Oxidation behavior of 316L stainless steel in supercritical water

IF 4.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2025-07-23 DOI:10.1016/j.supflu.2025.106728

Wenxin Ren , Lu Ren , Mengmeng Liang , Jianxing Zhou , Xiaohui Zhang , Z. Li

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引用次数: 0

Abstract

Supercritical water oxidation technology has been extensively employed in organics treatment, significantly enhancing energy utilization and recovery efficiency. However, due to its extreme corrosiveness, supercritical water systems impose stringent requirements on the material properties. This study investigates the oxidation behavior of 316 L stainless steel in supercritical water at 798 K and 24 MPa for 200 h. Results indicate that the average weight gain of the specimens was 1.73 g/m² after 200 h. A discrete monolayer oxide film forms on its surface, accompanied by noticeable pitting corrosion. The oxide layer is primarily composed of Fe oxides, with some Cr oxides present. A significant amount of oxides is also found around the pits, which is mainly composed of Fe and Ni oxides, and the presence of NiFe₂O₄ spinel is detected as well. This study further explores the oxidation mechanism of 316L stainless steel in supercritical water, to provide novel perspectives and insights into the selection of materials for supercritical water systems, thereby extending the service life of the equipment.

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316L不锈钢在超临界水中的氧化行为

超临界水氧化技术在有机物处理中得到了广泛应用，显著提高了能量利用率和回收效率。然而，由于其极强的腐蚀性，超临界水系统对材料性能提出了严格的要求。研究了316 L不锈钢在798 K、24 MPa、200 h的超临界水中的氧化行为。结果表明，在200 h后，平均增重1.73 g/m2。在其表面形成离散的单层氧化膜，并伴有明显的点蚀。氧化层主要由铁氧化物组成，还有一些铬氧化物。在坑周还发现了大量的氧化物，主要由Fe和Ni氧化物组成，同时还检测到NiFe2O4尖晶石的存在。本研究进一步探讨了316L不锈钢在超临界水中的氧化机理，为超临界水系统材料的选择提供了新的视角和见解，从而延长设备的使用寿命。

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

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.