Fractal characteristic analysis of electrochemical noise with wavelet transform

Liu, Xianfei; Wang, H.G.; Gu, Hongbo

doi:10.1016/j.corsci.2005.06.001

Cited by 38 publications

(15 citation statements)

References 30 publications

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“…Also a variety of analytical methods such as statistical functions [15,16], wavelet analysis [17][18][19], fractal analysis [20][21][22], artificial neural network [23,24], cluster and discriminant [25,26] and shot noise analyses [27] have been implemented mainly in order to acquire mechanistic information about the under-film corrosion process such as active/passive state of substrate, formation of corrosion product and the corrosion type taking place at the organic coating/metal interface. However, in coated metal systems with even a moderately protective organic coating, the current and hence the current noise is mainly controlled by transport of ionic species through the organic film.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electrochemical noise measurement on an organically coated metal

Jamali

Mills

Cottis

et al. 2016

Progress in Organic Coatings

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Electrochemical noise measurement (ENM) has found a credible place among the electrochemical methods applied to organic coatings, with a large number of reports in the literature of using the technique as a reliable method for the evaluation of the corrosion protection afforded by an organic coating on a metal surface. This has commonly been performed by calculating the noise resistance, Rn, or spectral noise resistance, Rsn, from the two main elements of electrochemical noise signal, the electrochemical current noise and potential noise. Several studies have shown that in practice Rn is a good measure of corrosion protection provided by an organic coating and affords good agreement with other measures of corrosion resistance from more established methods such as electrochemical impedance spectroscopy and DC resistance measurement. However, the theory of the electrochemical noise signal has not been fully analysed to elucidate the influence of the coating on the noise acquired. In this study a mathematical model is advanced in accordance with the equivalent electrical model in an electrochemical system consisting of a corroding metal substrate which has on it an organic coating. Experiments are also performed to evaluate the presented model in practice. Results of both theoretical and physical modelling show that potential noise is not influenced by the effect of coating while the current noise is attenuated due to the large impedance of coating.

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Section: Introductionmentioning

confidence: 99%

Analysis of electrochemical noise measurement on an organically coated metal

Jamali

Mills

Cottis

et al. 2016

Progress in Organic Coatings

View full text Add to dashboard Cite

show abstract

“…To conveniently use SVD, a Hankel matrix is constructed with wavelet decomposition approximate signals and applying formula Formula (10). Suppose that cðiÞ is an approximate signal.…”

Section: Svd and Its Reconstruction Theorymentioning

confidence: 99%

“…While effective for small quantities, wavelet decomposition of large data volumes often leads to difficulty in judging the data processing result in practice. Therefore, post-processing methods of wavelet decomposition such as wavelet scale energy statistical analysis [6][7][8], wavelet fractal analysis [9][10][11][12], and wavelet singular value decomposition [13][14][15][16] have been fully developed. Because wavelet singular value decomposition has unique advantages in de-noising and eliminating correlations of signals, it has widely been used in fault diagnosis and image processing.…”

Section: Introductionmentioning

confidence: 99%

Dynamic unbalance detection of Cardan shaft in high-speed train applying double decomposition and double reconstruction method

Ding

Lin

2015

Measurement

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“…Wavelet analysis is a relatively new mathematical tool used to supplement conventional Fourier analysis, and does not have some of the inherent inadequacies related to Fourier approach. Electrochemical noise measurements "ENM" have revealed great advantages in the field and have also been intensively applied in the processing of electrochemical signals by many authors [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. One important application of the wavelet transform to the EN analysis is the detection of transients [29,33,34].…”

Section: Introductionmentioning

confidence: 99%