RT info:eu-repo/semantics/article
T1 Characterization of water uptake by organic coatings used for the corrosion protection of steel as determined from capacitance measurements
A1 Souto, Ricardo Manuel
A1 Moreno, C.
A1 Hernández, S.
A1 Santana, Juan José
A1 González-Guzmán, Jorge
A1 González, Sergio
A2 Química
A2 Grupo de Electroquímica y Corrosión
Departamento de Química
Instituto de Materiales y Nanotecnología
K1 organic coatings
K1 corrosion protection
K1 water uptake
K1 EIS
K1 diffusion coefficients
AB Water absorption by a coating on a metal is a major factor affecting its corrosion protection efficiency. It is usually determined from the increase of coating capacity with time, which is taken as a measure of the water volume ratio in the system. In this communication, the early stages of water uptake by three paint systems applied on galvanized steel have been investigated. The models proposed by Brasher and Kingsbury (BK), and the discrete (DM) and the continuous (CM) models proposed by Bellucci and Nicodemo, were employed to evaluate water absorption. It has been found that the amount of water adsorbed in the coating depended on both the nature and the thickness of the film, though different results were delivered by these methods, with convergence occurring only in the saturation stage. Next, water diffusion coefficients were determined, and they were observed to vary with the thickness of the polymer film regardless their actual composition. The time evolution of the diffusion coefficients could be adequately described using the DM model.
YR 2012
FD 2012
LK http://riull.ull.es/xmlui/handle/915/19025
UL http://riull.ull.es/xmlui/handle/915/19025
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 26-sep-2024