Arc-Sprayed Iron-Based Coatings for Erosion-Corrosion Protection of Boiler Tubes at Elevated Temperatures
| Autor: | Volodymyr Gvozdeckii, Vasyl Pokhmurskii, Bernhard Wielage, Mykhailo Student, Hanna Pokhmurska, Oleksandra Student, Taras Stypnutskyy |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Journal of Thermal Spray Technology. 22:808-819 |
| ISSN: | 1544-1016 1059-9630 |
| DOI: | 10.1007/s11666-013-9921-z |
| Popis: | Wire arc spraying is an economically attractive thermal spray process that is especially interesting for the protection of large-scale parts or constructions. This study presents the results of the development and investigation of a number of cored wires based on the Fe-Cr-Al system with minor addition of alloying elements (B, Mn, Ni, Si, Ti, Mg, etc.). The microstructure of the coatings, their electrochemical behavior, and isothermal oxidation performance over a temperature range of 20-700 °C were investigated. Erosion resistance at elevated temperatures was determined with a laboratory test unit under test conditions that have simulated the work conditions in fossil-fuel-fired boilers. It was established that the oxidation resistance and the gas-abrasive wear resistance of arc-sprayed coatings depend mostly on the coating microstructure and homogeneity of element distribution rather than on the general alloying level and microhardness of the coating. A new parameter for coating characterization, namely, the coefficient of chemical microheterogeneity, K CMH, is introduced to quantify this influence. Formation of the coating microstructure at elevated temperatures and its influence on the protection ability of the coating are discussed. |
| Databáze: | OpenAIRE |
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