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| AN INVESTIGATION OF THE OXIDATION AND HOT CORROSION OF A 3SNi-15Cr TYPE IRON-BASE ALLOY |
| Guo Jianting Institute of Metal Research; Academia Sinica |
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Cite this article:
Guo Jianting Institute of Metal Research; Academia Sinica. AN INVESTIGATION OF THE OXIDATION AND HOT CORROSION OF A 3SNi-15Cr TYPE IRON-BASE ALLOY. Acta Metall Sin, 1979, 15(2): 203-305.
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Abstract The oxidation behaviour of a 35Ni-15Cr type iron-base superalloy in air overthe temperature range of 700 to 1000℃ for period up to 200 hours has beenstudied. The results obeyed the conventional parabolic law from which the valuesof activation energy Q_(P1)=41 and Q_(P2)=46 kcal per mole were estimated. The dif-fusion of Cr ions in Cr_2O_3 was obviously the governing factor to oxidation rateand X-ray analysis indicated that the surface scale consisted mainly of Cr_2O_3 witha certain amount of (Cr,Fe)_2O_3, TiO_2 and NiCr_2O_4. The results were confirmedby electron probe, showing surface enrichment of Cr, Fe and Ti. The scale wasdense and tightly adhered to the surface of the oxidized specimen. If such an alloywas previously alumited, its oxidation-resisting and anti-corrosion properties weremarkedly improved and the scale, being enriched with Al, Cr and Ti, now con-sisted mainly of α-Al_2O_3 with minute Fe(Cr,Al)_2O_4 and TiO_2. With alumiting,the scale was more dense and more tightly adhered to surface than without alumiting.
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Received: 18 February 1979
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