Oxidation behaviour of AISI-316 steel in molten ionic salts at 650-1000-C

Abstract

Sodium sulphate (Na2S04) sodium meta-vanadate (NaV03) and its binary combination on the hot corrosion behaviour of AISI-316 steel in the temperature range 650-1000°C have been studied in flowing air The influence of NaV03-coated steel showed much higher oxidation rates than Na,S04-coated steel. This has been attributed to the decomposition of salt into volatile oxide, V,Os and it appeared to the sole reason for catastrophic corrosion. The addition of Na,S04 to NaV03 lowered the oxidation rate of coated steel due to nonformation of volatile product in the temperature range 650-IOCO°C. The tests included mass change monitoring, and oxide scale analysis by X-ray diffraction studies.