Corrosion tests of T91 were carried out in the stagnant lead–bismuth eutectic (LBE) containing 10⁻⁶, 10⁻⁷, and 10⁻⁸ wt% oxygen at 500°C for up to 2000 h, respectively. The dependence of corrosion characteristics on oxygen concentrations in LBE was obtained. The results show that the oxide-scale structure changes from a three-layer magnetite/spinel/internal oxidation zone (IOZ) scale under the oxygen concentration of 10⁻⁶ wt%, to the formation of a two-layer spinel/IOZ scale under the oxygen concentrations of 10⁻⁷ and 10⁻⁸ wt%. In addition, with the decrease of the oxygen concentration, the Cr/Fe ratio in the Fe–Cr spinel slightly increases in a linear rule while the thicknesses of the oxide layers gradually decrease.

中文翻译：

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T91钢在500℃不同氧浓度铅铋共晶腐蚀特性

T91 的腐蚀测试分别在含有 10 ^-6、10 ^-7和 10 ^-8  wt% 氧的停滞铅铋共晶 (LBE) 中进行，时间分别为 2000 小时。获得了腐蚀特性对 LBE 中氧浓度的依赖性。结果表明，在氧浓度为 10 ^-6  wt% 时，氧化皮结构从三层磁铁矿/尖晶石/内部氧化带 (IOZ) 氧化皮转变为在氧浓度为 10 ^-6 wt% 时形成的两层尖晶石/IOZ 氧化皮。 10 ^-7和 10 ^-8的氧浓度 重量％。此外，随着氧浓度的降低，Fe-Cr 尖晶石中的 Cr/Fe 比值呈线性增加，而氧化层的厚度逐渐减小。