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Long-term atmospheric corrosion rates of Zn55Al-coated steel
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0001-5462-2700
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0003-2042-1235
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-1753-9972
2024 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176Article in journal (Refereed) Epub ahead of print
Abstract [en]

Hot-dip Zn55Al-coated steel samples have been exposed for up to 6 years at 11 different weathering sites, including marine, marine-industrial, acid-rain and dry atmospheres. From the mass loss measurements, Zn55Al metallic coating showed globally long-term good corrosion resistance in all weathering conditions compared with hot-dip Zn-0.2Al-coated steel (Z). Yet, weaker performance was observed on Zn55Al in high SO2 polluted atmosphere, particularly when combined with seawater aerosols. This is explained by a more acidic surface condition linked to high SO2. Although the extent of corrosion in this phase was different at the different sites, the final corrosion products formed after 6 years were rather similar at all sites. This consists of hydrous aluminium sulphate or hydrous aluminium hydroxy sulphate and, probably also a smaller amount of sulphate-containing zinc corrosion products or Al/Zn products.

Place, publisher, year, edition, pages
John Wiley and Sons Inc , 2024.
Keywords [en]
atmospheric corrosion, hot-dip zinc-coated steel, zinc aluminium, Acid rain, Aluminum alloys, Aluminum coated steel, Aluminum coatings, Aluminum corrosion, Binary alloys, Corrosion rate, Corrosion resistance, Corrosion resistant coatings, Seawater corrosion, Steel corrosion, Sulfur compounds, Weathering, Zinc alloys, Zinc coatings, Atmospheric corrosion rates, Coated steel, Corrosion products, Dry atmospheres, Hot dips, Hot-dip zincs, Mass-loss measurement, Steel samples, Zinc-coated steel
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:ri:diva-71953DOI: 10.1002/maco.202314209Scopus ID: 2-s2.0-85181487920OAI: oai:DiVA.org:ri-71953DiVA, id: diva2:1840881
Note

ArcelorMittal, voestalpine, SSAB Europe, Ternium, TataSteel and Bluescope steel are acknowledged for thefinancial support.

Available from: 2024-02-27 Created: 2024-02-27 Last updated: 2024-05-27Bibliographically approved

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Thierry, DominiquePersson, DanLe Bozec, Nathalie

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