INHIBITIVE STUDIES OF AZADIRACHTA INDICA (AI) BARK EXTRACT AS CORROSION INHIBITOR FOR ZINC IN 0.75 M HNO3 SOLUTION: ADSORPTION THERMODYNAMICS AND KINETIC STUDY

Saifullahi Lawal Muhammad; Muhammad  Bashir Ibrahim

doi:10.4314/jfas.1354

Authors

Saifullahi Lawal Muhammad Department of Chemistry, Federal University, Gashua, Yobe, Nigeria
Muhammad Bashir Ibrahim Department of Pure and Industrial Chemistry, Bayero University, Kano, Nigeria

DOI:

https://doi.org/10.4314/jfas.1354

Keywords:

Zinc, Corrosion, Inhibitor, Azadirachta indica (AI) bark extract, Adsorption

Abstract

The study employed FT-IR, SEM, and gravimetric weight loss measurement to examine the inhibitive effect and adsorption behavior of azadirachta indica bark extract on zinc metal in a 0.75 M HNO3 solution. The study measured weight loss in a 0.75 M nitric acid solution at four different temperatures (303-333K) and four different inhibitor concentrations (0.20-0.80g/L). The outcome of the experimental analysis demonstrates that while the extracts' inhibitory efficiency rises with increasing concentrations of the inhibitor, it falls with rising temperatures. FT-IR and SEM analysis verified that the adsorption of inhibitor molecules onto the metal surface reduces zinc corrosion in nitric acid solution. An analysis of adsorption isotherms demonstrates that experimental data follow the Freundlich isotherm and that adsorption mechanism follows physisorption. Thermodynamic studies on adsorption revealed a spontaneous and feasible process based on a negative value of ΔG_ads.

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