Publication: Recubrimientos anticorrosivos inteligentes y medioambientales aceptables basados en nanopartículas de sílice
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2019-06-18
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Universidad Complutense de Madrid
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Abstract
Los recubrimientos anticorrosivos de pintura, normalmente, contienen pigmentos que liberan constantemente sustancias que inhiben el proceso de corrosión. Durante las últimas décadas, los compuestos hexavalentes de cromo han sido los pigmentos anticorrosivos más utilizados en los sistemas de protección contra la corrosión para superficies metálicas, debido a su excelente relación eficacia/coste y a su excelente compatibilidad con la mayoría de las matrices orgánicas.Sin embargo, estos compuestos de cromo son altamente tóxicos, por lo que su uso implica un alto riesgo para la salud de los trabajadores y el medioambiente, lo que ha dado lugar a severas restricciones en su uso. Por otra parte, la lixiviación constante del inhibidor de corrosión,directamente incorporado a la matriz orgánica, reduce el tiempo de vida de protección del revestimiento. Por estas razones, hoy en día existe un interés especial para el desarrollo de nuevos sistemas anticorrosivos inteligentes que, además de mejorar la eficacia y eficiencia del mecanismo de protección, aumenten la vida útil de los recubrimientos, y al mismo tiempo,supongan alternativas medioambientalmente aceptables a los convencionales compuestos hexavalentes de cromo...
The coatings used for corrosion protection typically contain pigments which constantly release substances that inhibit the corrosion process. In recent decades, the hexavalent chromium compounds have been the main anticorrosive pigments used in protective corrosion systems for metal surfaces, due to their excellent effectiveness/cost and excellent compatibility with most organic matrices. However, it is well known that these chromium compounds are highly toxic and carcinogenic, so their use implies a high risk to both, the health of workers and the environment, which has led to severe restrictions in their use. Further, the constant leaching process of the corrosion inhibitor, directly incorporated into the organic matrix, reduces the coating service life. Therefore, there is a special interest for the development of new smart anticorrosive systems that are not only as effective and efficient as chromate-based systems but also environmentally friendly...
The coatings used for corrosion protection typically contain pigments which constantly release substances that inhibit the corrosion process. In recent decades, the hexavalent chromium compounds have been the main anticorrosive pigments used in protective corrosion systems for metal surfaces, due to their excellent effectiveness/cost and excellent compatibility with most organic matrices. However, it is well known that these chromium compounds are highly toxic and carcinogenic, so their use implies a high risk to both, the health of workers and the environment, which has led to severe restrictions in their use. Further, the constant leaching process of the corrosion inhibitor, directly incorporated into the organic matrix, reduces the coating service life. Therefore, there is a special interest for the development of new smart anticorrosive systems that are not only as effective and efficient as chromate-based systems but also environmentally friendly...
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Tesis de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Ingeniería Química y de Materiales, leída el 13-11-2018