The Electrical Properties of Protective Polymer Coatings as Related to Corrosion of the Substrate

Kendig, M.; Leidheiser, Henry

doi:10.1149/1.2133017

Cited by 112 publications

(52 citation statements)

References 10 publications

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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].…”

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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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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“…Other studies [22,23] have found that 1% lactic acid on chromium-passivated tin plates and protected by organic compounds can be attacked by corrosion currents due to the presence of pores We must notice the appearance of new bands related to the yellow spots in Figure 1 and with the spectra observed in Sample 2; these bands are mainly those seen at 960 cm´1, 1260 cm´1, 1300 cm´1, 1440 cm´1 and 1657 cm´1. These resonance waves are not attributed to vibration modes in the PET coating or to the rutile load that gives the white color to the polymer.…”

Section: Discussionmentioning

confidence: 68%

“…Other studies [22,23] have found that 1% lactic acid on chromium-passivated tin plates and protected by organic compounds can be attacked by corrosion currents due to the presence of pores and interfacial defects that allow degradation and loss of functionality at pH 2-3. The postmortem salmon produces lactic acid and may be one of the sources of organic acid that may act on the container-food system.…”

Section: Discussionmentioning

confidence: 99%

Surface and Microstructural Failures of PET-Coated ECCS Plates by Salmon-Polymer Interaction

Zumelzu

Wehrhahn

Rull

et al. 2016

Metals

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Abstract:The new types of knowledge-intensive, multilayer containers consist of steel plates protected against corrosion by nanometric electrolytic chromium (Cr 0 ) and chromium oxide (Cr 2 O 3 ) layers chemically bonded to polyethylene terephthalate (PET) polymer coating to preserve food. It was observed that after emptying the cans, the salmon adhered to the polymer coating, changing its color, and that this adhesion increased with longer storage times. This work was aimed at determining the product-container interactions and their characterization by X-ray diffraction (XRD), confocal Raman and micro-Raman imaging and scanning electron microscopy (SEM) analysis. The zones of adhesion showed surface changes, variations in crystallinity and microstructural degradation of the PET coating. In addition, localized damages altering the functional properties of the multilayer system were observed as microcracking in the chromium layers that protect the steel. The degradation undergone was evaluated and characterized at a surface and microstructural level to establish the failure mechanisms, which were mainly associated with the activity of the adhered muscle and its biochemical components. Finally, a recommendation is done to preserve the useful life and functionality of cans for the preservation and efficient use of resources with an impact on recycling and environmental conservancy.

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“…This interpretation of behavior organic coatings on steel and aluminum alloys and effect of corrosion agent is found by numerous authors. [10][11][12][13][14] An equivalent electrical circuit model for the behavior of polymer-coated metal in corrosive environments has been used (Figure 1), where R Ω is the resistance of the electrolyte, R p is the coating pore resistance due to electrolyte penetration, C c is the coating capacitance, R ct is the charge-transfer resistance, Z w is the Warburg impedance. By fitting the experimental data, from the impedance plots in the complex plane, 15 the pore resistance, R p , coating capacitance, C c , charge-transfer resistance, R ct and double-layer capacitance, C d were determined and plotted as function of time in Figures 2, 3, 4 and 5, respectively.…”

Section: Resultsmentioning

confidence: 99%

The study of corrosion stability of organic epoxy protective coatings on aluminium and modified aluminium surfaces

Lazarević¹,

Mikovic-Stankovic²,

Kačarević-Popović³

et al. 2005

J. Braz. Chem. Soc.

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Revestimentos de epóxido foram obtidos através da eletrodeposição catódica de uma resina epóxi sobre alumínio e superfícies de alumínio modificadas (fosfatadas, cromadas-fosfatadas e anodizadas) usando o método potenciostático (concentração da resina de 10% em massa, temperatura de 27 °C e tensão de 250 V). A corrosão desses revestimentos foi investigada durante exposição ao NaCl 3% usando espectroscopia de impedância eletroquímica (EIS) e medidas de polarização. A partir da medida da dependência da resistência, da capacitância e da permissividade, obtida da EIS, e da velocidade da reação de desprendimento de hidrogênio no banho de eletrodeposição, obtida das curvas de polarização, pode-se observar que o revestimento epóxido sobre o alumínio e superfícies de alumínio modificadas constitui uma boa barreira ao transporte de agentes corrosivos. O tempo de contato entre o eletrólito e a superfície do alumínio sob o revestimento é muito maior no caso das superfícies modificadas por cromagem-fosfatização e anodização.Epoxy coatings were formed by cathodic electrodeposition of an epoxy resin on aluminium and modified aluminium surfaces (phosphatized, chromatized-phosphatized and anodized aluminium) using a constant voltage method (resin concentration 10 wt.%, temperature 27 °C, applied voltage 250 V). The corrosion behavior of these coatings was investigated during exposure to 3% NaCl using electrochemical impedance spectroscopy (EIS) and polarization measurements. From the dependence of resistance, capacitance and relative permittivity of the coating, obtained from EIS, on the rate of hydrogen evolution reaction in the electrodeposition bath, obtained from polarization curves, it can be observed that the epoxy coating on aluminium and modified aluminium surfaces is a good barrier against the transport of corrosive agents. The time corresponding to contact between electrolyte and aluminium surface under the coating is greater in the case of surface modification by chromato-phosphatized and anodized aluminium than in the case of phosphatize one.

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The Electrical Properties of Protective Polymer Coatings as Related to Corrosion of the Substrate

Cited by 112 publications

References 10 publications

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

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

Surface and Microstructural Failures of PET-Coated ECCS Plates by Salmon-Polymer Interaction

The study of corrosion stability of organic epoxy protective coatings on aluminium and modified aluminium surfaces

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