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研究了纯钇及合15％和30％（质量分数）Y的Fe－Y合金在硫分压为10－3Pa的H2－H2S混合气中于600—800℃的腐蚀行为．结果表明两种合金的腐蚀速率随着时间而降低，起始阶段后的腐蚀动力学曲线遵循抛物线规律．钇的加入显著降低Fe的腐蚀速率．在实验条件下纯钇形成Y3S3．在三个温度下，合金都形成了FeS外层，其下是含有FeS和Y2S3的混合中间层，而是由α─Fe和Y2S3的细微混合物组成的内硫化区，这是合金中的富Y相经短程扩散分解而成的．在合金／硫化膜的界面内侧没有观察到钇的贫化现象．从二元双相合金系的特征出发，讨论了所研究合金的腐蚀机制
The corrosion behavior of pure yttrium and Fe-Y alloy containing 15% Y and 30% Y (mass fraction) Y at 600-800 ℃ was investigated in H2-H2S mixture with partial pressure of 10-3Pa. The results show that the corrosion rate of the two alloys decreases with time, and the initial kinetic curve follows the parabolic law. The addition of yttrium significantly reduces the corrosion rate of Fe. Pure yttrium forms Y3S3 under experimental conditions. At all three temperatures, the alloys formed the outer layer of FeS, under which was the mixed intermediate layer containing FeS and Y2S3, but rather the inner vulcanized zone consisting of a fine mixture of alpha-Fe and Y2S3, which was the Y-rich Decomposed by short-range diffusion made of. No depletion of yttrium was observed inside the interface of the alloy / cured film. Based on the characteristics of binary dual-phase alloy system, the corrosion mechanism of the alloy under study is discussed