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研究比较了Fe-13Cr-x Mn(x=0.5,1,2)系列合金在干燥和湿润空气中800℃下的氧化行为。结果表明,在干燥气氛中合金表现出良好的抗氧化性能,当Mn含量低于1%时有助于合金表面生成阻碍Cr挥发的(Mn,Cr)3O4尖晶石相;而当Mn含量达到2%,合金表面则会产生Mn2O3,从而影响合金的抗高温氧化性能。在含水蒸气气氛中,合金发生了失稳态氧化,表面生成了大量氧化物,合金的氧化速率随Mn含量的增大而减小,主要原因是Mn含量增加导致膜层中形成(Mn,Cr)3O4尖晶石相,从而有效阻碍了水气环境中Cr的挥发,尤其Fe-13Cr-2Mn合金在氧化初期12 h内并没有发生加速腐蚀,Fe-Cr-Mn合金的加速氧化是由表面氧化铬膜与水蒸气发生反应所致。通过SEM,XRD等分析手段深入探讨了合金加速氧化机制以及Mn效应。
The oxidation behavior of Fe-13Cr-xMn (x = 0.5,1,2) series alloys at 800 ℃ in dry and humid air was compared. The results show that the alloy exhibits good oxidation resistance under dry atmosphere. When the content of Mn is less than 1%, the (Mn, Cr) 3O4 spinel phase which inhibits Cr volatilization is formed on the surface of the alloy. When the content of Mn reaches 2%, the alloy surface will produce Mn2O3, thus affecting the alloy’s high temperature oxidation resistance. In the steam-containing atmosphere, the alloy undergoes a steady-state oxidation and a large amount of oxide is formed on the surface. The oxidation rate of the alloy decreases with the increase of Mn content, which is mainly due to the formation of Mn in the film ) 3O4 spinel phase, which effectively hinder the volatilization of Cr in the water and gas environment, especially Fe-13Cr-2Mn alloy within 12 h of initial oxidation did not occur accelerated corrosion, accelerated oxidation of Fe-Cr-Mn alloys by the surface Chromium oxide film and water vapor reaction caused. The mechanisms of accelerating oxidation and the Mn effect were investigated in depth by means of SEM and XRD.