Convenient extraction method for quantification of thin zinc patina layers

作者：Saarimaa Ville^*; Kaleva Aaretti; Paunikallio Teemu; Nikkanen Juha Pekka; Heinonen Saara; Levanen Erkki; Vaisanen Pasi; Markkula Antti

来源：Surface and Interface Analysis, 2018, 50(5): 564-570.

DOI：10.1002/sia.6429

• galvanized steel
• glycine
• supercritical carbon dioxide
• zinc carbonate
• zinc nanowires
• zinc oxide

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 Zn2+ 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 degrees C). The results were verified by scanning electron microscopy imaging and Fourier transform infrared spectroscopy measurements.

• 出版日期2018-5