The corrosion behavior of T92, TP347HFG and IN625 in high-temperature CO₂ at 600 ℃ was investigated. Chromia-forming alloys TP347HFG and IN625 had better corrosion resistance than T92 because of insufficient Cr in T92 for forming Cr-rich oxide scales. More severe internal oxidation of T92 was found underneath the scratch due to the destroy of the Cr-rich oxide layer and the existence of Cr-depletion zone and induced plastic deformation by scratching. With the formation and growth of oxides at the surface of the scratch, the spallation of oxide scales may be caused by the compressive stress causing by scratching. Corrosion thermodynamic calculations were used to reveal the corrosion mechanism of T92, and the Cr–C–O phase diagrams were used to clarify the distribution of carbides.

研究了T92、TP347HFG和IN625在600℃高温CO ₂中的腐蚀行为。形成铬的合金TP347HFG 和IN625 比T92 具有更好的耐腐蚀性，因为T92 中的Cr 不足以形成富铬氧化皮。由于富铬氧化层的破坏和贫铬区的存在以及划痕引起的塑性变形，在划痕下方发现了更严重的T92内部氧化。随着划痕表面氧化物的形成和生长，氧化皮的剥落可能是由划痕产生的压应力引起的。腐蚀热力学计算用于揭示T92的腐蚀机理，并利用Cr-C-O相图来阐明碳化物的分布。