High temperature corrosion of boiler waterwalls induced by chlorides and bromides - Part 2: Lab-scale corrosion tests and thermodynamic equilibrium modeling of ash and gaseous species

► Forms of Br, Cl, Zn, Pb, S present in combustion gases and deposits were modeled. ► Cl and Br form mainly gaseous (1100 °C) and solid (400 °C) alkali metal halides. ► Relative corrosivity of bromine vs. chlorine containing deposits was estimated. ► ZnBr2-K2SO4 is more corrosive than ZnCl2-K2SO4 at lower temperatures.