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Lead‐Ion Stability in Soda–Lime Lead Silicate Glasses
Author(s) -
Lehman Richard L.
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04483.x
Subject(s) - soda lime , corrosion , silicate glass , silicate , mineralogy , calcium silicate , chemical stability , materials science , lime , ion , lead glass , sodium , sodium silicate , inorganic chemistry , chemistry , metallurgy , composite material , organic chemistry
Sodium‐calcium‐lead silicate glass compositions were prepared over a wide compositional range by conventional glass‐melting methods. The acid chemical stability of the glass structure was studied by corroding samples of glass in 4% acetic acid solution at 22°C for periods up to 24 h. Lead corrosion stability was evaluated by measuring lead concentrations in the corrosion solution. At short times, parabolic time dependence was observed and the parabolic time coefficients were regressed against composition, yielding a simple additive relationship. A similar model was fitted to 24‐h release data, which showed compositional effects similar to the 2‐h data. Of the oxides studied, sodium was the most detrimental to durability, and the coefficients of the oxides decreased in the series: Na 2 O, PbO, CaO, SiO 2 . The effects of the oxides could be partially explained by the number of nonbridging oxygens expected in the glass structure, and the residual effect was attributed to cation characteristics. Small phosphate additions to the glass greatly increased the lead‐ion stability under nearly all experimental conditions examined.