Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Atmospheric corrosion tests in Brazilian Legal Amazon - field and laboratory tests
This paper presents the first results concerning tests carried out to evaluate the atmospheric corrosion in Brazilian Legal Amazon, as part of the SIVAM - Amazon Surveillance System. The aim of the present work is to determine and select materials as well as anti-rust paints, which will be employed to protect metallic structures of radar towers, equipment and buildings. Five anti-rust paints on mild and galvanized steels were tested. Field tests are supported by accelerated laboratory results in wet and drying cycles in electrolytes simulating different microclimates. These solutions were prepared in laboratory based on pH, conductivity and chloride content values of locally collected rainwater. For example, sites like Cachimbo and Jacareacanga, which present dissimilar microclimates, have shown dissimilar behaviour for the same paint system. When samples are not scratched, the electrode potential measurements are meaningless. Nevertheless, once scratched, the surface of the paint leads immediatly to meaningful values of potentials, Those values could be an important method for monitoring and control the performance of the paint during the service life of the structures. One of the paint systems was pigmented with magnetite, previously considered as the main constituent of rusts. However, rust layers analyses did not confirm this assumption. In fact, X-ray diffraction showed, after 120 days of exposition, that this oxide is a minor component of the rust products. As results of these preliminary analyses, lepidocrocite (gamma-FeOOH) and goethite (alpha-FeOOH) were recognised as being the main corrosion products.
Atmospheric corrosion tests in Brazilian Legal Amazon - field and laboratory tests
This paper presents the first results concerning tests carried out to evaluate the atmospheric corrosion in Brazilian Legal Amazon, as part of the SIVAM - Amazon Surveillance System. The aim of the present work is to determine and select materials as well as anti-rust paints, which will be employed to protect metallic structures of radar towers, equipment and buildings. Five anti-rust paints on mild and galvanized steels were tested. Field tests are supported by accelerated laboratory results in wet and drying cycles in electrolytes simulating different microclimates. These solutions were prepared in laboratory based on pH, conductivity and chloride content values of locally collected rainwater. For example, sites like Cachimbo and Jacareacanga, which present dissimilar microclimates, have shown dissimilar behaviour for the same paint system. When samples are not scratched, the electrode potential measurements are meaningless. Nevertheless, once scratched, the surface of the paint leads immediatly to meaningful values of potentials, Those values could be an important method for monitoring and control the performance of the paint during the service life of the structures. One of the paint systems was pigmented with magnetite, previously considered as the main constituent of rusts. However, rust layers analyses did not confirm this assumption. In fact, X-ray diffraction showed, after 120 days of exposition, that this oxide is a minor component of the rust products. As results of these preliminary analyses, lepidocrocite (gamma-FeOOH) and goethite (alpha-FeOOH) were recognised as being the main corrosion products.
Atmospheric corrosion tests in Brazilian Legal Amazon - field and laboratory tests
Atmosphärische Korrosion im brasilanischen Amazonasgebiet - Feld- und Laborversuche
Miranda, L.R.M. (Autor:in) / Sathler, L. (Autor:in) / Nogueira, R. (Autor:in) / Brasil, S.L.D.C. (Autor:in)
Materials and Corrosion ; 51 ; 182-185
2000
4 Seiten, 6 Bilder, 3 Tabellen, 5 Quellen
Aufsatz (Zeitschrift)
Englisch
atmosphärische Korrosion , Bewitterungsversuch , Naturversuch , Brasilien , Anstrich (Überzug) , Korrosionsschutzmittel , Korrosionsschutz , Laboratoriumsversuch , Simulationsversuch , saurer Regen , Korrosionspotenzial , Potenzialzeitkurve , pH-Einfluss , Ionenleitfähigkeit , Anstrichmittel , Lebensdauer , Prüfverfahren
Atmospheric corrosion tests in Brazilian Legal Amazon - field and laboratory tests
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