Effect of Combining Moringa oleifera and Datura stramonium Extracts as a Green Corrosion Inhibitor for Mild Steel

The present investigation explores the effect of combining extracts from Moringa oleifera and Datura stramonium as an eco-friendly corrosion inhibitor for carbon steel in acidic media. The corrosion inhibition efficacy was systematically evaluated through gravimetric analysis and electrochemical techniques. The results reveal that Moringa oleifera exhibits the highest corrosion inhibition efficiency of 93.48%, followed by the combination of both plant extracts, which demonstrates superior protective performance compared to Datura stramonium alone consisting of 250 ppm Moringa oleifera leaf extract (MOLE) + 250 ppm Datura stramonium leaf extract (DSLE) at 60 °C, achieved an inhibition efficiency of 84.71%. Although slightly lower than the performance of MOLE alone, this result highlights the dominant contribution of MOLE within the blend and underscores its ability to enhance the protective effect of DSLE. This formulation enables the valorization of the otherwise toxic Datura stramonium by integrating it into a functional, eco-friendly corrosion inhibitor system. Surface characterization techniques corroborated the formation of a protective adsorbed film on the carbon steel substrate. The enhanced performance is postulated to arise from the combination effect between the diverse phytochemical constituents present in Moringa oleifera and Datura stramonium, which augment the adsorption kinetics and film-forming capabilities.