Understanding preferential intergranular oxidation in alloy X-750 in 480 °C CO-CO2 environments at the nanoscale

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-10-01 DOI:10.1016/j.corsci.2024.112496

A.E. Yaedu , L. Volpe , A. Shaik , F. Long , K. Daub , F. Scenini , S.Y. Persaud

引用次数: 0

Abstract

Alloy X-750 was exposed to a 480 °C CO-CO₂ reducing gas mixture at an oxygen partial pressure below the NiO dissociation pressure. Post-exposure analytical transmission electron microscopy (ATEM) analysis confirmed the occurrence of preferential intergranular oxidation (PIO) and internal oxidation which resulted in the formation of Ni nodules. Thus, reducing CO-CO₂ mixtures can promote PIO in Alloy X-750, similar to Alloy 600 exposed to similar oxygen partial pressure but in H₂-steam environment. In Alloy X-750, intergranular oxidation of Ti and Al were observed to occur prior to Cr oxidation, while the presence of intergranular Cr carbides hinders PIO penetration depth.

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从纳米尺度了解合金 X-750 在 480 °C CO-CO2 环境中的优先晶间氧化作用

合金 X-750 暴露于 480 °C CO-CO2 还原气体混合物中，氧分压低于氧化镍解离压。暴露后的分析透射电子显微镜（ATEM）分析证实发生了优先晶间氧化（PIO）和内部氧化，从而形成了镍结核。因此，还原 CO-CO2 混合物可促进合金 X-750 中的 PIO，这与合金 600 暴露于类似氧分压但在 H2 蒸汽环境中的情况类似。在合金 X-750 中，观察到 Ti 和 Al 的晶间氧化发生在 Cr 氧化之前，而 Cr 晶间碳化物的存在阻碍了 PIO 的渗透深度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.