| Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃ |
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| 作者姓名： | F.Gesmundo F.Viani Y.NIU |
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| 作者单位： | Instituto di Chimica Facolta di lngegneria，Universita di Genova，Genova，16129，Italy，Instituto di Chimica，Facolta di lngegneria，Universita di Genova，Genova，16129，Italy，Corrosion Science Lab.，Institute of Corrosion and Protection of Metals，Academia Sinica，Shenyang，110015，China |
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| 摘 要： | The corrosion of alloys based on Fe,Co and Ni containing 15 and 30 wt-% Nb was studied at 700℃in H_2-H_2S mixtures providing 10~(-8) atm S_2.The Fe and Co-based alloys formed duplex scales withan outer layer of pure base-metal sulphide and an inner layer containing both metals.The Nb addi-tions were not able to produce exclusive Nb sulphidation but yielded a significant decrease of thecorrosion rates for both types of alloys with respect to the pure metals even though they were stillmuch higher than that of pure Nb.The Ni-base alloys corroded rapidly forming a single complexscale layer,mainly due to the appearance of a liquid Ni-S solution.
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| 收稿时间： | 1993-05-28 |
Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃ |
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| F.Gesmundo,F.Viani,Y.NIU.Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃[J].Journal of Materials Science & Technology,1993,9(3):167-171. |
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| Authors: | FGesmundo FViani Instituto di Chimica Facolta di Ingegneria Universita di Genova Genova ItalyYNIU Corrosion Science Lab |
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| Affiliation: | F.Gesmundo F.Viani Instituto di Chimica,Facolta di Ingegneria,Universita di Genova,Genova,,ItalyY.NIU Corrosion Science Lab.,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,,China |
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| Abstract: | The corrosion of alloys based on Fe,Co and Ni containing 15 and 30 wt-% Nb was studied at 700℃ in H_2-H_2S mixtures providing 10~(-8) atm S_2.The Fe and Co-based alloys formed duplex scales with an outer layer of pure base-metal sulphide and an inner layer containing both metals.The Nb addi- tions were not able to produce exclusive Nb sulphidation but yielded a significant decrease of the corrosion rates for both types of alloys with respect to the pure metals even though they were still much higher than that of pure Nb.The Ni-base alloys corroded rapidly forming a single complex scale layer,mainly due to the appearance of a liquid Ni-S solution. |
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| Keywords: | niobium alloys sulphidation high temperature |
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