Corrosion inhibition behaviour of synthetic 2-(phenylsulphonamido)-3-methylbutanoic acid on mild steel in alkaline solution

Chinonso Blessing Adindu *

Department of Chemistry, Imo State University Owerri, Nigeria.
 
Research Article
International Journal of Science and Research Archive, 2023, 09(02), 108–115.
Article DOI: 10.30574/ijsra.2023.9.2.0520
Publication history: 
Received on 23 May 2023; revised on 01 July 2023; accepted on 04 July 2023
 
Abstract: 
The corrosion inhibiting behaviour of synthetic 2-(phenylsulphonamido)-3-methylbutanoic acid (PSMBA) on mild steel in the presence of 0.1 M KOH was investigated using combined gravimetric, electrochemical and theoretical simulation corrosion monitoring methods. The gravimetric data showed that the inhibitor effectively protected the metal from alkaline corrosion and that the inhibition ability depended on concentration increase and reduced gradually with prolonged immersion time. The electrochemical impedance spectroscopy results show that the charge transfer resistance increased with the addition of the inhibitor while potentiodynamic polarization results showed that the corrosion current density decreased upon the addition of the inhibitor, theoretical simulation results revealed a low and comparable energy gap between the LUMO and HOMO energies. All these showed that 2-(phenylsulphonamido)-3-methylbutanoic acid functioned as a good corrosion inhibitor for mild steel in alkaline medium.
 
Keywords: 
Corrosion; 2-(phenylsulphonamido)-3-methylbutanoic acid; Mild steel; Inhibitor; Simulation
 
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