Investigation of the Effect of Vanillin as a Green Corrosion Inhibitor for Stainless Steel Using Electrochemical Techniques

Abstract

Vanillin offers interesting possibilities for corrosion inhibition because of its safe use and high<br />solubility in water. The effect of vanillin on the corrosion inhibition of AISI 304 stainless steel in<br />0.5M H2SO4 solution has been studied using potentiodynamic polarization and electrochemical<br />impedance spectroscopy (EIS). Furthermore, this paper demonstrates that the electrochemical noise<br />(EN) technique under open circuit conditions as the only truly noninvasive electrochemical method<br />can be applied to investigate the corrosion inhibition. According to calculation of the total amount of<br />noise charges due to all partial signals resulted from wavelet analysis of EN current data, it is<br />possible to obtain the inhibition efficiency (IE) of an inhibitor. These IE values show a reasonable<br />agreement with those obtained from potentiodynamic polarization and EIS measurements.