INVESTIGATION OF CORROSION PROCESSES ON CLEAVAGE EDGES OF POTASH-LIME-SILICA GLASSES BY ATOMIC-FORCE MICROSCOPY

Corrosion phenomena on surfaces of potash-lime-silica glass with medie val composition have been imaged in-situ using AFM in combination with a home built sample holder and a commercial liquid cell. Measurements under ambient atmosphere lead to pit corrosion. Sample preparation an d measurement performed under liquids such as isobutanol inhibit the c orrosion process. Addition of water (10 vol%) induces the formation of a leached layer, where the network modifiers such as K and Ca are exc hanged by hydrogen-bearing species. During the measurements interactio ns of the tip with the sample surface have been observed.