Corrosion behaviour of a phase separated ZrF4-FeF3-PbF2 based glass

the leaching behaviour of ZrF4-FeF3-FbF(2) based floride glass in static de ionized water was investigated at 18 degrees C and 60 degrees C. The corros ion process was monitored by solution analysis of individual elements leach ed into solution versus time. The leach rate observed for this glass was hi gher than that of most other fluoride glasses. The corrosion process follow ed a nearly time(1/2) dependence,implying a diffusion rate controlled proce ss. Zr exhibited the highest normalized leach rate at 18 degrees C, while a t 60 degrees C the Fe leach rate was greatest. The IR spectra indicated the formation of a hydrated leach layer on the glass surface. The phase separa ted structure of this glass is believed to influence the corrosion mechanis ms.