Inhibitive effect by natural Cyperus esculentus L. oil on the corrosion of A356.0-type Al-Si-Mg alloy in simulated seawater environment

The effect of cyperus esculentus l. oil as a corrosion inhibitor on the corrosion rate of a356.0-type al-si-mg alloy in simulated seawater environment was investigated using gravimetric method. the corrosion rates were studied in different concentrations of cyperus esculentus l. oil (0.2, 0.4, 0.6, and 0.8 g/v) at temperatures of 30, 50, and 700c. the results revealed that cyperus esculentus l. oil in 3.5% nacl-aluminium environment decreased the corrosion rate at various concentrations considered. results also showed that cyperusesculentus l. oil decreased the corrosion rate of al-si-mg alloy immersion time considered. the minimum inhibition efficiency was obtained at 700c while the maximum inhibition efficiency of 69.97% was achieved with 0.8g/v inhibitor concentration at 300c. cyperus esculentus l. oil acted as an effective corrosion inhibitor for al-si-mg alloy within the temperature and concentration range studied. the results demonstrated that cyperus esculentus l. oil adsorbed on the surface of al-si-mg alloy and obeyed langmuir adsorptionisotherm