This paper reports an experimental study of the oxidation–sulfidation behavior of T92 steel in a complex environment consisting of a combination of high temperature (700 °C), SO₂, molten sulfate salts, and applied stresses. The corrosion products, morphologies, and element distributions of corrosion scales were investigated in detail by SEM and XRD. Results indicate that the formation of sulfides in the deep layer where the p(O₂) is low-level prevents the reformation of a protective layer after the damage of the Cr₂O₃ layer. It is also noted that based on the data of maximum corrosion depth, when stresses are applied, the extent of corrosion had been alleviated, which is ascribed to that the applied stress also accelerated the fast formation of Cr₂O₃. However, the applied stress is also thought to accelerate the damage of the protective layer by inducing more boundaries of products and increasing the possibility of exfoliation of a corrosion scale. Thus, in the limited exposure duration to the corrosive environment in this study, there should be a “critical stress” under which the specimens present the best corrosion resistance.

本文报告了 T92 钢在由高温 (700 °C)、SO ₂、熔融硫酸盐和外加应力组成的复杂环境中氧化硫化行为的实验研究。通过SEM和XRD详细研究了腐蚀产物的腐蚀产物、形貌和元素分布。结果表明，在 p(O ₂ ) 低水平的深层中硫化物的形成阻止了 Cr ₂ O ₃损伤后保护层的重建层。还注意到，根据最大腐蚀深度的数据，当施加应力时，腐蚀程度有所减轻，这是由于施加的应力也加速了Cr ₂ O ₃的快速形成。然而，外加应力也被认为通过导致更多的产品边界和增加腐蚀鳞片剥落的可能性来加速保护层的损坏。因此，在本研究中有限的暴露于腐蚀环境的持续时间里，应该存在一个“临界应力”，在这个“临界应力”下，试样表现出最好的耐腐蚀性。