The corrosion weight method was adopted to investigate the corrosion characteristics of G20

the common material for superheaters in low parameter CFB boilers in tube furnace under simulated flue gas condition

with different HCl concentrations(from 0.1%to 0.2%)and temperatures(from 500℃to 600℃).Metal specimens after corrosion tests were analyzed by SEMEDS and XRD to detect the appearance and composition of corrosion products.Moreover

kinetic analysis was also conducted.The results showed that

with an increase in the reaction temperature and HCl concentration

the anti-corrosion performance of 20Gdecreased generally.The corrosion film on metal surface showed a layered structure;the content of Cl decreased from inside to outside

and the outside layer mainly consisted of Fe2O3and a small amount of Fe3O4.The corrosion products took on a needle-like structure at 0.1% HCl concentration and this shape became bigger when the temperature increased.Therefore

at temperature of 600℃

and with the HCl concentration larger than 0.2%

20Gis not suitable for erosion resistant.