Abstract
The performance of millet starch (MS) in controlling the corrosion of mild steel in 0.5 M HCl solution at 30 ± 1 °C was investigated using potentiodynamic polarization, gravimetric, thermometric and mathematical simulation technique. Data obtained from gravimetric and thermometric results revealed that MS inhibited corrosion of mild steel in the acid solution and increase in inhibition efficiency was concentration dependent for all the concentrations of MS investigated. The mode of adsorption of MS on the mild steel surface obeyed Langmuir adsorption isotherm. The potentiodynamic polarization result indicates that MS act as a mixed type inhibitor with absolute control on the cathodic partial reaction. The thermodynamic parameters (∆H ads, ∆S ads, ∆G ads and E a) for the inhibition process were calculated, and the results obtained supported the proposed physical adsorption mechanism. The mathematical simulation technique was used to evaluate the correlation between the inhibition efficiency of MS and its electronic molecular structure. The results show that there is a satisfactory agreement between mathematical simulation technique and experimental data.
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The contribution of Electrochemistry and Materials Science Research Laboratory, Federal University of Technology, Owerri, Nigeria and Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China in making this research successful is highly appreciated. Also, the authors are grateful to Ezeh Comas, Okoro Chinweike and Adika Precious for their assistance in carrying out some measurements.
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Nwanonenyi, S.C., Arukalam, I.O., Obasi, H.C. et al. Corrosion Inhibitive Behavior and Adsorption of Millet (Panicum miliaceum) Starch on Mild Steel in Hydrochloric Acid Environment. J Bio Tribo Corros 3, 54 (2017). https://doi.org/10.1007/s40735-017-0115-y
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DOI: https://doi.org/10.1007/s40735-017-0115-y