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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Leaching studies on naturally weathered potash-lime-silica glasses
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Leaching studies on naturally weathered potash-lime-silica glasses

机译：自然风化钾钙硅玻璃的浸出研究

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Within the international, EU-supported research project MULTI-ASSESS more than 150 glass samples with a chemical composition similar to medieval stained glasses were exposed in six European cities (Athens, Krakow, London, Prague, Rome and Riga) to the local environmental and climatic conditions. After exposure periods of 6 or 12 months the samples were investigated in the scanning electron microscope with energy dispersive X-ray microanalysis (SEM/EDX). Surface analyses indicate that the main weathering products were sulphates such as syngenite ((CaSO4K2SO4H2O)-K-.-H-.) and gypsum (CaSO(4)(.)2H(2)O). Chlorides, organic compounds and/or carbonates or nitrates of the elements K, Ca and Na were predominantly detected on the 6-months samples, whereas Si-containing compounds appeared particularly on the 12-months samples. Linescan measurements performed on the cross-sectioned glass samples allowed for the determination of leaching depths of the network modifier ions according to an evaluation procedure recently presented. The average leaching depths after 6 months of exposure were d(K) = 0.88 +/- 0.43 mu m, d(Ca) = 0.62 +/- 0.37 mu m, d(Na) = 0.34 +/- 0.32 mu m and d(Mg) = 0.16 +/- 0.18 mu m. After 12 months an average increase of the leaching depths between 38% (K) and 63% (Mg) is observed. No leaching could be determined for the network former elements Al and P. A clear influence of the environmental conditions at the atmospheric test sites on the degree of weathering was observed. In a first approximation, the leaching depths exhibit a linear dependence on a general pollution factor comprising the concentrations of the acidifying gases SO2, NO2 and O-3. (c) 2006 Elsevier B.V. All rights reserved.
机译：在国际，欧盟支持的研究项目MULTI-ASSESS中，超过六个化学成分类似于中世纪彩色玻璃的玻璃样品在六个欧洲城市（雅典，克拉科夫，伦敦，布拉格，罗马和里加）暴露在当地环境中。气候情况。暴露6或12个月后，在扫描电子显微镜中用能量色散X射线微分析（SEM / EDX）研究样品。表面分析表明，主要的风化产物是硫酸盐，例如亚硫酸盐（（CaSO4K2SO4H2O）-K -.- H-。）和石膏（CaSO（4）（。）2H（2）O）。在6个月的样品中主要检测到元素K，Ca和Na的氯化物，有机化合物和/或碳酸盐或硝酸盐，而在12个月的样品中尤其发现了含硅化合物。对横截面玻璃样品进行的线扫描测量可以根据最近提出的评估程序确定网络改性剂离子的浸出深度。暴露6个月后的平均浸出深度为d（K）= 0.88 +/- 0.43μm，d（Ca）= 0.62 +/- 0.37μm，d（Na）= 0.34 +/- 0.32μm和d （Mg）＝ 0.16 +/-0.18μm。 12个月后，观察到浸出深度平均增加了38％（K）至63％（Mg）。对于网络形成元素Al和P，不能确定浸出。观察到大气测试点处的环境条件对风化程度的明显影响。在第一近似中，浸出深度对包括酸化气体SO 2，NO 2和O-3的浓度的一般污染因子表现出线性依赖性。 （c）2006 Elsevier B.V.保留所有权利。

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