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| THE EFFECT OF YTTRIUM ON HIGH TEM PERATURE CORROSION BEHAVIOR OF Fe-Cr-Al ALLOYS IN PURE SO_2 GAS 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-5Al-0.5Y alloys in pure SO_2 atmosphere at 1200℃ was studied. The corrosion kinetics of these alloys was measured. X-ray diffraction was employed to identify the components in corrosion products. The morphologies of corrosion product surfaces, cross sections and fractures were examined by means of SEM, and the element distribution in corrosion product scales was also analyzed. The experimental results show that the alloys underwent pure oxidation without sulfidation observed in the experimental condition during the period of time of 300 hours. A duplex oxide scale was developed on the surface of the yttrium-free alloy while a single layer oxide scale was produced for the yttrium-containing alloy. The adhesion of the oxide scale was found to be remarkably improved by the addition of yttrium in the alloy. The beneficial effect of yttrium is discussed and attributed to the effective blocking of the bulk diffusion of Al~(3+)in the Al_2O_3 scale in the presence of yttrium.
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Received: 25 April 1992
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Cite this article:
Cao Tieliang; Pan Huiying; Dong Hehua and Zhang Yunshu ( Shanghai Institute of Metallurgy; Chinese Academy of Sciences). THE EFFECT OF YTTRIUM ON HIGH TEM PERATURE CORROSION BEHAVIOR OF Fe-Cr-Al ALLOYS IN PURE SO_2 GAS ATMOSPHERE. J Chin Soc Corr Pro, 1992, 12(2): 116-124.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1992/V12/I2/116
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[6] EI-Alat, M. M. and Kroger, F. A., ibid., 65, 280(1982) |
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