Sodium tungstate as a corrosion inhibitor of cold rolled steel in peracetic acid solution

Sodium tungstate (Na2WO4) as a corrosion inhibitor of cold rolled steel (CRS) in peracetic acid (PAA) solution was investigated by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). All the data obtained from the experiments indicate that Na2WO4 is capable of inhibiting the corrosion of CRS in PAA solution. Polarization data show that Na2WO4 behaves as an anodic type inhibitor in PAA solution. Adsorption of Na2WO4 is found to follow the Temkin adsorption isotherm. The calculated free energy of adsorption (ΔGads) probably indicates that both physical adsorption and chemical adsorption may take place in the adsorption process.