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Atmospheric corrosion of zinc-based materials: runoff rates, chemical speciation and ecotoxity effects Odnevall Wallinder, I.; Leygraf, C.; Karlén, C.; Heijerick, D.; Janssen, C.R. (2001). Atmospheric corrosion of zinc-based materials: runoff rates, chemical speciation and ecotoxity effects. Corros.Sci. 43(5): 809-816 In: Corrosion science. Pergamon: Oxford, etc.. ISSN 0010-938X; e-ISSN 1879-0496, meer

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Trefwoorden

Atmospheric corrosion Chemical attack > Corrosion Corrosion rate Corrosion resistance Corrosion tests Toxicology > Ecotoxicology Zinc base alloys

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Odnevall Wallinder, I. Leygraf, C. Karlén, C.	Heijerick, D., meer Janssen, C.R., meer

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Abstract

In order to fill some major gaps of knowledge for future risk assessments, an interdisciplinary research effort is going on in order to generate relevant zinc runoff rate data from various commercial zinc-based materials, and to explore the relation between the chemical speciation of zinc in runoff water and its ecotoxicity. This study presents runoff rates, based on 1-year exposures of 15 zinc-based materials, which range from 0.07 to 3.5 g/m2 year. When collected immediately after release from the various zinc-based surfaces, chemical speciation modeling of the runoff water suggests that nearly all zinc (>95%) is present as hydrated Zn2+ ions, the most bioavailable speciation form. Evaluation of zinc runoff for possible environmental effects was performed through growth inhibition test with a green alga, Raphidocelis subcapitata. The results show a high correlation between the amount of zinc in the runoff and the environmental effect, suggesting, again, that all zinc is present as hydrated Zn2+, The insight gained aids in predicting actual ecotoxicity effects during environmental fate of zinc, based on chemical speciation of zinc in the runoff.

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