The Inhibition Effect of Polyethylenimine (PEI) on Pitting Corrosion of 304 Austenitic Stainless Steel in 3.5% NaCl Solution

One of the problems in the case of stainless steels is their low corrosion resistance against pitting corrosionin chloride containing environments, thereby leading to severe damage to industries. in this research, the pittingcorrosion of 304 austenitic stainless steel was studied in 3.5% nacl solution at room temperature (25?c) byperforming electrochemical measurements (containing cyclic polarization and electrochemical impedancespectroscopy) and immersion measurements. moreover, the effect of adding different concentrations of peiinhibitor with two mean molar masses (2000 and 60,000 g/mol) on pitting corrosion was investigated. finally,the adsorption behavior of this inhibitor on the alloy surface was investigated by atr-ft.ir and afm methods.it was observed that both inhibitors prevented uniform and pitting corrosion successfully, but pei (60,000 g/mol)had better inhibition efficiency than pei (2000 g/mol).