INVESTIGADORES
ELSNER Cecilia Ines
artículos
Título:
Electrochemical evaluation of the oxygen permeability for anticorrosive coatings films
Autor/es:
C.I. ELSNER; R.A. ARMAS; A.R. DI SARLI
Revista:
Portugaleae Electrochimica Acta
Editorial:
Portuguese Electrochemical Society
Referencias:
Año: 1995 vol. 13 p. 5 - 18
ISSN:
1647-1571
Resumen:
The effect of both the type
and thickness of three anticorrosive paints used as primers (chloride rubber,
vinyl and alkys binders) on the oxygen transport were studied. The permeability
coefficient of oxygen was calculated measuring the evolution of DC current with
time for coated steel samples immersed in 3% NaCl solution with their oxygen
being varied by bubbling either oxygen, air or nitrogen.
Before, during and after the immersion period a visual inspection of the coated
system was also carried out. The results obtained make it possible to conclude
that: a) the polarization of the coated steel and the current flux measurements
provide useful quantitative information about the oxygen transport through each
coated metal/electrolyte system; b) it was verified that the measured current
is due to the oxygen reduction on the coated steel surface and its limiting
value is characteristic of the system tested; this value was determined by the
oxygen transport through the coating and c) the method used is simple and allowed the following
order for the tested paints, as a function of their protective efficiency:
chlorinated rubber > vinyl > alkyd.