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Effect of silicon on the oxidation resistance of 9% Cr steels

机译：硅对9％Cr钢抗氧化性的影响

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The oxidation resistance of 9% chromium steels, either with 0.5% Si or doped up to 4% Si, was studied at 600 and 950 degreesC under either 1 atm oxygen or Ar-H-2 mixture to elucidate the influence of silicon and oxygen pressure. Particular attention was paid to the initial stages of oxidation, using "in situ" monitoring of oxidation in an X-photoelectron spectroscopy (XPS) apparatus at 600 degreesC and under a low oxygen pressure. In 1 atm oxygen, the oxide film formed on the undoped steel mainly consists of iron oxides, while a chromia film grows on the steels containing 2-4% Si. In Ar-H-2/H2O, the scale on the undoped steel is heterogeneous and made up of both iron and chromium oxides while the pO(2) decrease has no significant influence on the Si-doped steels. During heating of the doped steels, silicon segregates at the outer surface and forms a thin SiO2 film. During further oxidation, the silica film only allows the formation of chromia (with Mn). Under the same conditions, no silicon segregation occurs on the surface of the undoped steel and iron oxides formed when oxygen is introduced. These results clearly demonstrate the beneficial influence of Si on the oxidation resistance of 9% Cr steels. (C) 2003 Elsevier Science B.V. All rights reserved. [References: 12]
机译：研究了9％铬钢（含0.5％Si或掺杂至4％Si）在600和950℃，1个大气压的氧气或Ar-H-2混合物下的抗氧化性，以阐明硅和氧气压力的影响。 。使用“原位”监测X光电子能谱（XPS）装置在600摄氏度和低氧气压力下的氧化过程，特别关注氧化的初始阶段。在1个大气压的氧气中，未掺杂钢上形成的氧化膜主要由氧化铁组成，而氧化铬膜则在含2-4％Si的钢上生长。在Ar-H-2 / H2O中，未掺杂钢的氧化皮是不均匀的，由氧化铁和氧化铬组成，而pO（2）的降低对掺Si的钢没有显着影响。在掺杂钢的加热过程中，硅在外表面偏析并形成SiO2薄膜。在进一步氧化期间，二氧化硅膜仅允许形成氧化铬（含Mn）。在相同条件下，在未掺杂的钢表面上不会发生硅偏析，并且在引入氧气时不会形成氧化铁。这些结果清楚地证明了Si对9％Cr钢的抗氧化性的有益影响。 （C）2003 Elsevier Science B.V.保留所有权利。 [参考：12]

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