ELECTROCHEMICAL AND CHARACTERIZATION OF ETHYL ACETATE EXTRACT OF TAMARINDUS INDICA L SHELL AS A CORROSION INHIBITOR FOR LOW CARBON STEEL IN 0.5 M HCL MEDIUM (KEY IJP************598)

• Abdulmajid Abdullahi, Shamsuddeen Abdullahi, M. Hazwan Hussin

Abstract

Ethyl acetate extract of Tamarind shell (EAETS) has been examined as a corrosion inhibitor for law carbon steel (LCS) in 0.5 M HCl. Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and thermal gravimetric study (TGA), were carried out to characterize the (EAETS). The extraction yield 2.23% of condensed tannins. Also, FTIR and NMR analysis established the occurrence of tannins. Electrochemical impedance spectroscopy and potentiodynamic polarization method were applied to observe the inhibition performance of (EAETS). The inhibition efficacy of EAETS was experimental to be rising with increasing concentration of the extract. As the extract constituents settled on the low carbon substrate, inhibition efficiency also increases and lastly reached 81.11% at an extract concentration of 1000 ppm. PD curves of the extract were mixed-type inhibitors. The adsorption type of EAETS was found following Langmuir adsorption. Surface morphology analyses (SEMEDX) displayed corrosion-inhibitive properties of the samples.