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| HOT CORROSION OF Ni-Cr,Ni-Cr-Al-Ti AND Ni-Cr-Al-Ti-Ce ALLOYS |
| Xu Fengqin Fan Zhiyong Wang Yijue Zang Gaidi (Central Iron and Steel Research Institute;MMI) |
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Abstract The weight changes due to hot corrosion of Ni-Cr(Cr 15～25),Ni-Cr-Al- Ti (Cr 15～25,Al 2～4,Ti 2～4),and Ni-Cr-Al-Ti-Ce(Ce0.07-0.39)systems have been determined at 900℃ in both pure Na_2SO_4 and 75% Na_2SO_4-25% NaCl salt bath.It has been established that the hot corrosion degradation of Ni-Cr alloys was more evident in the salt mixture than in pure Na_2SO_4.The hot corrosion behaviour of Ni-Cr-Al-Ti alloys was superior to that of the binary Ni-Cr alloys in the salt mixture.However similar results were not obtained in pure Na_2SO_4 salt.The beneficial effect of adding Ce to the Ni-Cr- Al-Ti alloys was significant in pure Na_2SO_4 but not in Na_2SO_4+NaCl salt mixture.
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Received: 25 February 1985
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[1] Hurst,R.C.;Johnson,J.B.;Davies,M.;Hancock,P.,Deposition and Corrosion in Gas Turbines,Ed Hart,A.B.;Cutler,A.J.B.,London,143(1973)
[2] Hancock,P.,Proceedings of the 1974 Gas Turbine Materials in the Marine Environment Conference,July 225(1974)
[3] Jones,R.L.;Fairbanks,J.W.,idem,P219
[4] Conde,J.F.,AD-AO16,684,Proceedings of Gas Turbine Materials 1972 Conference Held at the Naval Ship Engineering Center,Hyattsville,Maryland,in October 17(1972) |
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