Hot corrosion of alloy 617 OCC in simulated coal ash environment encountered in USC power plants
| Autor: | M. Nageswara Rao, A.H.V. Pavan, P. R. Hari, N. Arivazhagan |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Metallurgy Alloy technology industry and agriculture Thermal power station chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Alkali metal complex mixtures 01 natural sciences Corrosion chemistry Aluminium Fly ash 0103 physical sciences engineering Chromium oxide 0210 nano-technology Layer (electronics) |
| Zdroj: | Materials Today: Proceedings. 44:4439-4444 |
| ISSN: | 2214-7853 |
| DOI: | 10.1016/j.matpr.2020.10.599 |
| Popis: | Hot corrosion of Alloy 617 OCC was studied in a simulated coal ash environment at 700 °C. A synthetic mixture of sulphates of alkali metals Na and K and oxides of Al, Si and Fe was used to simulate the coal ash environment developing in advanced thermal power plants. Studies extended up to 5000 h of exposure time, comprising of 10 cycles each of 500 h duration. Progress of the corrosion process was monitored using XRD and SEM-EDAX analysis of surface and transverse sections. An incubation period of about 1500 h was observed, characterised by formation of a single protective layer of chromium oxide, with little or no corrosion damage occurring. Longer exposure times saw formation of a second layer, comprising of oxides of Co, Ni, Fe etc, bringing in significant corrosion. Aluminum and Ti were found to be internally oxidised. The manuscript elaborates on these findings. |
| Databáze: | OpenAIRE |
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