Leaching behavior of cathode ray tube (CRT) glasses

抄録

The leaching behavior of cathode ray tube (CRT) funnel and neck glasses were compared in 0.001 N HCl and 0.001 N NaOH at 70 and 90°C. We measured the weight loss and leached amount of each component and observed the surface changes by scanning electron microscopy (SEM). In acid solution funnel glass showed t^1/2-dependent leaching, whereas neck glass only demonstrated congruent dissolution after 8 weeks. In basic solutions leaching behavior was almost equivalent for both types of glass. Dissolution halted after one or two weeks as a result of the deposition of a protective layer. This layer was formed by saturation of Pb and was subsequently dissolvable by refreshing the leachant solution.