Abstract
The key corrosive media and coupling corrosion mechanism in waste incinerators were investigated. The presence of H2O(g) and the fluctuation of HCl/SO2 concentration significantly affect corrosion by affecting chemical reactions rather than molten phase formation·H2O(g) had higher adsorption energy (−40.67 kJ/mol) on NaCl (100) surface than O2 (−7.95 kJ/mol), generating more HCl than Cl2 and inhibiting corrosion. Oxidation of HCl was catalyzed by alkali salts in waste incineration ash, enhancing the production of Cl2 by 110% and accelerating corrosion. SO2 participated in the sulfidation of NaCl/KCl to form Cl2 and increased the corrosion weight gain by about 1–2.5 times.
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