CORROSION OF Co-15wt%Ce ALLOY IN 10~(-8) ATM S_2 AT 600℃

J Chin Soc Corr Pro

1998, Vol. 18

Issue (2): 141-145 DOI:

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CORROSION OF Co-15wt%Ce ALLOY IN 10~(-8) ATM S_2 AT 600℃

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Abstract Corrosion behavior of Co-15wt%Ce alloy, pure Co and pure Ce was studied at 600℃ in atmosphere of H2-H2S with 10-8 atm of sulfur. It was shown that the alloy corroded more slowly than pure cobalt, but rather more rapidly than pure cerium. A scale of three layers developed on the alloy; the outmost layer of cobalt sulfide, the inner layer of cerium sulfied mixed with cobalt sulfide, and the innermost layer of cerium sulfide mixed with metallic cobalt. It seemed that the cerium content of 15wt% was not sufficient to prevent sulfidation of the metal cobalt, which might be owing to the limited solubility of cerium in the base metal and the presence of intermetallic compounds rich in cerium in the alloy.

Key words: Co-Ce alloy Sulfidation Corrosion

Received: 25 April 1998

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FU Guang-yan NIU Yan WU Wei-tao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)(Shenyang Institute of Chemical Technology). CORROSION OF Co-15wt%Ce ALLOY IN 10~(-8) ATM S_2 AT 600℃. J Chin Soc Corr Pro, 1998, 18(2): 141-145.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1998/V18/I2/141

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