Corrosion Inhibition Potential of Lagenaria breviflora (Christmas melon) Leaf Extract on Aluminium in Hydrochloric Acid Environment

Abstract

The objective of this paper was to investigate the corrosion inhibition potential of Lageneria breviflora (Christmas melon) leaf extract (LELB) on aluminium in 0.5M hydrochloric acid environment using weight loss method. Data obtained from phytochemical constituents LELB reveals the presence of tannins, diterpenes, sterols, flavonoids, cardiac glycosides, and phenols. FT-IR analysis indicates O-H and N-H stretching vibrations identified in the 3193.73 cm^-1 range and S-C=N stretching vibrations in the 2163.89 to 2114.61cm^-1 range. The C-N bond stretching vibration was observed around 1243.19 cm-^1, whereas the N-H bond vibration was noted at about 1592.20 cm^-1. The C-I functional group was assigned the absorption bands seen at 523 cm^-1. Weight loss analysis indicates that LELB extract had 68% corrosion inhibition efficiency for aluminium in 0.5M hydrochloric acid environment. Thermodynamic parameters and activation energy were also evaluated. Fourier transform infrared spectroscopy (FTIR) analysis confirmed the formation of an adsorbed protective film on the aluminium surface. The findings suggest that lagenaria breviflora leaf extract could be an effective corrosion inhibitor for aluminium in hydrochloric acid solutions.