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Corrosion of Inorganic Non-Metallic Materials Ale š Helebrant Department of Glass and Ceramics I CT Prague , Czech R

Corrosion of Inorganic Non-Metallic Materials Ale š Helebrant Department of Glass and Ceramics I CT Prague , Czech Republic www.usk.cz. Contents. Inorganic Non-Metallic Materials Principles of INM corrosion, congruent and incongruent dissolution

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Corrosion of Inorganic Non-Metallic Materials Ale š Helebrant Department of Glass and Ceramics I CT Prague , Czech R

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  1. Corrosion of Inorganic Non-Metallic MaterialsAleš HelebrantDepartment of Glass and Ceramics ICT Prague, Czech Republicwww.usk.cz Corrosion of Materials Course

  2. Contents • Inorganic Non-Metallic Materials • Principles of INM corrosion, congruent and incongruent dissolution • Control mechanisms of dissolution, mathematical description • Corrosion of ceramics • Corrosion of glass • Enamels as surface layers on metals • Corrosion of concrete • Typical examples of materials • Corrosion mechanisms • Increasing chemical durability Corrosion of Materials Course

  3. Literature for further study • McCauley R.A.: Corrosion of Ceramics. Marcel Dekker, Inc. New York 1995 • Clark D.E., Zoitos B.K. (eds.): Corrosion of Glass, Ceramics and Ceramic Superconductors. Noyes Publications, Park Ridge, New Jersey, 1992 • Doremus, R.H.: Chemical durability of glass. In: Tomozawa, M;, Doremus, R.H. (eds.): Treatise on Materials Science and Technology 17, Academic Press 1979, pp. 41-67 • Helebrant A.: Kinetics of corrosion of silicate glasses in aqueous solutions. Ceramics-Silikáty 41, 147-151 (1997) • Helebrant A., Jiřička A., Jiřičková J.: Corrosion of glass. Glass Sci. Tech. 77C, 85-94 (2004) • Jiřička A. et al.: Corrosion modeling of simple glasses from the systems SiO2-Na2O-CaO and SiO2-Na2O-MgO. Glass Sci.Tech. 76, 298-308 (2003) • Jiřička A., Helebrant A.: Dissolution of soda-lime, silica and high-level waste glass by single-pass flow-through and static tests. In: Environmental Issues and Waste Management Technologies in the Ceramic and Nuclear Industries V (Ceramic Transactions, Vol 107, eds. Chandler G.T., Feng X.), The American Ceramic Society, Westerville, OH, USA, 2000, pp.309-316 Corrosion of Materials Course

  4. Inorganic Non-metallic Materials • INM • Ceramics • Glass • Inorganic binders (cement, gypsum) • Monocrystals • Glass-ceramics • Inorganic Non-Metallic Materials = Ceramics (US) • Ceramics (UK) = pottery, construction ceramics, porcelain, refractories..... • Traditional INM – based on silicates or silica Corrosion of Materials Course

  5. Structure of INM cristobalite Corrosion of Materials Course

  6. Structure of INM K2O-SiO2 glass Corrosion of Materials Course

  7. Structure of INM silica glass crystalline silica (quartz) Corrosion of Materials Course

  8. Structure of INM periclase MgO Corrosion of Materials Course

  9. Structure of INM zeolite Corrosion of Materials Course

  10. Corrosion of INM • corrosion of metals – electrochemical process • corrosion of INM – dissolution • reaction with liquids (aqueous solutions, melts) • reaction with gasses • sometimes connected with subsequent degradation Corrosion of Materials Course

  11. Dissolution incongruent congruent t=0 t>0 Corrosion of Materials Course

  12. Congruent dissolution solidus liquidus 1) surface reaction 2) transport of surface reaction products into the solution bulk (diffusion) Which process controls the overal rate of dissolution? Corrosion of Materials Course

  13. Models of congruent dissolution • non-steady diffusion • steady state diffusion • surface reaction • surface reaction and steady state diffusion Corrosion of Materials Course

  14. Diffusion – Fick‘s laws Corrosion of Materials Course

  15. saturated conc cs conc. in bulk solution cl Non-steady diffusion Corrosion of Materials Course

  16. Error function Corrosion of Materials Course

  17. Non-steady diffusion Corrosion of Materials Course

  18. saturated conc. cs conc. in bulk solution cl h Steady-state diffusion Corrosion of Materials Course

  19. Steady-state diffusion Corrosion of Materials Course

  20. Surface reaction saturated conc. cs conc. in bulk solution cl Corrosion of Materials Course

  21. Surface reaction Corrosion of Materials Course

  22. saturated conc. cs conc. in bulk solution cl h SR comparable with SD c‘<cs Corrosion of Materials Course

  23. SR comparable with SD Corrosion of Materials Course

  24. Saturation effect Corrosion of Materials Course

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