Evaluation of the protection against corrosion of a thick polyurethane film by electrochemical noise

Mojica, J.; Garcia, Emma; Rodríguez, Francisco J.; Genescá, J.

doi:10.1016/s0300-9440(01)00177-1

Cited by 25 publications

(8 citation statements)

References 22 publications

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“…iron dissolution (2Fe → 2Fe ++ + 4e), oxygen reduction (2H 2 O + O 2 + 4e → 4OH − ) as well as the effect of this fluctuation on the electrochemical potential of system. Much work has been done on bare (uncoated) metal ENM [1][2][3][4][5] showing that Rn is a reliable measure of corrosion resistance and that EN data may be able to determine the type of corrosion [6][7][8]. However when it comes to metal coated with an organic coating, although the ease with which the above electrochemical reactions go on may well control the rate with a defective organic coating, what is more commonly found is that the rate of transport of ions (e.g.…”

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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“…There have been very limited studies to characterize the thick corrosion protective coatings [2], but many papers have been published testing the delamination process of thin defected conventional coatings [3,4]. Corrosive agents' receipt of the substrate through the defected coating is done through both migration and diffusion mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of high solid polyurethane coating in the presence of salt at high temperature

Rezaei

Sharif

Sarabi

et al. 2010

Materials & Corrosion

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Ions' presence and high temperature affect the performance and service life of all types of coatings including pipeline coatings. Pipeline coatings are relatively thick and their evaluations are very time consuming. In this study, experiments on the thick coating samples (roughly 250 and 400 mm) of high solid polyurethane (HSPU) have been conducted to evaluate the effect of high temperature and presence of ions in the media, on the performance of coatings. The experiments were performed in two types of electrolytes, sodium chloride solution (3.5 wt% fraction) and distilled water, at two temperature levels of 25 and 75 8C, respectively. The coating performance was studied using electrochemical spectroscopy impedance (EIS) method. The results of experiments show that the presence of ions reduces the service life of the coating and higher temperature accelerates the degradation process further if oxygen is not limited.

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“…He indicated that specimens with large exposed area are required to study thick coatings. Mojica et al 15 studied the performance of thick polyurethane coating using electrochemical noise (EN). They showed that the polyurethane coating performed as a barrier, and the corrosion process on the substrate was controlled by the presence of pores in the barrier layer.…”

Section: Introductionmentioning

confidence: 99%

Evaluating water transport through high solid polyurethane coating using the EIS method

et al. 2009

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Buried pipelines are commonly coated with high solid polyurethane to prevent corrosion. The diffusion of water through the coating plays an essential role in the performance and endurance of the coating. This study focuses on the evaluation of water diffusion through polyurethane coatings. The effects of thickness and ambient temperature on water diffusion through polyurethane, which is coated on mild steel and immersed in 3.5% (weight fraction) NaCl solution, are evaluated using electrochemical impedance spectroscopy (EIS). Experimental observations clearly indicate that the water diffusion coefficient strongly depends on service temperature and the thickness of coating. Higher temperature (lower than T g ) increases water uptake of the polymer but no measurable changes were observed for the temperature change studied. EIS results show that the mechanism of corrosion does not change in the range of thicknesses and temperature investigated in this study.

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Evaluation of the protection against corrosion of a thick polyurethane film by electrochemical noise

Cited by 25 publications

References 22 publications

Analysis of electrochemical noise measurement on an organically coated metal

Analysis of electrochemical noise measurement on an organically coated metal

Experimental evaluation of high solid polyurethane coating in the presence of salt at high temperature

Evaluating water transport through high solid polyurethane coating using the EIS method

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