Influence of Adhered Salt on High-temperature Corrosion in SO₂ Gas Atmosphere

Abstract

In order to investigate the influence of salts including biomass fuels on high-temperature corrosion process, we have tested in sulfur dioxide gas atmosphere where chlorine gas concentration and salt ratio in ash is changed. The corrosion mass loss increased rapidly when the salt ratio in ash increased more than 50 wt.％ with chlorine gas in sulfur dioxide gas atmosphere. These results indicate that the highly corrosive iron chloride is generated by dissolved chlorine gas from the gas phase and iron ion from steel in molten salt.