Author： Hu Yingjie Cheng Jijian
Publisher： Society of Glass Technology
ISSN： 0017-1050
Source： Glass Technology - European Journal of Glass Science and Technology Part A, Vol.41, Iss.2, 2000-04, pp. : 65-70
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Abstract
Glass substrates were dip coated with CaO–BaO–SiO2–TiO2 system sols which were stabilised by chelation with acetic acid. Infrared absorption spectra were taken to understand the processes of sol formation and gel to glass transition. The change in surface composition of coated substrates due to immersion in alkaline solution up to 144 h was characterised by scanning electron microscopy (SEM) and atom absorption spectrophotometry analysis. It was found that alkali corrosion of the coated substrate results in the formation of insoluble TiO2 rich film and sodium and calcium silicate crystals. The reaction between the coating and hydroxyl ions was suppressed by a TiO2 rich film. On the other hand, silicate crystals etched the surface during growth to give rise to etched pits which cause dissolution of the oxides of Si, Ca and Na of the substrates as immersion time increased. However, the anticorrosion coating was an effective barrier against alkali attack since the coating was not detached from the glass surface during alkali immersion. It was also shown that alkali durability depends on the composition of the coating.
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