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Abstract
Sodium tungstate (Na 2WO 4) 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 Na 2WO 4 is capable of inhibiting the corrosion of CRS in PAA solution. Polarization data show that Na 2WO 4 behaves as an anodic type inhibitor in PAA solution. Adsorption of Na 2WO 4 is found to follow the Temkin adsorption isotherm. The calculated free energy of adsorption (Δ G ads) probably indicates that both physical adsorption and chemical adsorption may take place in the adsorption process.
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