Influence of composition on corroding process of Na2O-K2O-CaO-ZrO2-SiO2 glasses |
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| Authors: | I. Staňová A. Plško J. Pagáčová K. Šibíková |
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| Affiliation: | (1) 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 |
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| 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. |
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| Keywords: | glass corrosion/solubility ZrO2 leaching rate static test |
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