Cracks and Corrosion in PSG Passivation Glass

Aluminium corrosion and cracks in single-layer and triple-layer phosphosilicate glasses (PSG) were studied. The optimum phosphorus concentration for producing PSG passivation glass was found to be 3 to 5 mol%. The corrosion of the aluminium was found to proceed by two different processes; a simple electrolytic reaction with water induced by high current density and a cathodic reaction due to the high phosphorus concentration. In the formation of cracks in the glass, the deposition temperature was very important, as was the phosphorus concentration.