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Microstructural investigations of pure nickel exposed to KCl induced high temperature corrosion

机译:暴露于KCl诱导的高温腐蚀的纯镍的显微组织研究

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Oxidation of 99.99% pure nickel was studied with and without 0.10 mg cm(-2) KCl(s) in an environment containing 5 vol.-% O-2, 40 vol.-% H2O and 55 vol.-% N-2 at 600 degrees C for up to 168 h. Oxide microstructure was investigated by X-ray diffraction (XRD), focused ion beam (FIB), broad ion beam (BIB) and SEM/ EDX. Oxidised nickel shows an approximately parabolic oxide growth rate. The oxide scale is dense with some pores at the oxide/metal interface. Adding small amounts of KCl does not result in a faster corrosion rate of nickel. However, the surface morphology changes and small oxide crusts were observed in the vicinity of former KCl particles. This is proposed to be the result of a NiCl2-KCl eutectic on top of the oxide scale formed above 514 degrees C. The oxide scale formed in the presence of KCl contains more and differently distributed voids than the scale formed without KCl.
机译:研究了在含5体积%O-2、40体积%H2O和55体积%N-2的环境中使用和不使用0.10 mg cm(-2)KCl的情况下99.99%纯镍的氧化在600摄氏度下长达168小时。通过X射线衍射(XRD),聚焦离子束(FIB),宽离子束(BIB)和SEM / EDX研究了氧化物的微观结构。氧化镍显示出近似抛物线氧化物的生长速率。氧化物垢是致密的,在氧化物/金属界面处有一些孔。添加少量的KCl不会导致镍的更快腐蚀速率。但是,在以前的氯化钾颗粒附近观察到了表面形态变化和小的氧化皮。提出这是由于在514摄氏度以上形成的氧化皮顶部形成NiCl2-KCl共晶的结果。与没有KCl形成的氧化皮相比,在存在KCl的情况下形成的氧化皮包含更多且分布不同的空隙。

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