Corrosion of Lead Glasses in Acid Media: I, Leaching Kinetics |
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Authors: | SUSAN WOOD J. R. BLACHERE |
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Affiliation: | Department of Metallurgical and Materials Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261 |
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Abstract: | The leaching kinetics of lead glasses (25 to 35 mol% PbO-75 to 65 mol% SiO2; some with K2O and A12O3, additions) were determined in 10% acetic acid. Except for a ternary glass (SiO2-PbO-K2O) which had a linear dependence on time, all compositions exhibited a linear dependence on the square root of time for the amount of Pb and K removed. Increasing the SiO2: PbO ratio or the Al2O3 content improved the durability whereas adding K2O to a binary PbO-Si02 glass greatly increased the corrosion rate. Activation energies for the rates of Pb and K removal were determined for three compositions and it was deduced that the diffusion of H+ controlled the leaching for binary and 4-component glasses whereas dissolution of the silica network was rate-controlling for the ternary. |
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