Embedded electrode electrochemical noise monitoring of the corrosion beneath organic coatings induced by ac–dc–ac conditions

Su, Quan; Allahar, Kerry N.; Bierwagen, Gordon P.

doi:10.1016/j.electacta.2007.10.063

Cited by 36 publications

(22 citation statements)

References 23 publications

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“…Provided that the individual events are independent of other events like the stochastic processes, it has been known that the shot noise analysis is applicable to the individual events. In the recent literature, the shot noise theory has been applied to the analysis of electrochemical noise signals [41][42][43][44][45]. If we assume that shot noise is produced during breakdown of the passive film, pit initiation, and hydrogen evolution, the average corrosion current I corr is defined as…”

Section: Theoretical Background 31 Shot Noise Theorymentioning

confidence: 99%

Corrosion behavior of Mg‐10Gd‐2Y‐0.4Zr alloy under thin electrolyte layers

Chen

Zhang

Meng

et al. 2010

Materials & Corrosion

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The corrosion behavior of Mg-10Gd-2Y-0.4Zr (GW102K) alloy under thin electrolyte layer (TEL) with various thicknesses was investigated by means of cathodic polarization curve, electrochemical impedance spectroscopy (EIS), and electrochemical noise (EN). Based on shot noise theory and stochastic theory, the EN results were quantitatively analyzed by using the Weibull and Gumbel distribution function, respectively. The experimental results showed that the anodic and cathodic processes of the corrosion of GW102K alloy were both retained under thin electrolyte layers. Whether under TEL or not, the cathodic process was dominated by hydrogen evolution reaction. The corrosion was more localized under thin electrolyte layer than that in bulk solution. The results also demonstrated that there were two kinds of effects for thin electrolyte layer on the corrosion behavior of GW102K alloy: (i) the rate of pit initiation was evidently retarded compared to that in bulk solution; (ii) the probability of pit growth decreased, which should be the real reason why the corrosion rate of GW102K alloy decreased with the decrease in layer thickness.

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Section: Theoretical Background 31 Shot Noise Theorymentioning

confidence: 99%

Corrosion behavior of Mg‐10Gd‐2Y‐0.4Zr alloy under thin electrolyte layers

Chen

Zhang

Meng

et al. 2010

Materials & Corrosion

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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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“…We recently began to extend our work on embedded sensors to single frequency EIS methods and have been increasing the types of applications that we have examined by this type of measurement. [76][77][78][79] This work continues to show the value of concentrating one's attention on the changes occurring in the protective-organic coating in exposure, and determining how these changes together with applicable models of coating behavior enable lifetime prediction of the coating protection. In this way, one can begin to provide the capability of pre-emptive maintenance for object appearance, safety, and sustainability.…”

Section: Embedded Sensors In Coatings For Corrosion Control Assessmentmentioning

confidence: 98%

The physical chemistry of organic coatings revisited—viewing coatings as a materials scientist

Bierwagen

2008

J Coat Technol Res

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Modern organic coatings are complex materials which must be observed and interpreted from the viewpoint of what has become known as Materials Science. Paints, as most of us first learned to name organic coatings, were originally designed and conceived as art forms. Visual artists developed their own applied colorants; part of an artist's success depended on these skills (consider Leonardo da Vinci). Today, one's skills as a materials scientist are perhaps the most crucial attributes of the true coatings scientist. Considering pigmented organic coating as random heterogeneous composite materials was the key to my research group's contributions in improving the understanding of pigment volume concentrations (PVC) and critical PVC effects in coatings. Seeking to develop and improve electrochemical materials characterization techniques for measuring and predicting the corrosion protective properties of coatings has driven our research at North Dakota State University (NDSU) in this area. Analyzing the performance of protective coatings for exterior bronze statues and viewing these coatings from the materials requirements of the art conservator has directed our activities in conservation science. The use of the methods of modern electrochemical materials science has been the key to our development of Mg-rich primers for entirely Cr-free corrosion protection of aircraft alloys. Our work on developing methods to perform material measurements directly on coatings during their field use has directed our recent studies of embedded sensors in coatings. Our work in these areas will be reviewed and current results presented. Forecasts of future developments in these and other areas of coatings science will be presented, extrapolating from present developments in materials science. Incorporating materials concerns, especially the methods and concepts of nanomaterials science, into coatings science will be of paramount importance to future research and development in coatings.

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Embedded electrode electrochemical noise monitoring of the corrosion beneath organic coatings induced by ac–dc–ac conditions

Cited by 36 publications

References 23 publications

Corrosion behavior of Mg‐10Gd‐2Y‐0.4Zr alloy under thin electrolyte layers

Corrosion behavior of Mg‐10Gd‐2Y‐0.4Zr alloy under thin electrolyte layers

Analysis of electrochemical noise measurement on an organically coated metal

The physical chemistry of organic coatings revisited—viewing coatings as a materials scientist

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