Ion transport through protective polymeric coatings exposed to an aqueous phase

Leidheiser, Henry; Granata, Richard D.

doi:10.1147/rd.325.0582

Cited by 52 publications

(21 citation statements)

References 9 publications

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“…125 The linear evolution of delaminated area with time, which is in agreement with a delamination process under Fickian diffusion control, identified by several researchers, suggests that delamination is controlled by diffusion of cations aligning the coating-steel interface. 305,312,313 The dependency of the rate of delamination on the hydrated size of the cations supports this hypothesis. However, referring to a negligible change in delamination rate of cation diffusion in a more stable silane-modified epoxy coating, it has been argued that interfacial transport alone can not determine the rate of cathodic delamination.…”

Section: Cathodic Delaminationmentioning

confidence: 54%

Anticorrosive coatings: a review

et al. 2009

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Section: Cathodic Delaminationmentioning

confidence: 54%

Anticorrosive coatings: a review

et al. 2009

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“…However, transport perpendicular to the coating has also been suggested as the rate determining step [26]. Other studies show that cations might be transported through the coating when the coated steel is under cathodic polarisation [28][29][30]. This paper investigates the mechanism of cathodic delamination of a simple commercial titanium dioxide (TiO 2 ) pigmented epoxy coating on abrasive blasted cold rolled steel.…”

Section: Introductionmentioning

confidence: 99%

Influence of substrate topography on cathodic delamination of anticorrosive coatings

Sörensen

Kiil

Dam‐Johansen

et al. 2009

Progress in Organic Coatings

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The cathodic delamination of a commercial TiO 2 pigmented epoxy coating on abrasive cleaned cold rolled steel has been investigated. The rate of delamination was found to depend on interfacial transport from the artificial defect to the delamination front and thereby the substrate topography, whereas the coating thickness had little influence. The presence of a significant potential gradient between the anode and the cathode and the dependency of the delamination rate on the tortuosity of the steel surface suggests that cathodic delamination is controlled by migration of cations from the defect to the delamination front. This means that abrasive blasting, to some extent, can be applied to control and minimize the observed rate of cathodic delamination. The lifetime of the species causing disbondment suggested that sodium hydroxide or potassium hydroxide and not peroxide species or radicals are the causative agents at free corrosion potential (i.e. without impressed current).

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“…As the studies of Leidheiser and Granata [33] prove, the impedance spectra of some coatings is specially sensitive to temperature, but in contrast, some high-impedance coatings exhibit little change in the impedance when exposed to the distilled water over a temperature range of 25-80 8C. Su et al [34] using EIS monitoring and embedded sensor showed that the resistance of both coating and coating/metal interface decrease with temperature, and the corrosion processes increase due to the loss of coating barrier properties.…”

Section: Salt Spray Testmentioning

confidence: 94%

“…However, the diffusion process and corrosion at the substrate can be intensified by ions. As Leidheiser and Granata [33] states, the corrosion processes depend on the charge transfer which is influenced by the ion permeation in polymeric coating. The considerable impact of ion presence on the impedance of coatings, which is dependent on the type of the electrolyte, is obvious in the above figures.…”

Section: Evaluation Of the Effect Of Ions On The Coating Performance mentioning

confidence: 97%

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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Ion transport through protective polymeric coatings exposed to an aqueous phase

Cited by 52 publications

References 9 publications

Anticorrosive coatings: a review

Anticorrosive coatings: a review

Influence of substrate topography on cathodic delamination of anticorrosive coatings

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

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