SULFIDATION-OXIDATION OF Co-15wt% Y ALLOY IN H2-H2S-CO2 MIXTURES

J Chin Soc Corr Pro

1999, Vol. 19

Issue (6): 351-355 DOI:

Research Report

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SULFIDATION-OXIDATION OF Co-15wt% Y ALLOY IN H2-H2S-CO2 MIXTURES

Yuanshi Li;;;

大连理工大学材料系

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Abstract Corrosion of Co-15wt% Y alloy was studied in H2-H2S-CO2 mixtures with 10 -19Pa O2 at 600℃ or 10 -15Pa O2 at 700℃ and with 10 -3 Pa of sulfur pressure.The corrosion rates of the alloy were compared with those of pure cobalt and yttrium.The addition of yttrium to cobalt was only slightly beneficial.For yttrium content of 15wt%,the corrosion rate was reduced only to a limited extent at 600℃,and even slighly increased at 700℃ with respect to pure cobalt.The alloy formed extermal scales of cobalt sulfide containing yttrium sulfide-oxide particles in its inner part.Beneath the external scales,a region of internal sulfidation-oxidation of yttrium was also present.Thus,cobalt cold diffuse through intermediate regiion to form the outer cobalt sulfide layer at significant rates.The yttrium content in this alloy was still insufficient to form cobalt-free external scales.These results were interpretted by taking account of the limited solubility of yttrium in cobalt and the presence of intermetallic Co-Y compound in the alloy.

Key words: cobalt yttrium sulfidation-oxidation

Received: 04 January 1999

Corresponding Authors: Yuanshi Li

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Cite this article:

Yuanshi Li. SULFIDATION-OXIDATION OF Co-15wt% Y ALLOY IN H2-H2S-CO2 MIXTURES. J Chin Soc Corr Pro, 1999, 19(6): 351-355 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1999/V19/I6/351

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