Atmospheric corrosion of zinc-aluminum alloyed coated steel in depleted carbon dioxide environments
2018 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 165, no 7, p. C343-C353Article in journal (Refereed) Published
Abstract [en]
NaCl induced corrosion of Zn-0.2Al, Zn-5Al and Zn-55Al coated steel was investigated at low and ambient CO2 levels.Weight loss measurements revealed an enhancement of the corrosion of Zn-0.2Al and particularly Zn-5Al in low CO2. This was connected to an increase of surface pH in a low CO2 atmosphere promoting the formation of ZnO and layered double hydroxide for Zn-5Al. For Zn-55Al, CO2 depletion did not affect the surface pH due to the acidification effect of Al3+. Preferential dissolution of zinc rich phase was observed on cross-sections, particularly in depleted CO2 experiments. Different sequences of corrosion product formation were proposed for the different Zn-Al coatings. © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/),
Place, publisher, year, edition, pages
Electrochemical Society Inc. , 2018. Vol. 165, no 7, p. C343-C353
Keywords [en]
Alloy steel, Aluminum alloys, Aluminum coated steel, Aluminum coatings, Atmospheric corrosion, Binary alloys, Carbon dioxide, II-VI semiconductors, Sodium chloride, Steel corrosion, Zinc alloys, Zinc oxide, Al coated steels, Al coatings, Coated steel, Corrosion products, Layered double hydroxides, Loss measurement, Preferential dissolution, Zinc-aluminum, Aluminum corrosion
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-40004DOI: 10.1149/2.0721807jesScopus ID: 2-s2.0-85060566710OAI: oai:DiVA.org:ri-40004DiVA, id: diva2:1359444
Note
Funding details: Research Fund for Coal and Steel, RFRS-CT-2015-00011; Funding details: European Commission; Funding text 1: The financial support of the European Commission through Research Fund for Coal and Steel (Contract RFRS-CT-2015-00011) is acknowledged. Philippe Verpoort (OCAS) is thanked for the supply of metallic coated materials and Anne Le Gac (Institut de la Corrosion) for the laboratory tests.
2019-10-092019-10-092023-05-26Bibliographically approved