The sorption characteristics of epoxy coatings electrodeposited on steel during exposure to different corrosive agents

Mišković‐Stanković, Vesna; Dražić, D.M.; Kačarević-Popović, Zorica

doi:10.1016/0010-938x(96)00042-x

Cited by 97 publications

(32 citation statements)

References 18 publications

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“…It can be seen that the pore resistance decreases and coating capacitance increases for the first few days, denoting the entry of electrolyte into the epoxy coating. 16,17 This is the first step of electrolyte penetration through an organic coating and it is related to water uptake, when molecules of pure water diffuse into the micropores of the polymer net according to Fick's law. 18 After that initial period, the values of pore resistance and coating capacitance reach a plateau and remain almost unchanged over a long time period, indicating the maintenance of good protective properties due to the existence of the passive oxide film (anodic, chromatophosphate and phosphate layer).…”

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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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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“…Since increase in C c is a consequence of water absorption, high values indicate poor barrier properties of the coatings to the transport of water, oxygen and electrolyte ions [45]. This is due to the electrolyte penetration through the film where molecules of pure water diffuse in the micropores of the polymer network according to Fick's laws [46][47][48].…”

Section: Electrochemical Impedance Spectroscopymentioning

confidence: 99%

Morphology, rheological and protective properties of epoxy/nano-glassflake systems

Ghaffari

Ehsani

Khonakdar

2014

Progress in Organic Coatings

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“…Musiani et al [18] demonstrated that, although resistivity profiles may be obtained using effective medium theory and linear combinations of conductivities/permittivities, the fitted water uptake values are not reliable because the real composition of the solution that penetrates the coating is unknown. [12,19] Nguyen et al [20] suggested that a dry epoxy-polyaminoamide waterborne paint coating on a 2024 aluminium alloy showed constant-phase-element behavior that could be modeled accurately with the power-law model. However, for the same coating immersed in either a 0.5 M or a 0.05 M NaCl solution, the Young impedance model provided a better fit to the impedance data.…”

Section: Introductionmentioning

confidence: 99%

Identification of Resistivity Distributions in Dielectric Layers by Measurement Model Analysis of Impedance Spectroscopy

Chen

Nguyen

Orazem

et al. 2016

Electrochimica Acta

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The Voigt measurement model, developed in the 1990s for identification of the error structure of impedance measurements, is shown here to have utility in identifying resistivity distributions that give rise to frequency dispersion. The analysis was validated by application to synthetic data derived from a constant-phase-element model, a power-law distribution of resistivity, and an exponential distribution corresponding to a Young impedance. The application to experimental data obtained from coated aluminum demonstrates its utility for interpretation of impedance measurements.

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The sorption characteristics of epoxy coatings electrodeposited on steel during exposure to different corrosive agents

Cited by 97 publications

References 18 publications

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

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

Morphology, rheological and protective properties of epoxy/nano-glassflake systems

Identification of Resistivity Distributions in Dielectric Layers by Measurement Model Analysis of Impedance Spectroscopy

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