High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate

Zinc molybdenum phosphate belongs to the so called second generation phosphate pigments and is claimed to have equal or greater anticorrosive properties than chromates and better than zinc phosphate alone. Little Information is available in the literature about its anticorrosive performance. The aim...

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Autores principales: Romagnoli, Roberto, Del Amo, Delia Beatriz, Vetere, Vicente Francisco, Véleva, L.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2000
Materias:
Química
Epoxy paints
zinc
Binder
Pigments
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/168741
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-168741
record_format dspace
spelling I19-R120-10915-1687412024-08-21T04:09:14Z http://sedici.unlp.edu.ar/handle/10915/168741 High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate Pinturas epoxidicas anticorrosivas de alta eficiencia pigmentadas con fosfato de cinc modificado con molibdato de cinc Romagnoli, Roberto Del Amo, Delia Beatriz Vetere, Vicente Francisco Véleva, L. 2000 2024-08-20T17:12:56Z en Química Epoxy paints zinc Binder Pigments Zinc molybdenum phosphate belongs to the so called second generation phosphate pigments and is claimed to have equal or greater anticorrosive properties than chromates and better than zinc phosphate alone. Little Information is available in the literature about its anticorrosive performance. The aim of this research was to study the anticorrosive performance of zinc molybdenum phosphate in solvent borne epoxy paints employing two anticorrosive pigment loadings. The effect of incorporating zinc oxide as complemetary pigment was also studied. SAE 1010 Steel panels were primed and coated with three different paint systems containing the anticorrosive paint and this paint plus a sealer cmd/or a topcoat. The anticorrosive efftciency of the different paint systems was assessed by accelerated tests (salt spray, humidity and accelerated weathering). Electrochemical measurements were done employing the anticorrosive paints alone. Results showed that the highest anticorrosive effect was obtained employing 30% of zinc molybdenum phosphate. Polarization measurements showed that the anodic film formed on Steel blocked the active sites for oxygen reduction. The incorporation of zinc oxide to pigment formula was detrimental due to its high water absorption and to the fact that it reduced zinc molybdenum phosphate solubility by the common ion effect. Polarization curves of pigments mixtures could be used as a guideline to predict the anticorrosive coating performance in accelerated and electrochemical tests. However, the final decisión on pigment selection must be taken on the basis of accelerated trials. Centro de Investigación y Desarrollo en Tecnología de Pinturas Articulo Articulo http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 27-31
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
Epoxy paints
zinc
Binder
Pigments
spellingShingle Química
Epoxy paints
zinc
Binder
Pigments
Romagnoli, Roberto
Del Amo, Delia Beatriz
Vetere, Vicente Francisco
Véleva, L.
High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
topic_facet Química
Epoxy paints
zinc
Binder
Pigments
description Zinc molybdenum phosphate belongs to the so called second generation phosphate pigments and is claimed to have equal or greater anticorrosive properties than chromates and better than zinc phosphate alone. Little Information is available in the literature about its anticorrosive performance. The aim of this research was to study the anticorrosive performance of zinc molybdenum phosphate in solvent borne epoxy paints employing two anticorrosive pigment loadings. The effect of incorporating zinc oxide as complemetary pigment was also studied. SAE 1010 Steel panels were primed and coated with three different paint systems containing the anticorrosive paint and this paint plus a sealer cmd/or a topcoat. The anticorrosive efftciency of the different paint systems was assessed by accelerated tests (salt spray, humidity and accelerated weathering). Electrochemical measurements were done employing the anticorrosive paints alone. Results showed that the highest anticorrosive effect was obtained employing 30% of zinc molybdenum phosphate. Polarization measurements showed that the anodic film formed on Steel blocked the active sites for oxygen reduction. The incorporation of zinc oxide to pigment formula was detrimental due to its high water absorption and to the fact that it reduced zinc molybdenum phosphate solubility by the common ion effect. Polarization curves of pigments mixtures could be used as a guideline to predict the anticorrosive coating performance in accelerated and electrochemical tests. However, the final decisión on pigment selection must be taken on the basis of accelerated trials.
format Articulo
Articulo
author Romagnoli, Roberto
Del Amo, Delia Beatriz
Vetere, Vicente Francisco
Véleva, L.
author_facet Romagnoli, Roberto
Del Amo, Delia Beatriz
Vetere, Vicente Francisco
Véleva, L.
author_sort Romagnoli, Roberto
title High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
title_short High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
title_full High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
title_fullStr High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
title_full_unstemmed High performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
title_sort high performance anticorrosive epoxy paints pigmented with zinc molybdenum phosphate
publishDate 2000
url http://sedici.unlp.edu.ar/handle/10915/168741
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