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Abstract High temperature corrosion behavior of Fe-A1 ,Fe-Cr alloys was studied in SO_2 gaseous environment at 800,900 and 950℃.The corrosion kinetics of the alloys was determined by monitoring weight changes of alloy specimens with a quartz spring .The corrosion product was exa- mined by means of SEM,EMP and X-ray diffraction. For Fe-Al and Fe-Cr alloys tested in this study the materials were subjected to simultaneous sulfidation/oxidation at the early stage of corrosion with a rapid diffusion path for metal ions along sulfides formed.At.the later stage the inerease in corrosion product scale thick- nces was sololy due to growth of iron oxides on the scale surface .At the some time,SO_2 molecules transport inward through the corrosion product scale,thus inducing internal sulfidation/oxidation of the ma- terials.
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Received: 25 August 1990
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[1] Stroosnijder,M.F.,and Quadakker,W.J.,High Temperature Tecnnology.,4,83(1986)
[2] Stroosnijder,M.F.,and Quadakker,W.J.,ibid.,4,14(1986)
[3] Chatterjee,B.,Dowell A.J.,Corro Sci,,15,639 (1975)
[4] Holthe,K.,and Kofstad,P.,ibid.,20,919 (1980)
[5] Wootton,M.R.,and Birks,N.,ibid.,12,829 (1972)
[6] Wootton,M.R.,and Birks,N.,ibid.,15,(1975)
[7] Asundis,C.,Gesmundo,F.,and Bottino,C.,Oxid Met.,14,15(1980)
[8] Flatley,T.,and Birks,N.,JISI.,209,523 (1971) |
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