Electrochemical properties of corrosion products formed on Zn-Mg, Zn-Al and Zn-Al-Mg coatings in model atmospheric conditionsShow others and affiliations
2015 (English)In: Materials and corrosion - Werkstoffe und Korrosion, ISSN 0947-5117, E-ISSN 1521-4176, Vol. 66, no 8, p. 777-782Article in journal (Refereed) Published
Abstract [en]
The electrochemical properties of corrosion products formed under sodium chloride deposits on zinc coatings alloyed with aluminium and magnesium have been studied using impedance spectroscopy (EIS), scanning Kelvin probe (SKP) and photoluminescence (PL) techniques. The low-energy band gap identified in corrosion products on hot-dip galvanized steel was associated with their higher electric conductivity and efficiency of the rate-controlling oxygen reduction reaction. It was attributed to the presence of ZnO, zincite. The formation of ZnO was hindered by the alloying. The alloyed coatings were covered by more compact layers of corrosion products with lower electric conductivity and better barrier properties.
Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2015. Vol. 66, no 8, p. 777-782
Keywords [en]
atmospheric corrosion, impedance spectroscopy, kelvin probe, photoluminescence, Zn-Al-Mg coating, Aluminum coatings, Coatings, Corrosion, Electric conductivity, Electric conductivity measurement, Electrochemical impedance spectroscopy, Electrochemical properties, Electrolytic reduction, Energy gap, Galvanizing, Magnesium deposits, Probes, Sodium deposits, Spectroscopy, Zinc, Zinc alloys, Zinc chloride, Zinc coatings, Zinc oxide, Atmospheric conditions, Barrier properties, Corrosion products, Hot dip galvanized steels, Oxygen reduction reaction, Scanning Kelvin probes, Aluminum
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40037DOI: 10.1002/maco.201408058Scopus ID: 2-s2.0-84938549611OAI: oai:DiVA.org:ri-40037DiVA, id: diva2:1357028
2019-10-022019-10-022023-05-16Bibliographically approved