Ceramics-Silikáty 51, (4) 235 - 241 (2007)

Glass is generally considered to be a chemically durable material; nevertheless it is attacked by various corrosive solutions (corrosion process). A special case is so called line corrosion, which is caused by dissolution of surface layers of household glass during automatic washing. The goal of this work was to standardize visual method of homogeneity measurement by Shelyubskii method and to analyze the mechanism of creation of the line corrosion. Both goals consider the influence of temperature of glass melt in melting process on line corrosion. An attempt was made to identify relation between the homogeneity of glass and the extent of line corrosion as the means of estimation of the susceptibility of glass to line corrosion without necessity perform time consuming washing tests. Damaged samples coming from the dishwashing process were analyzed by optical microscopy, scanning electron microscopy and electron dispersive X-ray analysis after the visual control. Line corrosion origin was identified in the forehearth channel as a consequence of dissolution of AZS refractory. The most important parameter influencing the extent of the line corrosion is the temperature of glass melt in the melting tank.