Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of leaf litter on corrosion of gutters
Leaf litter is commonly deposited onto roofs, where it affects the local environmental conditions that control the degradation of roof sheeting and gutters. This study investigated the chemical nature and corrosivity of electrolytes resulting from the infusion of deionised water with leaf litter. Leaf litter specimens were collected from a variety of tree species commonly found in southern Australian suburbs, and from gutters in which the leaf litter had accumulated. After infusion for approximately three weeks, leaf litter suspensions were filtered and the electrolytes present in the filtrates were analysed to determine their chemical composition and pH levels. The filtrates from leaf litter obtained directly from trees tended to contain higher concentrations of salts and increased acidity compared to the suspensions from leaf litter sampled from gutters. The corrosivity of the electrolytes was explored electrochemically by potentiodynamic analysis of rolled zinc coupons immersed into the filtrates. Leaf litter was found to influence corrosion rates by increasing the acidity of solutions, and through the release of chloride ions during organic matter decomposition. Soluble products of leaf litter decomposition (i.e. fulvic acids) appeared to provide limited protection against corrosion. Over time, the aggressiveness of electrolytes in gutters should decrease as rain events leach salts from leaf litter, and pH should be buffered through the adsorption of carbon dioxide and possibly through the deposition of airborne dust such as mineralogical particles. In addition to the chemical impacts of leaf litter on corrosion, it can also result in gutters being exposed to longer periods of wetness. Data from wetness sensors installed in both clean and dirty gutters showed that, once wet, gutters containing leaf litter can take over twenty-five times longer to dry than clean gutters. Although there are many variables involved, it has been shown that leaf litter can influence long term zinc corrosion rates by a factor of over 2.
Influence of leaf litter on corrosion of gutters
Leaf litter is commonly deposited onto roofs, where it affects the local environmental conditions that control the degradation of roof sheeting and gutters. This study investigated the chemical nature and corrosivity of electrolytes resulting from the infusion of deionised water with leaf litter. Leaf litter specimens were collected from a variety of tree species commonly found in southern Australian suburbs, and from gutters in which the leaf litter had accumulated. After infusion for approximately three weeks, leaf litter suspensions were filtered and the electrolytes present in the filtrates were analysed to determine their chemical composition and pH levels. The filtrates from leaf litter obtained directly from trees tended to contain higher concentrations of salts and increased acidity compared to the suspensions from leaf litter sampled from gutters. The corrosivity of the electrolytes was explored electrochemically by potentiodynamic analysis of rolled zinc coupons immersed into the filtrates. Leaf litter was found to influence corrosion rates by increasing the acidity of solutions, and through the release of chloride ions during organic matter decomposition. Soluble products of leaf litter decomposition (i.e. fulvic acids) appeared to provide limited protection against corrosion. Over time, the aggressiveness of electrolytes in gutters should decrease as rain events leach salts from leaf litter, and pH should be buffered through the adsorption of carbon dioxide and possibly through the deposition of airborne dust such as mineralogical particles. In addition to the chemical impacts of leaf litter on corrosion, it can also result in gutters being exposed to longer periods of wetness. Data from wetness sensors installed in both clean and dirty gutters showed that, once wet, gutters containing leaf litter can take over twenty-five times longer to dry than clean gutters. Although there are many variables involved, it has been shown that leaf litter can influence long term zinc corrosion rates by a factor of over 2.
Influence of leaf litter on corrosion of gutters
Einfluss von Laubablagerung auf die Korrosion von Abflussrinnen
Bradbury, A. (Autor:in) / Muster, T.H. (Autor:in) / Ganther, W.D. (Autor:in) / Cole, I.S. (Autor:in) / Corrigan, P.A. (Autor:in)
Corrosion Engineering, Science and Technology ; 45 ; 268-276
2010
9 Seiten, 5 Bilder, 3 Tabellen, 26 Quellen
Aufsatz (Zeitschrift)
Englisch
Influence of leaf litter on corrosion of gutters
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