The effect of green inhibitor extracts on the corrosion behavior of carbon steel in 1 M HCl solution was systematically investigated using the weight loss method. The study revealed that the inhibition efficiency of the green extracts increases significantly with increasing inhibitor concentration, indicating that higher amounts of the extract provide better surface coverage and protection against acid attack. Conversely, the inhibition efficiency decreases as the temperature rises, suggesting that higher temperatures may enhance the corrosion rate and weaken the adsorption of the inhibitor molecules on the metal surface.
Adsorption studies demonstrated that the investigated green inhibitor extracts adhere to the carbon steel surface according to the Langmuir adsorption isotherm, indicating the formation of a monolayer of inhibitor molecules without interaction between the adsorbed species. These findings highlight the potential of green plant-based extracts as effective, eco-friendly corrosion inhibitors for carbon steel in acidic environments. Furthermore, the results suggest that careful optimization of inhibitor concentration and consideration of operating temperatures are critical for maximizing corrosion protection in practical applications.