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| HIGH TEMPERATURE CYCLIC OXIDATION BEHAVIOR OF Fe-Cr-Al ALLOYS IN PURE SO_2 ATMOSPHERE |
| Cao Tieliang; Pan Huiying; Dong Hehua and Zhang Yunshu(Shanghai Institute of Metallurgy; Chinese Academy of Sciences) |
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Abstract High temperature corrosion behavior of Fe-20Cr-5Al and Fe-20Cr-SAl-0.5Y alloys under thermal cycling condition was studied in pure SO2 atmosphere at 1200 ℃, aug compared to that exhibited under isothermal condition. The corrosion kinatics of the alloys were measured. The morphologies of surfaces, cross sections and fractures of the corrosion product were examined, the elemed distribution in the corrosion scales was analyzed, and the components of the corrosion products were also identified. The results show that the yttrium-free alloy was subject to oxidation/sulfidation attack at a linear rate. In contrast,the yttrium-containing alloy underwent pure oxidation at a parabolic rate without sulfidation in the duration of 500 hrs. The yttrium doping, as a donor, in α-Al2O3 is believed to effectively block the bulk diffusion of Al3+ in the oxide scale due to a decrease in the Ali concentration. As a result, the oxide scale growth would rely entirely upon the oxygen diffusion down through the oxide grain boundaries, thus leading to the development of a fine, edhesive columnar Al2O3 layer with superior cracking and spallation resistance, even under thermal cycling condition. Consequently, the cyclic oxidation resistance of the alloy is remarkably improved.
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Received: 25 April 1994
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Cite this article:
Cao Tieliang; Pan Huiying; Dong Hehua and Zhang Yunshu(Shanghai Institute of Metallurgy; Chinese Academy of Sciences). HIGH TEMPERATURE CYCLIC OXIDATION BEHAVIOR OF Fe-Cr-Al ALLOYS IN PURE SO_2 ATMOSPHERE. J Chin Soc Corr Pro, 1994, 14(2): 106-112.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1994/V14/I2/106
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| 1曹铁梁,潘辉英,董荷花,张允书．中国腐蚀与防护学报,1992,12:1162WoodGC,ScottFH．inHighTemperatureCorrosion,NACE-6,RappRA．ed．Houston:NACE,1983,p2773ButtBV,KvogerFA．J．Amer．Ceram．Soc,1975,58:4744EI-AlatMM．KroecrFA．Ibid．．1982．65:280 |
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