Erosion-corrosion of metals in coal gasification atmospheres
High temperature erosion-corrosion (EC) in coal gasification atmospheres (CGA) presents unique demands on material performance. Extensive screening of many engineering alloys in unique EC test apparatus at IITRI has generated a broad data base. These data were analyzed to provide a cogent summary for applications and future research. The dependence of erosion-corrosion on alloy chemistry, environmental parameters including temperature, pressure, and gas composition, and erodent variables including velocity, particle size, hardness, and loading rate were evaluated. High resistance to corrosion did not assure good erosion-corrosion resistance. High chromium contents, in excess of 25 pct, was required to ensure good high temperature erosion-corrosion resistance in most alloys tested. However, the data show three alternatives offer the potential of reducing chromium requirements: substitution offerritics over austenitics, small additions of aluminum, and aluminizing. Metallurgical examination of selected specimens revealed that damage morphology varied greatly with the degree and extent of damage rate, and was sensitive to alloy composition, environmental conditions, and erodent loading. For example, alloy 6B exhibited mild brittle scale erosion at low erosion loading but suffered whole grain pullout due to preferential grain boundary sulfidation at high loading. Based on the data and analysis, a tentative model for high temperature EC was outlined and the implications for future testing were discussed.
KeywordsCoal Gasification Protective Scale Cobalt Sulfide Corrosion Penetration Coal Gasification Plant
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