用石英弹簧热天平测定了Fe57Mo合金在1kPa硫压、700～900℃的硫蒸气中的硫化动力学曲线。结果表明，合金在700℃遵从抛物线规律，800℃和900℃下则表现为线性规律。合金硫化由其中Mo的硫化控制，其动力学常数比相应条件下的纯铁慢3～4个数量级，但仍比纯钼硫化快得多。硫化产物层的演变过程为：首先生成Fes，其次出现FeS＋MoS2双层结构，最终变为Fes＋MoS2＋FeMo6S8三层结构。综合动力学行为和硫化层分析，探讨了合金的硫化机理。 The vulcanization kinetics curves of Fe57Mo alloy in sulfur vapor at 1kPa and 700 ~ 900 ℃ were measured by quartz spring thermobalance. The results show that the alloy obeys the parabolic law at 700 ℃ and shows a linear rule at 800 ℃ and 900 ℃. The vulcanization of the alloy is controlled by the curing of Mo, and its kinetic constant is 3 to 4 orders of magnitude slower than pure iron under corresponding conditions, but still much faster than the pure molybdenum. The evolution of sulfidation product layer is as follows: First, Fes is generated, followed by a double-layer structure of FeS + MoS2 and finally into a three-layer structure of Fes + MoS2 + FeMo6S8. Comprehensive kinetic behavior and sulfide layer analysis, the vulcanization mechanism of the alloy was discussed.