Electrochemical techniques for delamination studies

Weijde, D.H. van der; Westing, E.P.M. van; Wit, J.H.W. de

doi:10.1016/0010-938x(94)90070-1

Cited by 74 publications

(18 citation statements)

References 3 publications

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“…6 shows the typical Nyquist plots of AZ31 magnesium alloys covered or not by anodic films. The EIS time constants are determined through the method developed by Wit and coworkers [21] and two time constants above the real axis of each Nyquist plot can be obtained. According to the study of Pebere et al [22], the high capacitive arc may originate from the discrete oxide film formed in the air for bare AZ31 and the oxide film for the anodized AZ31, respectively, while the medium frequency one may be attributed to the corrosion reaction.…”

Section: Characterization Of the Optimized Anodized Filmmentioning

confidence: 99%

Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

Zhang

Cao

et al. 2007

Applied Surface Science

129

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Section: Characterization Of the Optimized Anodized Filmmentioning

confidence: 99%

Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

Zhang

Cao

et al. 2007

Applied Surface Science

129

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“…1). Though the visual evaluation of the impedance data above the real axis, which is obtained at the high-medium frequency, yield only one time constant, the analysis of the data leads to the derivation of at least two time constants [13]. The number of time constants is determined by calculating the difference between the fitted and the experimental data as function of the frequency.…”

Section: Eis Featuresmentioning

confidence: 99%

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution

Guo-sheng

Chen

Fang

et al. 2010

Materials & Corrosion

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The pitting corrosion behavior of 7150 aluminum alloy was studied by electrochemical impedance spectroscopy (EIS) in the sodium chloride and hydrochloric acid solution. Based on EIS features and corrosion morphologies as well as corrosion potential, the process of pitting corrosion could be clearly divided into four stages: at the first stage, the Nyquist diagram was composed of two overlapping capacitive loops at the high-medial frequency and one inductive loop at the low frequency. At the second stage (metastable pits developing stage), there existed one small capacitive loop at the high frequency and one big capacitive loop at the medial frequency. At the third stage (stable pits developing stage), two time constants were more clearly distinguished, corresponding to two obvious capacitive loops. At the fourth stage, there appeared one capacitive loop, attributing to uniform corrosion. An equivalent circuit was designed to fit EIS, and the experimental results and the fitted results had good correspondence.

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“…It is the least destructive and the most informative electrochemical analysis available for monitoring the interfacial phenomena of insulation polymers and polymeric coatings [10][11][12][13][17][18][19][20][21][22] . This technique has also been applied effectively in the detection of microbial degradation of polymeric protective coatings 31,34,35,37) and fiber reinforced polymeric composites 12,13) . However, it has not been applied with any success to the monitoring of the degradation of degradable and water-permeable polymers due to the relatively high conductance of these polymers in experimental systems and extremely high sensitivity of the method.…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical impedance spectroscopy (EIS) is a nondestructive and informative technique commonly used in corrosion science and coating characterization for determining delimination and failure in corrosion coating resistance 6,25,26,[30][31][32]34,35) . Changes in the impedance signal can be correlated to the performance of the material, and data analysis can provide an explanation of the processes taking place at the interface between the substratum material and the polymer.…”

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confidence: 99%

Sensitive Detection of Polyimides Degradation by Microorganisms Using Electrochemical Impedance Spectroscopy.

Liu

et al. 2002

Microb. Environ.

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The microbial degradation of electronic insulation polyimides was monitored and evaluated using electrochemical impedance spectroscopy (EIS). The microbial inoculum, comprising Aspergillus versicolor, Chaetomium species, Cladosporium cladosporioides, and Tricoderma viride, was isolated previously from deteriorated polyimides. After inoculation, fungal growth on the polyimides resulted in distinctive EIS spectra indicative of polymer insulation failure, which directly related to polymer integrity. Degradation appeared to progress in a number of steps and two distinctive stages in the decline of film resistance were detected in the EIS cells within 24 and 72 days after inoculation. The early stage of the decrease in resistance may be related to the ingress of water molecules and ionic species into the polymeric materials, while the second stage probably resulted from partial degradation of the polymers by fungal growth on the polymer film. The relationship between changes of impedance spectra and microbial degradation of the polymer was further supported by scanning electron microscopy (SEM) of fungi growing on the surface of the inoculated polyimides. Our data indicate that the EIS technique can be used to detect the early degradation of resistant polymers and that polyimides are susceptible to biodegradation by fungi.

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Electrochemical techniques for delamination studies

Cited by 74 publications

References 3 publications

Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

Study on the anodizing of AZ31 magnesium alloys in alkaline borate solutions

EIS study on pitting corrosion of 7150 aluminum alloy in sodium chloride and hydrochloric acid solution

Sensitive Detection of Polyimides Degradation by Microorganisms Using Electrochemical Impedance Spectroscopy.

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