The effect of mango bark and leaf extract solution additives on the corrosion inhibition of mild steel in dilute sulphuric acid - Part 2

The performance of bark and leaf solution extracts of mango (Mangifera Indica) on the corrosion inhibition of mild steel test specimen immersed in 0.2 M dilute sulfuric acid at ambient temperature was experimentally studied using the weight-loss method and potential measurement technique. At concentrations of 1 mL for the bark and 0.5 mL for the leaf in 100 mL of the acid, the juice solution extracts of mango from the bark and leaves could separately inhibit corrosion of mild steel. However, the effective inhibition performance at these two concentrations was below average. The best corrosion inhibition performance (70.15% inhibitor efficieny) was achieved using a combination of the two solution extracts, i.e., the bark and leaf together, at a concentration of 1 mL of the combined extracts/100 mL of sulfuric acid. This combined solution extract was also effective for corrosion inhibition at the lower concentration of 0.2 and 0.5 mL/100 mL of the acid, but the magnitude of inhibitive efficiency was below average.