T91钢和TP304钢对含氯盐水蒸气的抗氧化性能

摘要

为比较T91钢与TP304钢在垃圾焚烧环境中的抗氧化性能,用含有微量KCl的水蒸气气氛模拟垃圾焚烧烟气,在530,600,670℃下对材料进行了氧化试验.结果表明:在含有微量KCl的高温水蒸气条件下,经过24 h后T91钢的氧化质量增加是TP304钢的5倍,表明TP304钢对于高温含Cl水蒸气的抗氧化能力优于T91钢的;在三种温度下氧化后,T91钢和TP304钢表面生成的片状氧化物成分与金属基体的Cr含量有关,Cr含量较低的T91钢表面生成了Fe2O3,Cr含量较高的TP304表面则生成了富含Cr的(Fe,Cr)2O3,(Fe,Cr)2O3氧化层的生成是TP304钢具有更高抗氧化性的原因.%To compare the oxidation resistance of T91 steel and TP304 steel in the environment of waste incineration,oxidation experiments were carried out at temperatures of 530,600,670 ℃ in a gas environment of waste incineration simulated by water vapor with a trace of KCl.The results show that the oxidation mass gain of T91 steel was 5 times as much as that of TP304 steel after oxidation for 24 h in high temperature water vapor with a trace of KCl,which indicated that TP304 steel performed higher high temperature oxidation resistance to water vapor with Cl than T91 steel.The composition of the flaky oxides formed on the surface of these two steels after oxidation was related to the content of Cr in the steels.Fe2O3 was formed on the surface of T91 steel while (Fe,Cr)2O3 at three temperatures was generated on the surface of Cr-richer TP304 steel.The formation of (Fe,Cr)2O3 oxide scale could be responsible for the higher oxidation resistance of TP304 steel compared to T91 steel in the environment of water vapor with chloride.