Spatial distribution and formation of corrosion products in relation to zinc release for zinc sheet and coated pre-weathered zinc at an urban and a marine atmospheric condition

Authors

  • J. Hedberg,

    1. Division of Surface and Corrosion Science, KTH, School of Chemical Science and Engineering, Dr. Kristinas v. 51, SE-100 44 Stockholm, (Sweden)
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  • N. Le Bozec,

    1. Institut de la Corrosion, Technopôle de Brest Iroise, 220 rue Pierre Rivoalon, 29200 Brest, (France)
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  • I. Odnevall Wallinder

    Corresponding author
    1. Division of Surface and Corrosion Science, KTH, School of Chemical Science and Engineering, Dr. Kristinas v. 51, SE-100 44 Stockholm, (Sweden)
    • Division of Surface and Corrosion Science, KTH, School of Chemical Science and Engineering, Dr. Kristinas v. 51, SE-100 44 Stockholm, (Sweden).
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Abstract

Zinc release data from 5 years of unsheltered exposures in a marine and an urban site is compiled for different zinc material types. The thin surface treatment on zinc materials is gradually detached after approximately 2 years at both sites, revealing the pre-weathered zinc surface unprotected. This consequently increased the release rates of zinc from this surface, whereas the zinc runoff rate from the bare zinc sheet remained relatively stable. Raman studies on bare zinc sheet exposed for 5 years at the marine site revealed zinc oxide of varying crystalline nature and hydrozincite to appear localized and separated from each other.

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