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Garlic Powder as a Safe Environment Green Corrosion Inhibitor for Mild Steel in Acidic Media; Adsorption and Quantum Chemical Studies |
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| Authors: | Aprael S Yaro Anees A Khadom Rafal K Wael |
| Institution: | 1. Chemical Engineering Department, College of Engineering, University of Baghdad, Aljadrea, Baghdad, Iraq;2. Chemical Engineering Department, College of Engineering, University of Diyala, Baquba City, Daiyla, Iraq |
| Abstract: | The corrosion inhibition of mild steel in H3PO4 solution by garlic powder was investigated using weight loss and polarization techniques. The adsorption of garlic powder was found to obey Langmuir adsorption isotherm. Maximum inhibition efficiency was 75% at 50 °C and 250 ppm inhibitor concentration. The values of heat of adsorption were negative indicating the spontaneous adsorption process. Quantum chemical calculations were used successfully to evaluate the theoretical inhibitor efficiency. Mathematical and statistical analyses were also used to represent the corrosion rate data with high correlation coefficients. Polarization measurements showed that garlic powder was a mixed — type inhibitor. |
| Keywords: | Adsorption Corrosion Mild steel Polarization Kinetics Quantum chemistry |