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The influence of alkali-degreasing on the chemical composition of hot-dip galvanized steel surfaces
Dalarna University, School of Technology and Business Studies, Material Science.
Dalarna University, School of Technology and Business Studies, Material Science.
Dalarna University, School of Technology and Business Studies, Material Science.
2006 (English)In: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 38, no 7, p. 1130-1138Article in journal (Refereed) Published
Abstract [en]

The influence of dipping temperature and time on the surface chemistry of hot-dipped galvanized steel sheets during the alkaline degreasing process is investigated. The surface chemistry was monitored with scanning Auger electron spectroscopy (AES), X-ray photoelectron spectroscopy (XPS), and time-of-flight secondary ion mass spectroscopy (ToF-SIMS). The results show high Al concentrations on the untreated surfaces, which are significantly reduced during alkaline degreasing. The same conclusions could be drawn for the carbon compounds that accumulate on the surface during storage. The measurements reveal a gradual reduction in surface Al as the alkali solution temperature and/or degreasing time are increased. When degreasing was conducted at 70 °C for 30 s the surface was practically free from Al, which was present only in small islands. Furthermore, the experiments showed that the thickness of the oxide film covering the surfaces before and after alkaline degreasing is approximately 20 Å. The main constituents of the film varied from ZnAl hydroxide/oxide to Zn hydroxide/oxide, before and after degreasing, respectively. 

Place, publisher, year, edition, pages
2006. Vol. 38, no 7, p. 1130-1138
Keywords [en]
AES; corrosion; galvanized steel; ToF-SIMS; XPS
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:du-2687DOI: 10.1002/sia.2364ISI: 000239052700004OAI: oai:dalea.du.se:2687DiVA, id: diva2:519807
Available from: 2007-04-04 Created: 2007-04-04 Last updated: 2017-12-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
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  • de-DE
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  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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