During biomass combustion alkali chloride particles are formed, depositing on the metallic surface or on the already formed oxide layer. Subsequently, they react with the metal or the oxide layer and accelerate the oxidation process. To investigate these reactions an equipment for the particles deposition by impactor and thermophoresis was installed and optimized for the homogenous deposition. After deposition of KCl, iron samples were exposed to N2-O2 and N2-O2-HCl atmospheres for short times at 300°C. In N2-O2, some deformation and local spreading of the particles were observed, probably by melt formation in contact with the metal. Oxidation with HCl addition led to a significant increase of chlorine and oxygen contents on the KCl deposited sample surfaces. In final, thermogravimetric tests were conducted on deposits formed on iron at temperatures from 300-400°C. In the case of HCl addition, mass gains increased rapidly in the beginning of oxidation. The iron chloride or chlorine rich layer were formed directly at the metal scale and under the oxide layer.

Subject
Salts, Metal surfaces, Oxide formation, Oxide layers, Iron, Mass gain, Oxide surfaces, Metals, Scale formation, Chlorine, Potassium chloride, Chlorides, Oxidation
Keywords:
alkali chloride, impactor, thermophoresis, biomass, kinetics
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2004
Association for Materials Protection and Performance (AMPP)
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