Effects of exposure direction and inclination on the runoff rates of zinc and copper roofs

The effect of exposure direction and inclination on the runoff rates of both zinc and copper has been studied by field exposures on model roofs. Runoff rates decrease with higher inclinations from horizon and are higher for exposures directed towards the prevailing wind direction. At a given polluti...

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Bibliographic Details
Published in:Corrosion science 2000-08, Vol.42 (8), p.1471-1487
Main Authors: Odnevall Wallinder, I, Verbiest, P, He, W, Leygraf, C
Format: Article
Language:English
Subjects:
Applied sciences
Copper
Corrosion
Corrosion environments
Exact sciences and technology
Exposure direction
Inclination
Metals. Metallurgy
Runoff
Zinc
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Summary:The effect of exposure direction and inclination on the runoff rates of both zinc and copper has been studied by field exposures on model roofs. Runoff rates decrease with higher inclinations from horizon and are higher for exposures directed towards the prevailing wind direction. At a given pollution concentration, the metal runoff is largely governed by the precipitation volume impinging on the surface. In this study the field exposure results were compared to laboratory tests on zinc and copper panels with different inclinations. Current literature mainly describes runoff rates for zinc and copper panels inclined 45° facing south. Calculations of the average runoff rate using the runoff rates obtained on the model roofs as well as market information show that the effect of inclination, orientation and degree of sheltering are important parameters to consider while estimating runoff rates from existing buildings.
ISSN:0010-938X
1879-0496
1879-0496
DOI:10.1016/S0010-938X(99)00145-6