Evaluation of Some Organic Compounds Containing O, N and S Atoms as Corrosion Inhibitors for Stainless Steel 304 in Acid Solutions

The corrosion protection of stainless steel 304 (SS 304) in molar HCl solutions utilized by 
some organic compounds has been investigated by (WR) weight reduction,(EFM) 
electrochemical frequency modulation,(EIS) electrochemical impedance spectroscopy,(PP) 
potentiodynamic polarization tests and (AFM) atomic force microscope. It was found that 
inhibition rise with improving inhibitor dose and break down with temperature rising. The 
adsorption of organic compounds on SS 304 surface follows the Temkin's isotherm. PP 
experiments were performed at different solutions showed that these compounds act as 
mixed-kind inhibitors.