The methods of scanning electron microscopy, energy dispersive analysis and x-ray diffractometry are used to study the kinetics and the mechanism of formation of complex-composition oxide scale on the surface of heat-resistant steel 25Cr18Ni9Si2 during oxidation at 900°C for 500 h. The composition of the scale and the proportion of the gain in the weight to the duration of the oxidation are determined. It is shown that the formation of the composite scale is connected with simultaneous oxidation and reduction of Si, Cr, Fe, and Ni accompanied by refinement of the oxide grains. It is inferred that the dense composite oxide scale is responsible for the high resistance of the steel to oxidation.

采用扫描电镜、能量色散分析和X射线衍射等方法，研究了耐热钢25Cr18Ni9Si2在900℃氧化500 h过程中，复合氧化物氧化皮形成的动力学和机理。 . 测定秤的组成和重量增加与氧化持续时间的比例。结果表明，复合氧化皮的形成与Si、Cr、Fe和Ni的同时氧化和还原以及氧化物晶粒的细化有关。据推测，致密的复合氧化物氧化皮是钢具有高抗氧化性的原因。