CORROSION INHIBITION OF THE AZ91D MAGNESIUM ALLOY BY N-SALICYLIDENEANILINE SCHIF BASE COMPOUND

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

The inhibition of steel corrosion in hydrochloric acid solution by juice of Prunus cerasus

Prunus cerasus juice inhibition effects on the corrosion of steel in hydrochloric acid (HCl) solution were investigated using polarization and electrochemical impendence techniques. The results revealed that Prunus cerasus juice acts as a corrosion inhibitor in HCl solution. The inhibition efficiency increased with an increase in inhibitor concentration. The inhibition is attributed to adsorption of the inhibitor on the steel surface

Formation of rare earth-permanganate conversion coating on AZ61 magnesium alloy and its properties

210-216Formation of cerium-lanthanum-permanganate composite conversion coating on AZ61 magnesium has been studied. Morphology of the coated and uncoated alloy samples has been studied by scanning electron microscopy before and after immersion in corrosive media. Energy dispersive X-ray shows that the coatings are composed of oxides and hydroxides of cerium, lanthanum and manganese. The anticorrosive properties of the coatings are investigated by potentiodynamic polarization and electrochemical impedance spectroscopy in diluted sodium sulfate and also in 3.5% sodium chloride solutions. The results indicate that the corrosion resistance of the coated samples is significantly higher than the bare alloy in studied solutions. The effect of plating time on coating resistance is investigated in order to find the optimum treatment time and the best results are found for 60 min plating