Effect of garlic extract as corrosion inhibitor for copper in acidic medium

The inhibitive effect of garlic extract on copper alloy corrosion in HNO3 acid solutions were studied by using weight loss methods. According to the findings, the extract was effective and very good inhibitors in the acidic media. In this study, the    temperature influence was investigated on the corrosion efficacy in which there is (no) extract, and finally thermodynamic activation and adsorption parameters were determined. The results of every method used in this study showed a good agreement, We utilized the Langmuir adsorption isotherm to fit experimental data and the obtained adsorption Gibb’s free energy values and signs indicated the spontaneous adsorption of inhibitor molecules on copper surfaces by the mechanism of physical adsorption.