Role of NOx in materials corrosion and degradation
Nitrogen oxides are classified as Greenhouse gases. Given the complex nature of atmospheric processes, their influence on materials is still unclear. An increase in nitrogen oxides concentration is predicted by the Intergovernmental Panel on Climatic change (IPCC) for the present Century. The decrea...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Institución: | Universidad Autónoma de Campeche |
| Repositorio: | Redalyc-UAC |
| OAI Identifier: | oai:redalyc.org:181620500032 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=181620500032 |
| Access Level: | acceso abierto |
| Palabra clave: | Química NOx corrosion Chlorides materials degradation |
| Sumario: | Nitrogen oxides are classified as Greenhouse gases. Given the complex nature of atmospheric processes, their influence on materials is still unclear. An increase in nitrogen oxides concentration is predicted by the Intergovernmental Panel on Climatic change (IPCC) for the present Century. The decreasing sulphur dioxide levels in most parts of the world and the increase in levels of nitrogen oxides has created a new multipollutant situation where interaction of pollutant is very important. Under laboratory conditions, the influence of NOx on corrosion and degradation of materials is very low; however, in atmospheres containing SO2 an increase of corrosion and degradation is reported when NO2 is present. Nitrogen containing corrosion or degradation products are rarely reported. In general, the role of NO2 (the nitrogen oxide more abundant in troposphere) is to catalyze corrosion and degradation reactions. In addition to common pollutants of anthropogenic origin, the presence of Chloride ions is another important factor to take into account. This situation, in general, has not been studied. It is very well known that Chloride ions significantly increase corrosion and degradation of materials. Very few reports about the influence of NO2 in presence of airborne salinityon materials corrosion and degradation have been found. Based on literature information, considerations about corrosion and degradation behavior of metals and porous materials in the new multipollutant situation, taking into account the role of NO2 in presence of other pollutants are made. The interaction of NO2 and Chlorides is also considered. |
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