Inhibitive properties, thermodynamic and quantum chemical studies of alloxazine on mild steel corrosion in H2SO4 |
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| Authors: | NO Obi-Egbedi IB Obot |
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| Affiliation: | aDepartment of Chemistry, University of Ibadan, Ibadan, Nigeria;bDepartment of Chemistry, Faculty of Science, University of Uyo, P.M.B. 1017, Uyo, Akwa Ibom State, Nigeria |
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| Abstract: | Alloxazine (ALLOX) was tested as corrosion inhibitor for mild steel in 0.5 M H2SO4 solution using non-electrochemical technique (gravimetric and UV–Visible spectrophotometric measurements) at 303–333 K. ALLOX acts as inhibitor for mild steel in acidic medium. Inhibition efficiency increases with increase in concentration of ALLOX but decrease with rise in temperature. The adsorption of ALLOX was found to follow Temkin adsorption isotherm model. Both the activation and thermodynamic parameters governing the adsorption process were calculated and discussed. The adsorption follows a first-order kinetics. DFT study gave further insight into the mechanism of inhibition action of ALLOX. |
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| Keywords: | A Alloxazine B Mild steel C Sulphuric acid D Density functional theory (DFT) |
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