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The Effect of Microstructure on Local Corrosion Product Formation during Initial SO2-Induced Atmospheric Corrosion of ZnAlMg Coating Studied by FTIR-ATR FPA Chemical Imaging
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: 0000-0001-5462-2700
RISE Research Institutes of Sweden, Materials and Production, Corrosion.ORCID iD: 0000-0002-1753-9972
2023 (English)In: Corrosion and Materials Degradation, Vol. 4, no 3, p. 503-515Article in journal (Refereed) Published
Abstract [en]

The initial atmospheric corrosion of ZM (ZnAlMg)-coated steel in humid air (85% RH) and humid argon (85% RH) containing 320 ppb SO2 was studied using in situ infrared reflection absorption spectroscopy (IRRAS), FTIR-ATR focal plane array (FPA) imaging and SEM-EDS. The corrosion products formed in humid air containing SO2 are mainly composed of magnesium sulphites and sulphates, with sulphite-containing corrosion products formed initially while the contribution from sulphates increased with exposure time. The results from FTIR-FPA imaging and SEM-EDS showed that the magnesium sulphite and sulphate are formed mainly on eutectic phases with a higher quantity of corrosion products formed on the binary eutectic (Zn-MgZn2 ) phases. This is due to presence of microgalvanic elements with the zinc-rich phases as the main sites for the cathodic oxygen reduction while the anodic reactions take place on the eutectic areas. Sulphate content is the highest on the binary eutectic phases, due to the microgalvanic effects and the production of oxidants by the cathodic reaction, which increases the oxidation of sulphite to sulphate.

Place, publisher, year, edition, pages
2023. Vol. 4, no 3, p. 503-515
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Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-71123DOI: 10.3390/cmd4030026OAI: oai:DiVA.org:ri-71123DiVA, id: diva2:1831288
Note

This research received no external funding

Available from: 2024-01-25 Created: 2024-01-25 Last updated: 2024-01-25Bibliographically approved

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Persson, DanThierry, DominiqueLe Bozec, Nathalie

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