Sinapis Alba Extract as Green Corrosion Inhibitor for Aluminum in Alkaline Media

摘要

The inhibition effect of sinapis alba (SA) extract on the corrosion of aluminum in 1.0 M sodiumhydroxide (NaOH) was investigated using weight-loss measurements, and electrochemical polarizationmethods; also, surface morphology was analyzed by scanning electron microscopy (SEM) technique.The results show that sinapis alba extract is a good inhibitor, and the inhibition efficiency increaseswith inhibitor (sinapis alba extract) concentration, and slightly increases with increasing temperature.The inhibition efficiency reaches a maximum value of 97.98% with the highest extract concentration at50C. In the presence of sinapis alba extract, the results were indicative of slightly decreasedaluminum dissolution with increasing temperature. The adsorption of sinapis alba extract on aluminumsurface obeys Langmuir adsorption isotherm, with high regression coefficient value.