Evaluation of Curcuma Domestica Loir and Alpinia Galanga extract as an eco-friendly corrosion inhibitor for carbon steel in 0.5 M Hcl medium

Abstract

Much effort is being paid to the development of environmentally and ecologically sound or "green" corrosion inhibitors. The study's goal is to determine if the presence or absence of Curcuma Domestica Loir (CDL) and Alpinia Galanga (AG) extraction as an eco-friendly corrosion inhibitor in 0.5 M HCl medium affects the corrosion inhibition of low-carbon steel substrates. Weight loss experiments and corrosion rate measurements were used to evaluate the inhibitory performance for immersion times of 7, 14, 21, 28, and 35 days. Energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM) were employed to analyse the surface morphology of all samples and characterise the creation of the protective layer, corrosion products, and localised areas on the carbon steel substrate. After immersion test was revealed that about 85 % of the carbon steel surface was covered by green extract molecules, and the corrosion rate was reduced comparing to the sample exposed to blank solution. According to the study, CDL can inhibit carbon steel in an acidic medium, and the concentration of CDL is connected with the effectiveness of the inhibition. SEM examination of the surface of carbon steel indicated that through the formation of a protective film on the Fe surface, both extracts had an outstanding corrosion-inhibiting effect on the Fe anode. This study provides valuable insight into the development of green corrosion inhibitors for carbon steel.