The evaluation of anticorrosive automotive epoxy coatings by means of electrochemical impedance spectroscopy

Suay, J.; Rodriguez, Maria Teresa Raya; Razzaq, K. A.; Carpio, Jaime; Saura, J. J.

doi:10.1016/s0300-9440(02)00219-9

Cited by 50 publications

(17 citation statements)

References 15 publications

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“…In this case, a proper surface pretreatment is expected to permanently change the oxide surface chemistry as well as morphology and/or roughness. A change of surface chemistry is expected to adjust the surface electronic and semiconductor properties as a result of variation of doping concentration type and/or density as well as charge carriers [15][16][17]. In this study, model pretreatments are defined to thoroughly control surface properties.…”

Section: Surface Oxide Propertiesmentioning

confidence: 99%

Studying interfacial bonding at buried polymer–zinc interfaces

Taheri

Terryn

Mol

2015

Progress in Organic Coatings

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Section: Surface Oxide Propertiesmentioning

confidence: 99%

Studying interfacial bonding at buried polymer–zinc interfaces

Taheri

Terryn

Mol

2015

Progress in Organic Coatings

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“…The C dl is a measure of an area from which the coatings have been disbanded and can be measured only at a very advanced stage of deterioration. The change in C dl values may depend either on disbanding of the coating or on the accumulation of corrosion products during the corrosion processes [47].…”

Section: Break Point Frequencymentioning

confidence: 99%

Chemical Degradation of Epoxy-Polyamide Primer by Electrochemical Impedance Spectroscopy

2012

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The degradation of organic-inorganic hybrid materials based on epoxy resin was characterized electrochemically in aggressive chemical electrolyte. In the present study, the hybrid material as primer was prepared from epoxy resin pigmented by zinc phosphate cured with polyamide (EPZ). The hybrid material was coated on mild steel substrate, and the corrosion behavior was studied by electrode-potential time measurements and mainly by electrochemical impedance spectroscopy (EIS) in 5% NaCl solution. The impedance parameters, namely, coating capacitance (C c ), pore resistance (R po ), charge transfer resistance (R t ), double layer capacitance (C d1 ), and break point frequency ( f b ), corresponding to 45• phase angle as a function of time of exposure were estimated. The observed impedance behavior were compared with the established equivalent electrical circuit represents the coated metal/electrolyte interface. Changes in the values of the circuit components given the information on the stages of degradation and physical phenomenon occurring throughout the degradation of primer coating were also been predicted. In addition, information related to the porous nature of the primer, limited passivation effect, and delamination of coating with longer exposure that resulted in the diffusion controlled corrosion of metal are also recognized. Thus, results indicate that the EPZ coating had good corrosion resistance. This could be a nonpolluting alternative to the traditional chromate like environmentally harmful coatings.

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“…EIS is a well-established technique for studying anticorrosion performance of organic coatings [21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Not only does it provide a direct and sensitive method for detecting corrosion reactions on coated metal substrates but it also provides information about properties of the protective coating such as dielectric properties, the extent of ion diffusion and porosity of the film [23,35].…”

Section: Introductionmentioning

confidence: 99%