Abstract
Recently there has been anincreased environmental concern in severalcountries in Europe, in particular in Sweden andin the Netherlands regarding the amount of copperand zinc that is released from building materialsinto society. Due to lack of runoff data, thelegislators have so far used corrosion ratesmeasured during the last 20 years to calculatequantities of metal released from buildingsassuming that the quantity of metal corrosionequals the quantity of metal runoff. Withdecreasing levels of environmental pollutantsduring the last decade in Europe, it is importantto determine more recent and hence morerepresentative corrosion and runoff rates to beused in the calculations. For this reason a field exposure program was implemented during 48 weeks in an urbanatmosphere in Sweden determining corrosion andrunoff rates for copper and zinc of differentage. New copper exposed for 48 weeks in the urbanatmosphere shows a corrosion rate of 6.7gm-2y-1 and an almost constant runoff rate of1.3 gm-2y-1 during the period. Therunoff rate is significantly lower than thecorrosion rate and represents only a fraction(≤20%) of the total amount of corroded metalduring this period. Zinc shows a graduallydecreasing corrosion rate with time being 5.0gm-2y-1 after 48 weeks of exposure. Therunoff rate is relatively stable with an averagerate of 3.1 gm-2y-1 during the sameperiod. This value represents ≈60% of the totalamount of corroded zinc. The effect of panel age has been investigatedin parallel field and laboratory studies. Theresults show that naturally aged copper exhibitssomewhat higher average runoff rates (2 gm-2y-1) than new copper, probably due to acombined effect of storage and weatherconditions. No significant difference in runoffrate can be found between new and naturally agedzinc. The field and laboratory investigationsshow that precipitation rate and amount influence the magnitude of the runoff rate forboth copper and zinc.
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References
Cramer, S., Carter J. P., Linstrom P. J. and Flinn D. R.: 1988, in S. W. Dean and T. S. Lee (eds), Degradation of Metals in the Atmosphere, ASTM STP 965, American Society for Testing and Materials, Philadelphia, 229.
Cramer, S. D. and McDonald, L. G.: 1990, in R. Baboian and S. W. Dean (eds), Corrosion Testing and Evaluation: Silver Anniversary Volume, ASTMSTP 1000, American Society for Testing and Materials, Philadelphia, 241.
Cramer, S. D., McDonald, L. G. and Spence, J. W.: 1993, Proc. 12th International Corrosion Congress, NACE International, Houston, TX, 2, 722.
FitzGerald, K. P.: 1996, Natural Copper Patina, Thesis, Dep. of Mining and Metallurgical Engineering, University of Queensland, Australia.
Flinn, D. R., Cramer, S. D., Carter, J. P., Hurwitz, D. M. and Linstrom P. J.: 1986, ACS Symposium Series 318, in R. Baboian (ed.), Materials Degradation Caused by Acid Rain, American Chemical Society, Washington DC, 119.
Franey, J. P. and Davis, M. E.: 1987, Corros. Sci. 23(7), 659.
Graedel, T. E.: 1986, Corros. Sci. 27(7), 721.
Granat, L.: 1990, Swedish Environmental Protection Agency Report 3942, in Swedish.
Kucera, V. and Collin, M.: 1977, Eurocorr '77, 6th European Congress on Metallic Corrosion, London, 189.
Lehmann, B.: 1995, ‘Freiwitterungsverhalten von Dächern mit Metalldeckung’, Dissertation, Universität von Hannover, Germany.
Odnevall, I. and Leygraf, C.: 1997, Corros. Sci. 39(12), 2039.
Oesch, S. and Heimgartner, P.: 1996, Mat. and Corros. 47, 425.
Verbiest, P., Waeterschoot, H., Racek, R. and Leclerq, M.: 1997, Prot. Coat. Europe, 47.
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He, W., Wallinder, I.O. & Leygraf, C. A Comparison Between Corrosion Rates and Runoff Rates from New and Aged Copper and Zinc as Roofing Material. Water, Air, & Soil Pollution: Focus 1, 67–82 (2001). https://doi.org/10.1023/A:1017547903442
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DOI: https://doi.org/10.1023/A:1017547903442