The mechanism of the anticorrosive action of calcium-exchanged silica
The objectives of this work were to study the efficiency and the mechanism of the anticorrosive action of calcium-exchanged silica in paints. The anticorrosive properties of the pigment were evaluated by following the electrochemical behaviour of a steel electrode in the pigment suspension and analy...
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| Formato: | Articulo |
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2003
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/171187 |
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I19-R120-10915-1711872024-10-08T04:11:18Z http://sedici.unlp.edu.ar/handle/10915/171187 The mechanism of the anticorrosive action of calcium-exchanged silica Le mécanisme de l’action anticorrosive de la silice qui a été l’objet d’une échange par le calcium Der Mechanismus der antikorrosiven Wirkung von Kalzium-ersetzten Silikaten Romagnoli, Roberto Deyá, Marta Cecilia Del Amo, Delia Beatriz 2003 2024-10-07T17:50:40Z en Ingeniería Química anticorrosive action calcium exchange silica The objectives of this work were to study the efficiency and the mechanism of the anticorrosive action of calcium-exchanged silica in paints. The anticorrosive properties of the pigment were evaluated by following the electrochemical behaviour of a steel electrode in the pigment suspension and analysing the protective layer formed on it. In a second stage, solvent-borne paints were formulated with 30% by volume (v/v) of the total pigment content. The selected PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio was 0.8. Two resins were chosen as film-forming materials: an alkyd and an epoxy. The performance of the resulting anticorrosive paints was assessed by accelerated (salt-spray and humidity chambers) and electrochemical tests (corrosion potential, ionic and polarisation resistance). It was demonstrated that the anticorrosive performance of paints pigmented with calcium/silica is at least equal or better than that obtained with paints containing zinc phosphate. Good correlation was obtained between accelerated and electrochemical tests. Steel passivation by calcium-exchanged silica is a complex process accomplished by the high pH of the pigment suspension and the deposition of a siliceous film on the steel surface. 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 91-168 |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ingeniería Química anticorrosive action calcium exchange silica |
| spellingShingle |
Ingeniería Química anticorrosive action calcium exchange silica Romagnoli, Roberto Deyá, Marta Cecilia Del Amo, Delia Beatriz The mechanism of the anticorrosive action of calcium-exchanged silica |
| topic_facet |
Ingeniería Química anticorrosive action calcium exchange silica |
| description |
The objectives of this work were to study the efficiency and the mechanism of the anticorrosive action of calcium-exchanged silica in paints. The anticorrosive properties of the pigment were evaluated by following the electrochemical behaviour of a steel electrode in the pigment suspension and analysing the protective layer formed on it. In a second stage, solvent-borne paints were formulated with 30% by volume (v/v) of the total pigment content. The selected PVC/CPVC (pigment volume concentration/critical pigment volume concentration) ratio was 0.8. Two resins were chosen as film-forming materials: an alkyd and an epoxy. The performance of the resulting anticorrosive paints was assessed by accelerated (salt-spray and humidity chambers) and electrochemical tests (corrosion potential, ionic and polarisation resistance).
It was demonstrated that the anticorrosive performance of paints pigmented with calcium/silica is at least equal or better than that obtained with paints containing zinc phosphate. Good correlation was obtained between accelerated and electrochemical tests.
Steel passivation by calcium-exchanged silica is a complex process accomplished by the high pH of the pigment suspension and the deposition of a siliceous film on the steel surface. |
| format |
Articulo Articulo |
| author |
Romagnoli, Roberto Deyá, Marta Cecilia Del Amo, Delia Beatriz |
| author_facet |
Romagnoli, Roberto Deyá, Marta Cecilia Del Amo, Delia Beatriz |
| author_sort |
Romagnoli, Roberto |
| title |
The mechanism of the anticorrosive action of calcium-exchanged silica |
| title_short |
The mechanism of the anticorrosive action of calcium-exchanged silica |
| title_full |
The mechanism of the anticorrosive action of calcium-exchanged silica |
| title_fullStr |
The mechanism of the anticorrosive action of calcium-exchanged silica |
| title_full_unstemmed |
The mechanism of the anticorrosive action of calcium-exchanged silica |
| title_sort |
mechanism of the anticorrosive action of calcium-exchanged silica |
| publishDate |
2003 |
| url |
http://sedici.unlp.edu.ar/handle/10915/171187 |
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