Analysis of Electrochemical Noise Data of Stress Corrosion Cracking of High-Strength Carbon Steel in Acidified NaCl Solution

Analysis of Electrochemical Noise Data of Stress Corrosion Cracking of High-Strength Carbon Steel... Electrochemical noise data generated during the stress corrosion cracking (SCC) experiments under free corrosion potential performed on a high-strength carbon steel exposed to acidified sodium chloride solution and poisoned with sodium sulfide have been statistically analyzed. The electrochemical noise, observed as spontaneous potential fluctuations, was analyzed using the maximum entropy method and the discrete Fourier transform. In all the specimens tested, a low-frequency (LF) noise was obtained which characteristically indicated LF or flicker noise. Throughout the experiments, consistent noise behavior was observed, with the only significant perturbation being that associated with major transients that occurred when the specimens actually failed. In the statistical analysis of results, all the parameters used bear close correlations with the spectral density curves, noise amplitudes and the roll-off slopes. For this alloy, the results obtained from the electrochemical investigation and the scanning electron microscopy micrographs show the cracking behavior to be consistent with the hydrogen-induced cracking. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Failure Analysis and Prevention Springer Journals

Analysis of Electrochemical Noise Data of Stress Corrosion Cracking of High-Strength Carbon Steel in Acidified NaCl Solution

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Publisher
Springer US
Copyright
Copyright © 2018 by ASM International
Subject
Materials Science; Tribology, Corrosion and Coatings; Characterization and Evaluation of Materials; Classical Mechanics; Structural Mechanics; Quality Control, Reliability, Safety and Risk
ISSN
1547-7029
eISSN
1864-1245
D.O.I.
10.1007/s11668-018-0463-z
Publisher site
See Article on Publisher Site

Abstract

Electrochemical noise data generated during the stress corrosion cracking (SCC) experiments under free corrosion potential performed on a high-strength carbon steel exposed to acidified sodium chloride solution and poisoned with sodium sulfide have been statistically analyzed. The electrochemical noise, observed as spontaneous potential fluctuations, was analyzed using the maximum entropy method and the discrete Fourier transform. In all the specimens tested, a low-frequency (LF) noise was obtained which characteristically indicated LF or flicker noise. Throughout the experiments, consistent noise behavior was observed, with the only significant perturbation being that associated with major transients that occurred when the specimens actually failed. In the statistical analysis of results, all the parameters used bear close correlations with the spectral density curves, noise amplitudes and the roll-off slopes. For this alloy, the results obtained from the electrochemical investigation and the scanning electron microscopy micrographs show the cracking behavior to be consistent with the hydrogen-induced cracking.

Journal

Journal of Failure Analysis and PreventionSpringer Journals

Published: Apr 12, 2018

References

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