Mechanism research on coupling effect between dew point corrosion and ash deposition

► Dew point corrosion and ash deposition tests of five materials were performed. ► Acid vapor condensed in the ash deposit rather than directly on the tube surface. ► Dew point corrosion resistance is as follow: 316L > ND > Corten>20G > 20# steel. ► Dew point corrosion mainly is oxygen corrosion under viscosity ash deposition.