In situ determination of the loss of adhesion of barrier epoxy coatings using electrochemical impedance spectroscopy

Westing, E.P.M. van; Ferrari, G.; Geenen, F.M.; Wit, J.H.W. de

doi:10.1016/0033-0655(93)80006-v

Cited by 67 publications

(27 citation statements)

References 8 publications

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“…Furthermore, distortions observed in those resistive-capacitive contributions indicate a deviation from the theoretical models in terms of a time constants distribution due to either lateral penetration of the electrolyte at the metal/ coating interface (usually started at the base of intrinsic or artificial coating defects), underlying metallic surface heterogeneity (topological, chemical composition, surface energy), and/or diffusional processes that could take place along the test. Since all these factors cause the impedance/frequency relationship to be non-linear, they are taken into consideration by replacing one or more capacitive components (C i ) of the equivalent circuit transfer function by the corresponding constant phase element (CPE), for which the impedance may be expressed as [44][45][46] :…”

Section: Long Immersion Times: As Seen Inmentioning

confidence: 99%

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

et al. 2009

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The effectiveness of Cr(VI)-based passivation treatments is well accepted but there are many problems with regard to their environmental suitability. Because these compounds are carcinogenic and toxic, eco-friendly systems capable of replacing them are being evaluated. In this work, the corrosion behavior in 0.5 M NaCl solution of zinc coatings deposited from a free-cyanide alkaline bath and treated with Cr 3+ based passivation coatings were characterized through DC and EIS techniques. The salt spray test as well as studies of the surface structure and chemical composition were also performed. From these analyses it was inferred that (1) the greencolored Cr 3+ passivated coatings provide better corrosion resistance than the yellow-and blue-colored coatings, and (2) together with an adequate painting system, they could be a less polluting and less toxic alternative to traditional chromate coatings.

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Section: Long Immersion Times: As Seen Inmentioning

confidence: 99%

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

et al. 2009

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“…Further studies [14][15][16] revealed that under-film corrosion initially occurs at D type areas and then spreads from the interface as initiated by cathodic disbonding. It has been also shown that the mechanism of ionic conduction and local inhomogeneity of the polymer film plays a major role in the failure mode of protective coatings [17][18][19][20][21]. One of the major causes of formation of D type areas is believed to be the presence of regions of low crosslinking density within the film [22].…”

Section: Introductionmentioning

confidence: 99%

A probabilistic model for estimation of ionically permeable inhomogeneities in polymer coatings

Jamali

Mokhtarian

Mills

2015

Progress in Organic Coatings

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The mechanism of ionic conduction through polymer coatings has been investigated. The presence of highly permeable areas in the coating (designated as D type areas), impose an electrochemical inhomogeneity which is identified by change in the ionic resistance as measured by DC method. The effect of coating thickness was studied on D type behaviour of coatings. A structural model is proposed to explain the changes in conduction mechanism by variation of coating thickness. Statistical models based on numerical (simulation-based) and analytical (

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“…78,79 Since all these factors cause the impedance/ frequency relationship to be non-linear, they are taken into consideration by replacing the capacitive components (C i ) of the equivalent circuit transfer function by the corresponding constant phase element Q i (CPE), thus obtaining a better fit of data. 61,63 The CPE is defined by the following equation 80 :…”

Section: Equivalent Circuitsmentioning

confidence: 99%

Improvement of anticorrosive performance of phosphate-based alkyd paints with suitable additives

et al. 2010

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The purpose of this investigation was focused on reducing the content of zinc phosphate in anticorrosive paints by means of the incorporation of low quantities of selected soluble corrosion inhibitors. The article describes the anticorrosive behavior of alkyd paints containing reduced levels of zinc phosphate, zinc oxide, and some soluble compounds used as additives (e.g., sodium polyphosphate, sodium phosphate, and sodium benzoate). Anticorrosive solventborne alkyd paints were formulated with a zinc phosphate content of 10% by volume (v/v) with respect to the total pigment concentration. In all cases, the PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio was 0.8. Experimental paints, applied on sandblasted SAE 1010 panels, were evaluated by accelerated tests (salt spray cabinet) and electrochemical measurements (electrochemical impedance spectroscopy, EIS). The results show that the additions of small amounts of soluble corrosion inhibitors to low content zinc phosphate paint formulations enhance their performance in a very remarkable way. Perhaps, the most outstanding feature is that the employment of soluble additives allowed the reduction of the zinc phosphate content with concomitant savings.

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In situ determination of the loss of adhesion of barrier epoxy coatings using electrochemical impedance spectroscopy

Cited by 67 publications

References 8 publications

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

Morphology and corrosion resistance of Cr(III)-based conversion treatments for electrogalvanized steel

A probabilistic model for estimation of ionically permeable inhomogeneities in polymer coatings

Improvement of anticorrosive performance of phosphate-based alkyd paints with suitable additives

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