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Heinonen, Saara
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Publications (5/5 displayed)
- 2018Convenient extraction method for quantification of thin zinc patina layerscitations
- 2017Supercritical carbon dioxide treatment of hot dip galvanized steel as a surface treatment before coatingcitations
- 2017Investigation of long-term chemical stability of structured ZnO films in aqueous solutions of varying conditionscitations
- 2015Enhanced photoactive and photoelectrochemical properties of TiO2 sol-gel coated steel by the application of SiO2 intermediate layercitations
- 2015High temperature oxidation tests for the high velocity solution precursor flame sprayed manganese-cobalt oxide spinel protective coatings on SOFC interconnector steelcitations
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article
Convenient extraction method for quantification of thin zinc patina layers
Abstract
<p>Synthetic zinc patina was grown on galvanized steel sheets in supercritical carbon dioxide atmosphere. Different patina compounds were dissolved and quantified using a stepwise immersion and dissolution procedure. The distinct patina components, namely anhydrous zinc carbonate (a dense layer adjacent to metallic zinc) and zinc hydroxy carbonate (nanowires on the surface), were dissolved in glycine solutions, followed by quantification of Zn<sup>2+</sup> in the solutes by X-ray fluorescence. The zinc hydroxy carbonate nanowires were readily glycine soluble, and the anhydrous zinc carbonate showed scarce glycine solubility, which enabled their selective quantification. The amount of the remaining (anhydrous) zinc carbonate after glycine extraction was determined from the glycine-soluble zinc oxide after calcination (heat treatment for 10 minutes at 350°C). The results were verified by scanning electron microscopy imaging and Fourier transform infrared spectroscopy measurements.</p>