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SM ISO690:2012 SHARAGOV, Vasile, RAIFURA, Svetlana. Analysis of surface layers of container colorless glass, using section etching by HF Solution. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 181. |
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014 | ||||||
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" Chișinău, Moldova, 28-30 mai 2014 | ||||||
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Pag. 181-181 | ||||||
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The aim of the undertaken experiments was to investigate the regularity of surface layers |
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Cerif XML Export
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The investigation<br />was made using sectional glass-forming machines (IS-8-2, IS-6-2, AL-106-2) and rotor glassforming<br />machines (BB-7, BB-12). The variations of chemical composition of glasses is the<br />following (weight %): 72.0-72.8 SiO2, 1.0-1.9 Al2O3, 0.07-0.10 Fe2O3, 7.5-8.0 CaO, 3.7-4.0<br />MgO, 13.6-13.9 Na2O, 0.2-0.4 K2O and 0.2-0.4 SO3.<br />The analyses of glass surface layers have been carried out with the help of section etching<br />by HF solution. Three glass samples were fixed in fluorocarbon polymer cassettes and then fused<br />with a polymer wheel and put into a weak HF solution. The samples were rotated in the solution<br />with a speed of 100 rotations per minute. In the following experiments samples were kept in<br />solution in stationary position, i. e. without rotation. After etching the samples were washed with<br />distilled water, dried and weighed. The duration of etching changed within 3 to 120 minutes. The<br />thickness of the dissolved layer and rate of dissolution in HF solution of glass surface layers<br />were calculated based on mass losses of the samples before and after etching. The concentration<br />of Na+, K+ and Ca2+ was measured in extracts after etching by the method of flame photometry.<br />Preliminary experiments showed that the rate of dissolution of glass depends on the<br />temperature of the HF solution and its concentration, on the volume of solution and on the time<br />the samples were exposed to it, as well as on hydrodynamics conditions. The temperature of the<br />HF solution, its volume and concentration remained unchanged in all the experiments. The<br />dissolution of surface layer with the necessary thickness has been achieved through different<br />time of etching and changes of hydrodynamics conditions (the samples were rotated in solution<br />or kept in stationary position). The analysis of samples was carried out at the depth 100 μm. The<br />section etching was supplemented by light microscopy and determination of microhardness. The<br />samples were viewed under the microscope with magnification from 100 to 500 times.<br />The experiments showed that the rate of dissolution of all the samples in HF solution is<br />not stable. The medium rate of dissolution of the samples from jars and bottles is at the same<br />level, regardless of the method of glass-forming. It has also been established that there is a direct<br />correlation between the stability of the dissolution rate of glass surface layers and the thickness<br />of dissolved layer during one etching. We think, this shows the stratified structure of colorless<br />glass for container.<br />A correlation between the microhardness of glass and the rate of its dissolution has been<br />determined. The higher the glass microhardness is the lower its rate of dissolution in HF<br />solution. It has been revealed with the help of light microscopy that the bottles and jars consist of<br />layers without any determined orientation. The thickness of separate layers makes small parts of<br />μm. The character of stratification depends on the homogeneity of the glass, on the method and<br />conditions of its manufacture. 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