Spectrum Analysis of Corrosion Potential Fluctuations for Localized Corrosion of Type 304 Stainless Steel
- 1 December 1987
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 134 (12) , 2993-2997
- https://doi.org/10.1149/1.2100328
Abstract
Fluctuations of corrosion potential have been analyzed for localized corrosion of Type 304 stainless steel immersed in solutions containing . Potential fluctuations were sampled by a microcomputer, and power spectra were calculated by the fast Fourier transform (FFT). Acoustic emission (AE) was also measured to investigate origins of the potential fluctuations. It was found that formation and repassivation of micropits was confirmed by the potential fluctuations in the form of rapid drop followed by slow rise. When crevice corrosion was proceeding, potential fluctuations in the form of rapid rise followed by slow drop were observed. The absolute values of the slope of power spectral density (psd) for formation and repassivation of micropits were smaller than those for crevice corrosion in the frequency range of 0.01–0.1 Hz.Keywords
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