of Molecules Containing Tert-Butyl Benzyl Group on Mild Steel in Acid Media

  • Turuvekere Krishnamurthy Chaitra
  • Kikkeri Narasimhashetty Mohana
  • Harmesh Chander Tandon
Article
  • 19 Downloads

Abstract

The inhibition by (4-tert-butyl-phenyl)-acetic acid hydrazide (TPAH), 5-(4-tert-butyl-benzyl)-[1,3,4] oxadiazole-2-thiol (TBOT) and 5-(4-tert-butyl-benzyl)-4H-[1,2,4] triazole-3-thiol (TBTT) of mild steel corrosion in 0.5 M HCl was investigated using gravimetric and electrochemical techniques. These inhibitors acted more effectively at higher concentration and at lower temperature; among these TBTT being the most efficient inhibitor, which showed highest efficiency of 92.6% at 303 K and 4.8 mM concentration. Adsorption of TPAH followed Freundlich isotherm, whereas TBOT and TBTT followed Langmuir isotherm. Energy of activation for corrosion increased after the addition of inhibitors. Free energy of adsorption showed that all the three inhibitors get adsorbed to the mild steel surface by both physical and chemical processes. EIS studies confirmed that all the inhibitors offered higher charge transfer resistance to the corrosion current and this led to decreased double-layer capacitance. Polarization studies showed that all inhibitors emerged as mixed type. Surface studies confirmed that the pits caused by corrosion were decreased by protective film of inhibitors. Corelation of experimental data with quantum chemical parameters like ELUMO, energy gap, dipole moment, hardness and softness confirmed the superior performance of TBTT as compared to TPAH and TBOT.

Keywords

Mild steel Corrosion Adsorption Electrochemical Quantum chemical 

Notes

Compliance with Ethical Standards

Conflict of interest

All authors declare that they have no conflict of interest.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Turuvekere Krishnamurthy Chaitra
    • 1
    • 3
  • Kikkeri Narasimhashetty Mohana
    • 1
  • Harmesh Chander Tandon
    • 2
  1. 1.Department of Studies in Chemistry, ManasagangotriUniversity of MysoreMysuruIndia
  2. 2.Department of ChemistrySri Venkateswara CollegeNew DelhiIndia
  3. 3.Department of Studies in ChemistryPooja Bhagavat Memorial Mahajana PG CentreMysuruIndia

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