研究了含15wt％Ce的Co-15Ce合金及纯Ce、纯Co在600℃、H_2-H_2S中的腐蚀行为,介质的硫分压为10~(-8)atm。结果表明,Co-15Ce合金的腐蚀速度比纯Co慢得多,但高于纯Ce。Co-15Ce合金腐蚀后形成复杂的腐蚀产物膜,最外层为纯Co的硫化物层,其下为Ce的硫化物与Co的硫化物的混合物层,内层为Ce的硫化物与金属Co的混合物。15％Ce不足以阻止基体金属Co的硫化腐蚀,这可能与Ce在Co中有限的溶解度及富Ce第二相的出现有关。
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.
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