Christine Bolo, Archie P. Amba, Geelyn Raeanne C. Rellin, Jayfe Anthony Abrea
AbreaPhilippine Science High School, 6021, Argao, Cebu, Philippines.
Abstract: Corrosion inhibition is usually done through means of commercialized products such as paint. However, due to the desire in finding a close substitute, green inhibitors were made and tested through means of experimentation. The corrosion inhibition efficiency of Citrus microcarpa (Calamansi) leaf extract on mild steel in 1.0 M hydrochloric acid was investigated under ambient temperature. Different concentrations of the leaf extract were prepared (0.02, 0.04, 0.06, 0.08 g/mL) alongside with 1.0 M hydrochloric acid as the control solution. The mild steel samples were immersed in these solutions, monitored in a 192 – hour duration and the corrosion inhibition efficiencies were calculated using the mass loss method. The results showed significant inhibition efficiencies greater than 70% for all extract concentrations with respect to the control. The highest obtained inhibition efficiency was 97.40±0.218% at 0.08 g/mL extract concentration. This corrosion inhibition was implied to undergo chemisorption mechanism process with adsorption isotherm models that fit to both from Lanmguir and Freundlich (R2 values > 0.99). The results also showed that the corrosion and its inhibition process fit best in zero – order kinetics where the residual mild steel mass is proportionate with time (R2 values > 0.98). The Citrus microcarpa (Calamansi) leaf extract therefore serves as an effective corrosion inhibitor of mild steel in hydrochloric acid media.
Keywords: corrosion, mild steel, calamansi, weight loss.
Pages: 49 – 57 | Full PDF Paper