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| MECHANISM ON CATASTROPHIC CORROSION OF Fe_3Al IN 1%SO_2+Ar AT 1000℃ |
| WANG Yong-gang HE Ye-dong ZHU Ri-zhang(University of Science and Technology Beijing; Beijing 100083) (Present address: P.O.Box 72; Northwestern Polytechnical University; Xi'an 710072) |
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Abstract Corrosion behavior and mechanism of Fe3Al in 1%SO2+Ar at 1000℃ were studied. It was shown that the alloy suffered catastrophic corrosion and orientated internal sulfidation although exhibiting quite good resistance to corrosion in the first 10-20min. Morphology, construction and composition of the scale on surface were investigated by SEM, EPMA and XRD. It was found that the upper scale formed in this atmosphere, which mainly consisted of FeS and Fe, had numerous defects. Mechanism of the catastrophic corrosion was discussed from the viewpoint of both thermodynamics and kinetics. It was proved that the main cause of the catastrophic corrosion occurrence was the formation of eutectic Fe-FeS by enrichment of Fe at base/scale and segregation of S through the scale full of defects .
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Received: 25 April 1998
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Cite this article:
WANG Yong-gang HE Ye-dong ZHU Ri-zhang(University of Science and Technology Beijing; Beijing 100083) (Present address: P.O.Box 72; Northwestern Polytechnical University; Xi'an 710072). MECHANISM ON CATASTROPHIC CORROSION OF Fe_3Al IN 1%SO_2+Ar AT 1000℃. J Chin Soc Corr Pro, 1998, 18(2): 146-150.
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I2/146
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