Use of Erythrina Variegata Linn as green corrosion inhibitor for steel in 0.5 M Sulphuric acid

Abstract

The potential anti-corrosion effect of Erythrina Variegata Linn leaf extract on steel in 0.5 M H₂SO₄ solution is investigated in this work. On the steel surface, the extract created a layer of protection, which showed maximal efficiency in resisting the corrosion at 88.88%, this was particularly evident at a 1000 mg/L concentration. To verify its potential to inhibit corrosion, a range of analytical methods were used, such as UV, SEM, phytochemical screening, electrochemical measurements, and quantum chemical investigations. The presence of double bonds and heteroatoms in the chemical constituent is responsible for inhibiting corrosion. Instrumentation such as UV analysis provides detailed insights into molecular interactions, aiding in the understanding of inhibitive mechanisms. The corrosion inhibition capacity rises up on increasing Erythrina Variegata Linn till 1000 ppm. Based upon quantum chemical calculations, 6‑hydroxy genistein has more adsorption capacity than Alpinum Isoflavone. This investigation determined the potential utility of Erythrina Variegata Linn leaf extract as a sustainable, environmentally benign inhibitor of steel corrosion in harsh environments like 0.5 M H₂SO_4.