Analysis of pitting corrosion behavior of pure Al in sodium chloride solution with the wavelet technique

Wavelet Transform Modulus Maxima and Holder Exponents Combined with Transient Detection for the Differentiation of Pitting Corrosion Using Electrochemical Noise

“…The energy present in those timescales could in turn be associated with the dominance of activation-or diffusion controlled processes, or processes under mixed control [7,9,16,18,21,[23][24][25][26][27][28][29][30]. Larger timescales are related with relatively slow processes, whereas smaller timescales are related to faster processes [18,[24][25][26]28]. The relation between spectral and wavelet techniques for the analysis of EN has been described earlier by Cottis [22].…”

“…For non-stationary signals traditional frequency analysis becomes inappropriate because of this property. In many other papers the Discrete Wavelet Transform (DWT) has been used for analyzing EN signals [9,18,21,[23][24][25][26][27][28], firstly introduced for the analysis of EN by Aballe et al [21]. The DWT describes the original EN signal using a linear combination of oscillations with a limited time span, called wavelets.…”

“…Due to the scaling process, after each iteration, lower frequencies are described. In other words, DWT analyses the EN signal using a pre-defined number of timescales by scaling and translation of wavelets [9,18,21,[23][24][25][26][27][28]. The energy present in those timescales could in turn be associated with the dominance of activation-or diffusion controlled processes, or processes under mixed control [7,9,16,18,21,[23][24][25][26][27][28][29][30].…”

The Influence of Transition Metals Addition on the Corrosion Resistance of Nanocrystalline Al Alloys Produced by Mechanical Alloying

“…The coarse grained Al and its alloys exhibit excellent corrosion resistant properties due to the formation of an oxide layer [1, 2,[8][9][10][11][12][13]. However, when exposed to harsh atmospheric conditions or in a medium such as chloride solution, Al experiences uniform and pitting corrosion [12][13][14].…”

“…However, when exposed to harsh atmospheric conditions or in a medium such as chloride solution, Al experiences uniform and pitting corrosion [12][13][14].…”