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Influence of composition on corroding process of Na2O-K2O-CaO-ZrO2-SiO2 glasses

I. Staňová, A. Plško, J. Pagáčová, and K. Šibíková

Department of Chemistry and Technology of Inorganic Materials, Faculty of Industrial Technologies, Alexander Dubček University in Trenčín, I. Krasku 1809/34, 020 01 Púchov, Slovakia

 

E-mail: istanova@fpt.tnuni.sk

Received: 27 April 2006  Revised: 20 June 2006  Accepted: 17 July 2006

Abstract: The corroding process of six glasses of the Na2O-K2O-CaO-ZrO2-SiO2 system with ZrO2content 0–2.13 mass % by water was observed during static tests at 121°C and pressure of 0.25 MPa in steam sterilizer. Significant increase of Na+ and K+ content in leachates was observed after the addition of ZrO2 into glass. Further increase of the content of ZrO2 in glasses slowed down the rate of Na+ and K+ leaching. The leaching process of SiO2 as well as Na+, K+, and Ca2+ ions was evaluated on the basis of comparison with model leaching processes. Variation of the concentrations of Na+, K+, Ca2+, and SiO2 in leachates with time was described by empirical equation. Observed changes in the initial leaching rates of Na+, K+, Ca2+, and SiO2 can be ascribed to the content of ZrO2 in glasses. The presence of ZrO2 in glasses reduced the overall rate of glass dissolution.

Keywords: glass corrosion/solubility - ZrO2 - leaching rate - static test

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-006-0088-7

 

Chemical Papers 61 (1) 11–15 (2007)

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