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Effects of ion-exchange and hydrolysis mechanisms on lead silicate glass corrosion

Ali Rahimi, R ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.5006/0528
  3. Publisher: 2012
  4. Abstract:
  5. Corrosion of lead silicate glass (LSG) contacting 0.5 M aqueous nitric acid (HNO 3) was investigated via scanning electron microscopy, energy-dispersive spectroscopy, inductively coupled plasma analysis, and weight-loss measurement to determine the respective contributions of the ion-exchange vs. the hydrolysis reactions. The LSG having X M ≡ Pb+K+Na/Si mole ratios of less than 0.7 showed very little weight loss with no Si network deterioration. At X M > 0.7, the mechanism changed into the hydrolysis, which caused the formation of a networkless gel layer resting at the solid/liquid interface. Addition of titania (TiO 2) and zirconia (ZrO 2) had disparate effects: X M < 0.7 improved corrosion resistance; while X M > 0.7 caused detrimental consequences
  6. Keywords:
  7. Acid corrosion ; Glass ; Titanium ; Weight loss ; Zirconium ; Acid corrosion ; Aqueous nitric acid ; Gel layers ; Hydrolysis reaction ; Inductively coupled plasma analysis ; Lead silicate glass ; Mole ratio ; Solid/liquid interfaces ; TiO ; Titania ; Weight loss ; Weight loss measurements ; Corrosion resistance ; Energy dispersive spectroscopy ; Glass ; Hydrolysis ; Inductively coupled plasma ; Lead ; Nitric acid ; Scanning electron microscopy ; Silicates ; Titanium ; Titanium dioxide ; Zirconia ; Zirconium ; Ion exchange
  8. Source: Corrosion ; Volume 68, Issue 9 , September , 2012 , Pages 793-800 ; 00109312 (ISSN)
  9. URL: http://corrosionjournal.org/doi/abs/10.5006/0528