Analysis of Electrochemical Noise Data of Stress Corrosion Cracking of High-Strength Carbon Steel in Acidified NaCl Solution
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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.
KeywordsHigh-strength carbon steel Electrochemical noise Potential Stress corrosion cracking
The author acknowledges the scholarship support of the Federal Government of Nigeria at the time this research was performed. The laboratory support of the Corrosion and Protection Centre, University of Manchester, is also acknowledged.
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