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
材料科学技术（英）
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.
关键词:
niobium
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null
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