研究了纯Ｙ和Ｃｏ－Ｙ合金在８００℃Ｈ２－ＣＯ２混合气中的腐蚀，以检验添加Ｙ对纯Ｃｏ耐硫－氧混合气腐蚀中影响。给定温度下纯Ｙ的腐蚀膜具有保护性。并有助于降低纯Ｃｏ的腐蚀速率，１０＾０２Ｐａ硫压下，合金表面形成的腐蚀产物为多层、以为硫化钴，中间层为由两金属化合物怕成分复杂的混合物层，最内层是由氧和硫引起的Ｙ的内腐蚀区；在１０＾－３Ｐａ硫压下，合金没有形成外层硫钴，仅在表面形成较薄的Ｙ的硫氧化物，其下为Y的内氧化区。在Y含量较高条件下未发生Y的选择性外硫化/氧化，这与Y在基体金属中的有限固溶度以及合金中出现富Y的金属间化合物相有关。
The corrosion of pure yttrium and Gl5Y alloy was studied at 8OOC in H2-H2SCQmixtures providing an oxygen partial pressure of 10 -''Pa with sulfur partial pressure of 10 -2 Pa or 10 -Pa. The presence of yttrium is beneficial to reduce the corrasion rate of pure Co. The external scale of cobalt sulfide and yttrium oxide-surfide particles in the inner scale were found respectively after corrasion in Pa .!$ + lo-'' Pa Q. Beneath the external scale, a region of internal sulfidation-oxidation of yttrium was also present. The comion pduct in lo-' Pa .!$ + 10-l5 Pa Q was only a very thin surface layer of yttrium oxysulfide and an internal oxidation zone of yttrium. No yttrium depletion was observed in the alloy underneath the internal oxidation zone. ?he corrosion behavior of ;he alloy is thought to be related to the appearance of intermetallic compound and the limited solubility of yttrium in cobalt.
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