Novel quantitative method for evaluation pitting corrosion and pitting corrosion inhibition of carbon steel using electrochemical noise analysis

The electrochemical noise of N80 steel in sodium chloride solution containing 0.5 M bicarbonate with and without inhibitor was recorded. The current signal which corresponded to pitting corrosion was extracted from the records based on wavelet transform, then the intergraded current was calculated. Comparing with the intergraded current with and without inhibitor, the inhibition efficiency on pitting corrosion was calculated. Electrochemical impedance spectroscopy (EIS) measurements were also done to validate the electrochemical noise analysis results. From this paper, it was shown that pitting corrosion and inhibition efficiency on pitting corrosion could be evaluated accurately and quantitatively through intergrading pitting corrosion current which extracted based on wavelet transform. C 2005 Springer Science + Business Media, Inc.