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| HIGH TEMPERATURE CORROSION OF MILD STEEL IN BLAST FURNACE EXHAUST GAS CONTAINING HF |
| CHIN TA-K'ANG; SHN PANG-JU; HUANG YUNG-SHU; (Institute oF Metallurgy; Academia Sinica) |
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Cite this article:
CHIN TA-K'ANG; SHN PANG-JU; HUANG YUNG-SHU; (Institute oF Metallurgy; Academia Sinica). HIGH TEMPERATURE CORROSION OF MILD STEEL IN BLAST FURNACE EXHAUST GAS CONTAINING HF. Acta Metall Sin, 1966, 9(1): 90-97.
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Abstract Mild steel specimens were exposed to synthetic blast furnace exhaust gases of the following composition: HF 0.05—5%, H_2 1.5—2.5%, H_2O 0—1%, CO_2 6—8%, CO 19—23%, N_2—hal., at a temperature range of 250° to 530℃. Below ～390℃, the corrosion product was identified by X-ray diffraction as FeF_2 and formed a compact protective film. It was further observed that the existence of H_2 in synthetic gases greatly retards the formation of FeF_2. Above ～390℃, FeF_2 first formed is transformed immediately into Fe_3O_4 by the reaction with the existing water vapor. Even in a dry synthetic gas under this temperature range, the reaction of CO_2 and H_2 will produce sufficient partial pressure of water vapor to drive this transformation to its completeness. These results conform with the existing thermodynamic data. On increasing the HF concentration from 0.05% to 5%, no obvious enhancement of corrosion rate of mild steel has ever been noted below 390℃.
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Received: 18 January 1966
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[1] #12
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