Electrochemical noise analysis of the corrosion of AZ91D magnesium alloy in alkaline chloride solution

Zhang, Tao; Shao, Yawei; Meng, Guozhe; Wang, Fuhui

doi:10.1016/j.electacta.2007.07.014

Cited by 112 publications

(76 citation statements)

References 26 publications

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“…The value of 1/R n was proportional to the corrosion rate which was calculated instantaneously [15][16][17][18]. The Fig.…”

Section: En Transients and Noise Resistancementioning

confidence: 99%

“…EN shows some advantages compared to the common electrochemical techniques: first, EN is able to instantaneously monitor the rate of the corrosion process [15][16][17][18][19][20]; second, EN is carried out without artificial disturbance of the system [15][16][17][18][19][20]; last, EN can provide more information of localized corrosion than conventional techniques [21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical noise analysis on the crevice corrosion behavior of Ni–Cr–Mo–V high strength steel using recurrence plots

et al. 2010

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This article makes a study of electrochemical noise analysis on the crevice corrosion behavior of Ni-CrMo-V high strength steel using recurrence plots. The crevice corrosion behavior of Ni-Cr-Mo-V high strength steel was investigated by the electrochemical noise (EN) technique and SEM observation. The experimental results reveal that the crevice corrosion could be distinguished by three stages including induction stage, transformation stage, and stable stage. While increasing the growth probability of metastable corrosion, the presence of crevice decreases the initiation rate of metastable corrosion. In the case of crevice, the metastable corrosion is easy to develop into stable one.

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“…The value of 1/R n was proportional to the corrosion rate which was calculated instantaneously [15][16][17][18]. The Fig.…”

Section: En Transients and Noise Resistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical noise analysis on the crevice corrosion behavior of Ni–Cr–Mo–V high strength steel using recurrence plots

et al. 2010

Self Cite

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“…These properties entice automobile manufacturers to replace denser materials by magnesium-based alloys [1,2]. However, the high reactive nature of magnesium makes it highly susceptible to corrosion in aggressive media, especially in electrolytes containing Cl À [3]. It will form a galvanic corrosion system with another metal and even a micro-galvanic corrosion system with secondary phases (a-phase and/or b-phase) and impurity grains [4,5] in an aqueous environment, which restrict the wide applications in large-scales of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of inorganic and organic coatings on AZ91D magnesium alloy with electroless plating pretreatment

Zhang

Yang

et al. 2011

Materials & Corrosion

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In this paper, a protective coating scheme was applied for the corrosion protection of AZ91D magnesium alloy. Electroless Ni coating (EN coating) as bottom layer, electrodeposited Ni coating (ENN coating), and silane-based coating (ENS coating) as top layer, respectively, were successfully prepared on AZ91D magnesium alloy by combination techniques. Scanning electron microscopy and X-ray diffraction were employed to investigate the surface and phase structure of coatings, respectively. The electrochemical corrosion behaviors of coatings in neutral 3.5 wt% NaCl solution were evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization techniques. The corrosion testing showed that the three kinds of coatings all could provide corrosion protection for AZ91D magnesium alloy to a certain extent, and the corrosion resistance of ENN and ENS was superior to EN. In order to further study the corrosion protection properties of ENN and ENS, a comparative investigation on the evolution of EIS of ENN and ENS was carried out by dint of immersion test in neutral 3.5 wt% NaCl solution. The results indicated that, compared with ENN, the ENS could provide longer corrosion protection for AZ91D magnesium alloy. It is significant to determine the barrier effect of each coating, which could provide reference for industry applications.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

2018

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A potentially powerful tool to detect and classify corrosion mechanisms is the analysis of electrochemical noise (EN). Data analysis in the time-frequency domain using e.g. continuous wavelet transform (CWT) allows the extraction of localized frequency information, providing information on the type of corrosion, i.e. uniform or localized corrosion, from the EN signal. The CWT provides the opportunity to analyse changes in frequency behavior of electrochemical noise signals over time. In the presence of transients generated by pitting corrosion that occur only during short instants of time, this is an important property. This paper introduces the combination of automated transient detection with wavelet transform modulus maxima (WTMM) and the Holder exponent. WTMM enhances the determination of transient frequencies by indicating the ridges of a CWT spectrum. The Holder exponent, a measure of singularity of an EN signal, provides a single parameter discrimination tool based on WTMM and serves to differentiate between general corrosion and two types of pitting corrosion of stainless steel AISI304 exposed to aqueous HCl solutions of different concentrations and as such at different pH values.

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Electrochemical noise analysis of the corrosion of AZ91D magnesium alloy in alkaline chloride solution

Cited by 112 publications

References 26 publications

Electrochemical noise analysis on the crevice corrosion behavior of Ni–Cr–Mo–V high strength steel using recurrence plots

Electrochemical noise analysis on the crevice corrosion behavior of Ni–Cr–Mo–V high strength steel using recurrence plots

Preparation and characterization of inorganic and organic coatings on AZ91D magnesium alloy with electroless plating pretreatment

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

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