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Influence of microstructure of zinc-aluminium-magnesium alloy coated steel on the corrosion behavior in outdoor marine atmosphere
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
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2019 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 374, p. 897-909Article in journal (Refereed) Published
Abstract [en]

Model hot-dip Zn-Al-Mg coatings with various microstructures were produced in a galvanising simulator by changing the cooling rate. Full characterization of the coatings was performed to identify the chemical composition of the different phases, the size of the grains and their distribution. The corrosion properties of the model microstructures were investigated in outdoor marine atmosphere up to 2 years. Weight loss measurements and cross section observations revealed a tendency for fine microstructures enriched in eutectic phases to be the most corrosion resistant. This was connected to a lower size of cathodic areas at the surface (zinc dendrites), the preferential dissolution of Mg-rich phase (eutectic) and the formation of a stable layered double hydroxide on the surface.

Place, publisher, year, edition, pages
Elsevier B.V. , 2019. Vol. 374, p. 897-909
Keywords [en]
Atmospheric corrosion, Hot-dip coating, Microstructure, Zinc aluminium magnesium, Alloy steel, Aluminum alloys, Aluminum coated steel, Aluminum coatings, Aluminum corrosion, Corrosion resistance, Corrosive effects, Eutectics, Magnesium alloys, Seawater corrosion, Ternary alloys, Zinc alloys, Zinc coatings, Chemical compositions, Fine microstructure, Hot-dip coatings, Layered double hydroxides, Modeling microstructures, Preferential dissolution, Weight loss measurements, Zinc aluminiums, Steel corrosion
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Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-39371DOI: 10.1016/j.surfcoat.2019.06.052Scopus ID: 2-s2.0-85068176203OAI: oai:DiVA.org:ri-39371DiVA, id: diva2:1335956
Note

Funding details: Research Fund for Coal and Steel, RFCS, RFSR-CT-2015-00011; Funding details: European Commission, EC; Funding text 1: The financial support of the European Commission through Research Fund for Coal and Steel (Contract RFSR-CT-2015-00011 ) is acknowledged. Anne Le Gac (Institut de la Corrosion) for the laboratory tests.

Available from: 2019-07-08 Created: 2019-07-08 Last updated: 2019-07-08Bibliographically approved

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