Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )
O 36.67: Poster
Dienstag, 12. März 2013, 18:15–21:45, Poster B2
Surface alteration during the corrosion of sodium silicate glasses — •Melanie Dathe and Hans Roggendorf — Martin-Luther-Universität Halle-Wittenberg, Institut für Physik
The dissolution of sodium silicate glasses is a standard method for the production of soluble glass (waterglass). Therefore, the processes of the dissolution of sodium silicate glasses are investigated. The composition of the sodium silicate glasses investigated here was Na2O · x SiO2, with x=2 and 3.3. The dissolution of the glass can be regarded as an extreme case of glass corrosion. During this process, layer formation arises at the surface, ion exchange occurs as well as dissolution of the altered surface. These changes at the interface glass - corrosion media were first observed with in-situ microscopy. Corrosion tests were executed under static and dynamic test conditions, in order to gain information about the dependence on time, temperature and ratio of sample surface to solution volume. The developed layers were analysed after the corrosion tests with scanning electron microscopy with energy dispersive analysis in order to gain elemental concentration profiles. Raman microscopy and infrared reflexion spectroscopy were used for identification of water species and their amounts. Besides layer characterisation, the gained corrosion values (pH value, concentration of dissolved species in the solution) were compared with established corrosion models.