Monitoring the degradation of a high solids epoxy coating by means of EIS and EN

Sánchez-Amaya, J.M.; Osuna, R.; Bethencourt, M.; Botana, Francisco

doi:10.1016/j.porgcoat.2007.07.020

Cited by 51 publications

(30 citation statements)

References 18 publications

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“…ENM may be implemented in order to acquire information about coating integrity and degradation mechanism in coated systems. The degradation process of a paint coating may be analysed by contributions from charge transfer reactions at high frequencies and mass transport reactions at low frequencies [9].…”

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

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“…Guidelines for the calibration of noise measuring device, including the use of a dummy cell with a known level of noise together with a sine wave signal generator is given in references [15,48]. It should be noted that the level of current noise generated by coated metals with very high resistance coatings is often very low and could be in the order of 10 -11 to 10 -13 A.cm 2 [33,49,50]. Therefore it is essential to check the measurement limits of the ZRA to ensure it has sufficient sensitivity for such measurements.…”

Section: Noise Measurement Method: Acquisition Parametersmentioning

confidence: 99%

“…Spectral noise resistance at 0.1 Hz (Rsn(0.1Hz)) was calculated by Sanchez-Amaya et al [49] from noise data collected at 2. [96].…”

Section: Mechanistic Informationmentioning

confidence: 99%

A critical review of electrochemical noise measurement as a tool for evaluation of organic coatings

Jamali

Mills

2016

Progress in Organic Coatings

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The simplicity of measuring equipment and versatility of data analysis makes electrochemical noise measurement an ideal technique for acquiring electrochemical information about the corrosion behavior of a painted metal relatively quickly. Hence the method has great potential for use in the laboratory as well as in field situations. However, special care must be taken in choosing data acquisition parameters, reference electrodes and symmetry of electrodes in order to achieve reproducible measurements. These areas have been discussed in this review along with methods of data analysis, alternative electrode configurations for on-site measurements and novel applications of the technique. AbstractThe simplicity of measuring equipment and versatility of data analysis makes electrochemical

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“…An alternative parameter, Z 0.1 Hz, is used to evaluate the protective property of organic coatings [49,50]. The parameter is defined as the impedance modulus of the metal-coating system at frequency 0.1 Hz.…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%