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Corrosion Behavior of Fe-Cr Alloys in Ar-10O_2 Atmosphere

机译:Fe-Cr合金在Ar-10%O_2气氛中的腐蚀行为

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The corrosion of four Fe-Cr alloys (Cr: 9,12, 20, and 25%) with different Cr contents were subjected to cyclic oxidation fiirnace in Ar-10%O_2 atmosphere at 950℃ for 120 h. The samples after oxidation were investigated by using X-ray diffraction (XRD), optical metallography and SEM/EDS. The results indicated that increasing Cr content reduced the oxidation rate and the scale cracking. Alloys with less Cr content occurred breakaway oxidation due to formation of Fe-rich oxide scale. However, a thin protective chromia scale was observed on alloys with Cr > 20%. The corrosion behaviour on Fe-Cr alloy was then discussed based on experimental observation.
机译:对四种不同Cr含量的Fe-Cr合金(Cr:9、12、20和25%)的腐蚀在950℃的Ar-10%O_2气氛中进行了120 h的循环氧化反应。氧化后的样品通过X射线衍射(XRD),光学金相和SEM / EDS研究。结果表明,Cr含量的增加降低了氧化速率和氧化皮开裂。 Cr含量较低的合金由于形成富铁氧化物垢而发生分裂氧化。但是,在Cr> 20%的合金上观察到较薄的保护性氧化铬垢。然后根据实验观察结果讨论了铁铬合金的腐蚀行为。

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