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首页> 外文期刊>Applied Surface Science >Surface chemistry and corrosion behavior of Inconel 625 and 718 in subcritical, supercritical, and ultrasupercritical water
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Surface chemistry and corrosion behavior of Inconel 625 and 718 in subcritical, supercritical, and ultrasupercritical water

机译：Inconel 625和718在亚临界，超临界和超超临界水中的表面化学性质和腐蚀行为

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摘要

Corrosion behavior of Inconel 625 and 718 in subcritical, supercritical and ultrasupercritical water was studied as a function of temperature and time. The change in the chemistry of the as-received surface film on Inconel 625 and 718 after exposure to subcritical water at 325 degrees C and supercritical water at 425 degrees C and 527.5 degrees C for 2 h was studied. After exposure to 325 degrees C subcritical water, the CrO42- based film formed; however minor quantities of NiFexCr2-xO4 spinel compounds were observed. The oxide film formed on both alloys when exposed to supercritical water at 425 degrees C consisted of NiFexCr2-xO4 spinel. The surface films on both alloys were identified as NiFe2O4 when exposed to supercritical water at 527.5 degrees C. To characterize the fully developed oxide layer, studies were conducted at test solution temperatures of 527.5 and 600 degrees C. Samples were exposed to these temperatures for 24, 96, and 200 h. Surface chemistry was analyzed using X-ray diffraction, as well as Raman and X-ray photoelectron spectroscopies. Inconel 718 exhibited greater mass gain than Inconel 625 for all temperatures and exposure times. The differences in corrosion behavior of the two alloys are attributed to the lower content of chromium and increased iron content of Inconel 718 as compared to Inconel 625. (C) 2017 Elsevier B.V. All rights reserved.
机译：研究了Inconel 625和718在亚临界，超临界和超超临界水中的腐蚀行为随温度和时间的变化。研究了Inconel 625和718上原样的表面膜在325℃的亚临界水和425℃和527.5℃的超临界水暴露2小时后化学变化的变化。暴露于325°C的亚临界水中后，形成了CrO42基膜。但是观察到少量的NiFexCr2-xO4尖晶石化合物。当暴露于425摄氏度的超临界水中时，两种合金上形成的氧化膜由NiFexCr2-xO4尖晶石组成。当暴露于527.5摄氏度的超临界水中时，两种合金的表面膜均被鉴定为NiFe2O4。为表征完全显影的氧化层，在527.5和600摄氏度的测试溶液温度下进行了研究。样品在这些温度下暴露24 ，96和200小时。使用X射线衍射以及拉曼光谱和X射线光电子能谱分析了表面化学。在所有温度和暴露时间下，Inconel 718的质量增益均高于Inconel 625。两种合金在腐蚀行为上的差异归因于与Inconel 625相比，Inconel 718的铬含量更低，铁含量更高。（C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第may15期|443-451|共9页
  • 作者

    Rodriguez David; Merwin Augustus; Karmiol Zachary; Chidambaram Dev;

  • 作者单位

    Univ Nevada, Mat Sci & Engn, 1664 N Virginia St Reno,MS 0388, Reno, NV 89557 USA;

    Univ Nevada, Mat Sci & Engn, 1664 N Virginia St Reno,MS 0388, Reno, NV 89557 USA;

    Univ Nevada, Mat Sci & Engn, 1664 N Virginia St Reno,MS 0388, Reno, NV 89557 USA;

    Univ Nevada, Mat Sci & Engn, 1664 N Virginia St Reno,MS 0388, Reno, NV 89557 USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Supercritical; Spinel; XRD; Raman; XPS;

    机译：超临界;Spinel;XRD;拉曼;XPS;

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