Insights into oxidation and nitridation of alumina-forming FeCrAl alloy after supercritical water exposure: Effect of pre-corrosion on high-temperature damage behavior

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2023-10-01 DOI:10.1016/j.supflu.2023.106007

Guanyu Jiang, Donghai Xu, Huanteng Liu, Bing He, Lu Liu, Yanhui Li, Jianqiao Yang

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引用次数: 1

Abstract

This work investigated the corrosion characteristics of FeCrAl alloy in supercritical water (SCW), and focused on the effect of SCW pre-corrosion on the alloy oxidation and nitridation at 900 °C. FeCrAl alloy formed outer Fe-rich oxides (mainly Fe₂O₃) and inner Fe-Cr-Al oxides during SCW exposure. SCW pre-corrosion made FeCrAl alloy exhibit different morphologies and phase compositions in the same medium. SCW pre-corrosion promoted the deposition of Ni and Mo elements from the autoclave, filling the gaps in flaky oxides by forming Ni- and/or Mo-rich products in air and N₂. Moreover, SCW pre-corrosion avoided the appearance of accelerated nitridation zones in N₂. However, pre-corrosion caused the preferential diffusion of N₂ and air. Outward-diffused Cr ions during SCW exposure reacted with O impurities in N₂ to form Cr₂O₃ that easily dissociated N₂, leading to the development of nitridation towards the alloy interior.

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超临界水暴露后铝形成的FeCrAl合金的氧化和氮化:预腐蚀对高温损伤行为的影响

研究了FeCrAl合金在超临界水中的腐蚀特性，重点研究了超临界水预腐蚀对合金在900°C下氧化氮化的影响。在SCW暴露过程中，FeCrAl合金形成了外部富铁氧化物（主要是Fe2O3）和内部Fe-Cr-Al氧化物。SCW预腐蚀使FeCrAl合金在同一介质中表现出不同的形貌和相组成。SCW预腐蚀促进了Ni和Mo元素从高压釜中的沉积，通过在空气和N2中形成富含Ni和/或Mo的产物来填充片状氧化物中的间隙。此外，SCW预腐蚀避免了N2中加速氮化区的出现。然而，预腐蚀导致N2和空气的优先扩散。SCW暴露过程中向外扩散的Cr离子与N2中的O杂质反应形成Cr2O3，Cr2O3容易离解N2，导致向合金内部氮化。

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来源期刊

Journal of Supercritical Fluids 工程技术-工程：化工

CiteScore

7.60

自引率

10.30%

发文量

236

审稿时长

56 days

期刊介绍： The Journal of Supercritical Fluids is an international journal devoted to the fundamental and applied aspects of supercritical fluids and processes. Its aim is to provide a focused platform for academic and industrial researchers to report their findings and to have ready access to the advances in this rapidly growing field. Its coverage is multidisciplinary and includes both basic and applied topics. Thermodynamics and phase equilibria, reaction kinetics and rate processes, thermal and transport properties, and all topics related to processing such as separations (extraction, fractionation, purification, chromatography) nucleation and impregnation are within the scope. Accounts of specific engineering applications such as those encountered in food, fuel, natural products, minerals, pharmaceuticals and polymer industries are included. Topics related to high pressure equipment design, analytical techniques, sensors, and process control methodologies are also within the scope of the journal.