Performance of Anticorrosive Coatings Containing Tripolyphosphates in Aggressive Environments

The objective of this research was to study the efficiency of calcium tripolyphosphate and zinc tripolyphosphate as anticorrosive pigments for paints in aggressive environments. Alkyd and epoxy paints, of the solvent-borne type, containing 30% by volume (v/v) of the pigment, were formulated. The pig...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2008-09, Vol.47 (18), p.7038-7047
Main Authors: Deyá, M, Di Sarli, A. R, del Amo, B, Romagnoli, R
Format: Article
Language:English
Subjects:
Applied sciences
Chemical engineering
Exact sciences and technology
General Research
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Summary:The objective of this research was to study the efficiency of calcium tripolyphosphate and zinc tripolyphosphate as anticorrosive pigments for paints in aggressive environments. Alkyd and epoxy paints, of the solvent-borne type, containing 30% by volume (v/v) of the pigment, were formulated. The pigment volume concentration/critical pigment volume concentration (PVC/CPVC) ratio was fixed at 0.8. In a second stage, water-borne paints containing 30% v/v of both tripolyphosphates and different PVC values (20 and 25%) were also formulated. Finally, standardized accelerated (salt spray and humidity chamber exposure) and electrochemical impedance spectroscopy (EIS) tests were used to assess the protective performance of the coatings. Analysis and interpretation of the experimental data show that both, calcium and zinc tripolyphosphates, inhibit corrosion of painted steel panels exposed to aggressive environments.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie071544d