ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)