MOSSBAUER STUDIES OF CORROSION OF METALLIC GLASSES Fe//8//1B//1//3//. //5Si//3//. //5C//2 AND Fe//6//7Co//1//8B//1//4Si//1 IN AMMONIUM NITRATE SOLUTION.

The corrosion of metallic glasses Fe//8//1B//1//3//. //5Si//3//. //5C//2 (Metglas 2605 SC) and Fe//6//7Co//1//8B//1//4Si//1 (Metglas 2605 CO) in 45 ammonium nitrate solution has been followed at room temperature and higher temperatures to 90 degree C for periods of time between 15 minutes to 1 day. Moessbauer spectroscopy at RT and at liquid nitrogen temperature (79K) and X-ray diffraction were used to follow the formation and transformation of products formed. During the initial stage of corrosion, hydroxides and oxides are formed in their superparamagnetic state. The corrosion proceeds in both types of metglasses in the same way except that Fe//6//7Co//1//8B//1//4Si//1 is more corrosion resistant. Morphology of corrosion products was studied using optical and scanning electron microscopy