Investigation of the corrosion inhibition potential of Axonopus compressus (Carpet grass) Extract on Mild steel in 〖C0〗_2corrosive media

Corrosion remains a formidable challenge in process plants, necessitating eco-friendly mitigation strategies. This study explores the potential of Axonopus compressus (Carpet grass) extract as a corrosion inhibitor for mild steel in a  saline environment. 

The aim is to advance the understanding of environmentally friendly corrosion inhibitors in a CO₂ saline environment, containing 3.5% NaCl. The project's objectives encompass phytochemical extraction, characterization, and corrosion inhibition potential evaluation. The extraction of Axonopus compressus was conducted through the solvent extraction method employing methanol. Various concentrations of the extract were subjected to testing within a temperature of 30°C and 60°C, pH of 6.0, and for an immersion period of 163 hours. The corrosion inhibition assessment utilized the gravimetric (Weight Loss) method.

The results of the experiments revealed a remarkable corrosion inhibition efficiency of 93% at a temperature of 30°C and concentration of 2.8g in 100ml of solution for the Axonopus compressus extract. At 60°C, the corrosion rate was found to increase significantly, and the inhibition efficiency decreased slightly, particularly at lower concentrations, though high concentrations still maintained substantial protective effects. Notably, the inhibition efficiency exhibited a positive correlation with the concentration of the extract. As the concentration increased, the inhibitive effect on corrosion demonstrated a corresponding enhancement. The adsorption isotherm for the adsorption of Axonopus compressus extract on the steel surface was found to follow the Langmuir adsorption isotherm.