Chlorine-induced high temperature corrosion: Ii. The tedmon equation as a theoretical approach of the kinetics

Abstract

A model for the corrosion rate of metals and alloysinduced by the presence of chlorine is discussedokinetics are described by the Tedmon equationwhich describes simultaneous reactions, one leading to an increasein mass of specimens by solid state diffusion and vapour phase transport of the reactants obeying a parabolic rate equation and one resulting in a decrease ofmass due to scale evaporation, following a linear rate equation with rate constant kv. This model can only beused if the overall kinetics are determined by the diffusion ofions through the solid or molecules throughthe gas phase (pores) and not by the chemical reactionrate or gas phase transport through a diffusion boundary layer. © 1992, Walter de Gruyter. All rights reserved.