Investigation of Mango (Mangnifera Indica) Extract as Zinc Corrosion Inhibitor in a Sodium Hydroxide Medium

This work examined MLE as Zn corrosion inhibitor in a NaOH medium. MLE was subjected to qualitative and quantitative Pc analyses. Thermometric and gravimetric techniques were employed in the corrosion inhibition study. In the thermometric method, reaction numbers for Zn dissolution in blank and inhibited NaOH media were used to determine MLE IE(%). The gravimetric method was carried out using one factor at a time and RSM. CCD of DES was employed in RSM. The analyses of the experimental results revealed that MLE was predominantly made up of flavonoids, alkaloids and tannins (471.7, 458.3 and 115.0 mg/100 g, respectively). Zn  by the extract increased with higher inhibitor C, but decreased with a rise in T. A quadratic model adequately described the relationship between IE(%), C, T and time factors. High IE(%) of 83.75% was obtained at an inhibitor C of 1.0 g/L, T of 303 K and IT of 5 h. Hence, MLE is a suitable inhibitor for Zn corrosion in a NaOH medium.