INVESTIGADORES
DEYA Marta Cecilia
artículos
Título:
The assessment of a smart anticorrosive coating by the electrochemical noise
Autor/es:
C. DEYÁ; B. DEL AMO; E. SPINELLI; R. ROMAGNOLI
Revista:
PROGRESS IN ORGANIC COATINGS
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 76 p. 525 - 532
ISSN:
0300-9440
Resumen:
Zinc phosphate and related compounds are convenient replacements for chromates. However, more
eco-compatible pigments are being investigated. The objective of this research was to develop a modified
zeolitic rock which is intended to replace phosphate pigments in anticorrosive paints. The modified
zeolitic rock was obtained by grinding the rock followed with ionic exchange with molybdenyl ions. This
?composite? has an intelligent behavior because molybdenum compounds are leached from the zeolite
particle by corrodent species. The anticorrosive properties of this zeolitic rock were studied by electrochemical
techniques, employing inhibitor suspensions, and formulating anticorrosive coatings. Coatings
performance was evaluated by accelerated tests (humidity chamber and salt spray) and electrochemical
noise measurements (ENM). Electrochemical noise data were analyzed in the time domain. The noise
resistance (Rn) was compared, as far as possible, with the polarization resistance.
It was demonstrated that zinc phosphate content could be reduced to one-third with respect to the
recommended value in the literature. The electrochemical noise technique allowed to differentiate the
anticorrosive performance of the different coatings formulated in this research.
It was demonstrated that zinc phosphate content could be reduced to one-third with respect to the
recommended value in the literature. The electrochemical noise technique allowed to differentiate the
anticorrosive performance of the different coatings formulated in this research.
Rn) was compared, as far as possible, with the polarization resistance.
It was demonstrated that zinc phosphate content could be reduced to one-third with respect to the
recommended value in the literature. The electrochemical noise technique allowed to differentiate the
anticorrosive performance of the different coatings formulated in this research.