Corrosion inhibition studies of tamarind shell tannins on mild steel in acidic medium

Name: Abdullahi, Abdulmajid

Organization : Hassan Usman Katsina Polytechnic. College of Science and Technology

Name: Hussin, M. Hazwan

Organization : Universiti Sains Malaysia. School of Chemical Sciences

Email : mhh.usm@gmail.com

LCSH: Corrosion and anti-corrosives

LCSH: Steel -- Corrosion

LCSH: Mild steel -- Corrosion

LCSH: Tannins

Abstract: The tamarind shell tannins was characterized and studied for possible use in corrosion inhibition. Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and thermal gravimetric analysis (TGA), were applied to study tamarind shell tannins. The extraction yield (15.56%) of tamarind water extract (TWE) was rich in condensed tannins. Also, the FTIR and NMR studies established the occurrence of tannins. The inhibition studies on corrosion mitigation were observed using electrochemical impedance spectroscopy (EIS), potentiodynamic polarisation (PD), and electrochemical noise measurement (ENM) analysis. The inhibition efficiency was due to the increase in concentration of the extract up to 1000 ppm. The inhibition efficiency was 83.57%. Potentiodynamic polarization analysis revealed that (TWE) extract was mixed type corrosion inhibitor with major influence at cathodic sites. Nyquist plots presented that there was an increase in the resistance of charge transfer values as well as the decrease in constant phase element (CPE) as the concentrations of extract increases. The extracts study on adsorption followed Langmuir isotherm. The extract molecules were adsorbed on the mild steel surface physically with a free energy absorption of ΔGads TWE = −20.03 kJ mol−1. Furthermore, the surface morphology and elemental composition studies using SEM and EDX, confirmed the adsorption of the extracts.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2024

Modified: 2024-12-04

Issued: 2024-12-04

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BibliograpyCitation : In Kasetsart University. Faculty of Science. The Pure and Applied Chemistry International Conference 2024 (PACCON 2024) (pp.761-769). Bangkok : Kasetsart University, 2024

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