Abstract: The inhibition effect of N-Salicylideneaniline Schiff base against AZ91D alloy corrosion in 0.01 M HCl was examined using potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) methods. The current of both the anodic and cathodic reactions of the corrosion process were decreased while the values of the corrosion potential were not changed significantly indicating that the Schiff base compound acts as mixed–type corrosion inhibitor. EIS measurements were also confirmed the inhibition effect of the Schiff base against AZ91D alloy corrosion. As the inhibitor concentration increased the polarization resistance increased due to more inhibitor adsorption on the surface. Moreover, Scanning Electron Microscopy (SEM), and X–Ray diffraction (XRD) have been used to investigate the corrosion inhibition of the Schiff base compound. SEM images showed that the corrosion damage of the alloy surface reduced in the presence of the Schiff base. The intensity of the characteristic XRD peaks of α phase of the AZ91D alloy was increased in the presence of the Schiff base compound indicating lower corrosion of the alloy sample due to the inhibition effect.
Keywords: magnesium alloy, corrosion inhibition, schiff base, eis, sem, xrd
