Corrosion protection of aluminium by a cataphoretic epoxy coating

Corrosion protection of aluminium by a cataphoretic epoxy coating

The corrosion behavior and thermal stability of epoxy coating electrodeposited on aluminium have been investigated during exposure to 3% NaCl. Electrochemical impedance spectroscopy (EIS), gravimetric liquid sorption experiments, thermogravimetric analysis (TGA) and polarization measurements were us...

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Bibliographic Details
Published in:Progress in organic coatings Vol. 36; no. 1; pp. 53 - 63
Main Authors: Mišković-Stanković, V.B., Stanić, M.R., Dražić, D.M.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 1999
Elsevier Sequoia
Subjects:
Aluminium
Applied sciences
Coatings. Paints, varnishes and inks
Corrosion
Corrosion prevention
EIS
Electrodeposition
Epoxy coatings
Exact sciences and technology
Film formation and curing, properties, testing
Metals. Metallurgy
Polymer industry, paints, wood
Epoxy coatings
Electrodeposition
Aluminium
Corrosion
EIS
Thermal properties
Electrochemical properties
Coating material
Anticorrosive paint
Epoxy resin
Cataphoresis
Paint film
Experimental study
Corrosion protection
Thermal stability
Mass transfer
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Summary:The corrosion behavior and thermal stability of epoxy coating electrodeposited on aluminium have been investigated during exposure to 3% NaCl. Electrochemical impedance spectroscopy (EIS), gravimetric liquid sorption experiments, thermogravimetric analysis (TGA) and polarization measurements were used. From the results obtained from EIS (pore resistance, coating capacitance, relative permittivity of coating, charge-transfer resistance, double-layer capacitance), gravimetric liquid sorption experiments (diffusion coefficient, energy of activation of water diffusion) and TGA (water content inside the coating and thermal stability), it can be concluded that the electrochemical, transport and thermal properties of an epoxy coating on aluminium are significantly improved with respect to the same epoxy coating on other substrates (steel, phosphatized steel, steel modified by Zn–Ni alloy). The better protective properties can be explained by less porous structure of the coating on aluminium, caused by lower rate of H 2 evolution, while the prolonged corrosion protection is due to the passive, mainly barrier film of Al 2O 3 on its surface.
ISSN:0300-9440
1873-331X
DOI:10.1016/S0300-9440(99)00024-7