Corrosion characteristics of Fe, Ni and Ti based alloys near the critical point of water and during supercritical water gasification and oxidation of municipal sludge

IF 3.4 3区工程技术 Q2 CHEMISTRY, PHYSICAL

Journal of Supercritical Fluids Pub Date : 2024-06-20 DOI:10.1016/j.supflu.2024.106337

Lili Qian , Wenyu Ma , Dan Fang , Yanmeng Gong , Weijing Liu , Shuang Wang , Shuzhong Wang

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Abstract

Supercritical water gasification (SCWG) and oxidation (SCWO) were promising technologies for treating municipal sludge; however, corrosion hindered their development. To obtain the candidate material for preheaters, corrosion characteristics of 316, 316 L, Incoloy 800, 825, and TA-10 were investigated at 350 °C and 400 °C. For SCWG and SCWO reactors, corrosion behaviors of 316, Incoloy 800, 825, Inconel 600, 625, and Hastelloy C276 were explored at 450 °C and 520 °C, with and without oxidants. Near the critical point of water, corrosion rates of all materials were below 0.4 mm·a⁻¹, with 316 L being the candidate material. According to the pH variation, materials underwent activation (350 °C) and passivation (400 °C) pathways. During SCWG and SCWO, Incoloy 825 and Inconel 625 were prioritized at 450 ℃ and 520 ℃, exhibiting corrosion rates below 0.40 mm·a⁻¹ and 0.50 mm·a⁻¹, respectively. Chemical corrosion dominated and double-layer oxide films (Fe₃O₄-FeCr₂O₄ and NiO-Cr₂O₃) formed.

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铁、镍和钛基合金在水临界点附近以及在超临界水气化和城市污泥氧化过程中的腐蚀特性

超临界水气化（SCWG）和氧化（SCWO）是处理市政污泥的有前途的技术，但腐蚀问题阻碍了它们的发展。为了获得预热器的候选材料，研究了 316、316 L、Incoloy 800、825 和 TA-10 在 350 °C 和 400 °C 下的腐蚀特性。对于 SCWG 和 SCWO 反应器，在 450 ℃ 和 520 ℃（含氧化剂和不含氧化剂）条件下研究了 316、Incoloy 800、825、Inconel 600、625 和哈氏合金 C276 的腐蚀行为。在接近水的临界点时，所有材料的腐蚀速率都低于 0.4 mm-a，其中 316 L 是候选材料。根据 pH 值的变化，材料经历了活化（350 °C）和钝化（400 °C）过程。在 SCWG 和 SCWO 过程中，Incoloy 825 和 Inconel 625 在 450 ℃ 和 520 ℃ 下被优先考虑，它们的腐蚀速率分别低于 0.40 mm-a 和 0.50 mm-a。化学腐蚀占主导地位，并形成了双层氧化膜（FeO-FeCrO 和 NiO-CrO）。

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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.