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Hot corrosion behavior of Ni based Inconel 617 and Inconel 738 superalloys

机译:镍基Inconel 617和Inconel 738高温合金的热腐蚀行为

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Superalloys are extensively used at high temperature applications due to their good oxidation and corrosion resistance properties in addition to their high stability were made at high temperature. Experimental measurements of hot corrosion at high temperature of Inconel 617 and Inconel 738 superalloys. The experiments were carried out at temperatures 700 degrees C, 800 degrees C and 900 degrees C for different exposure times to up to 100 h. The corrosive media was NaCl and Na2SO4 sprayed on the specimens. Seven different specimens were used at each temperature. The corrosion process is endothermic and the spontaneity increased by increasing temperature. The activation energy was found to be Ea = 23.54 and E-a = 25.18 Kj/mol for Inconel 738 and Inconel 617 respectively. X-ray diffraction technique (XRD) was used to analyze the formed scale. The morphology of the specimen and scale were examined by scanning electron microscopy (SEM). The results show that the major corrosion products formed were NiCr2O4, and Co Cr2O4 spinles, in addition to Cr2O3. (C) 2016 Elsevier B.V. All rights reserved.
机译:高温合金除了在高温下具有很高的稳定性外,还具有良好的抗氧化和耐腐蚀性能,因而被广泛用于高温应用。 Inconel 617和Inconel 738高温合金高温下热腐蚀的实验测量。实验是在700摄氏度,800摄氏度和900摄氏度的温度下进行的,暴露时间长达100小时。腐蚀性介质为喷洒在样品上的NaCl和Na2SO4。在每个温度下使用七个不同的样本。腐蚀过程是吸热的,自发性随温度升高而增加。发现Inconel 738和Inconel 617的活化能分别为Ea = 23.54和E-a = 25.18 Kj / mol。使用X射线衍射技术(XRD)分析形成的水垢。通过扫描电子显微镜(SEM)检查样品的形态和鳞片。结果表明,除Cr2O3外,形成的主要腐蚀产物为NiCr2O4和Co Cr2O4尖晶石。 (C)2016 Elsevier B.V.保留所有权利。

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