Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃

Abstract

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.

Key words: niobium, alloys, sulphidation, high temperature

F.Gesmundo F.Viani Instituto di Chimica,Facolta di Ingegneria,Universita di Genova,Genova,16129,ItalyY.NIU Corrosion Science Lab.,Institute of Corrosion and Protection of Metals,Academia Sinica,Shenyang,110015,China. Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃[J]. J Mater Sci Technol, 1993, 9(3): 167-171.

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Sulphidation of Fe-Nb,Co-Nb and Ni-Nb Alloys in H_2-H_2S at 700℃

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