2.25CrMo钢在还原性含氯气氛中的高温腐蚀行为

HIGH TEMPERATURE CORROSION BEHAVIOR OF STEEL 2.25CrMo IN REDUCING ATMOSPHERE CONTAINING CHLORINE

采用热重法及SEM/EDX,XRD研究了2.25CrMo钢在500和 600℃下含氯还原性气氛中的腐蚀行为。结果表明,实验材料在两种温度下均发生了加速腐蚀,并且在外氧化膜/基体界面检测到了氯的存在。合金腐蚀动力学从500℃时的近似抛物线向600℃时的直线转变与氯化物在该温度下的蒸汽压有关.讨论了材料发生加速腐蚀的机制。

The corrosion behavior of steel 2.25CrMo was examined in reducing atmosphere at 500 degreesC and 600 degreesC by TG, SEM/EDX and XRD. The material suffers from accelerated corrosion at both temperatures, and chlorine can be detected at the scale/metal interface. The corrosion kinetics curves transform from parabolic at 500 degreesC to linear at 600 degreesC, which is relevant to vapor pressures of metal chlorides at the corresponding temperatures. The mechanism for the accelerated corrosion by chlorine is discussed.