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, 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 and 0.50 mm·a, respectively. Chemical corrosion dominated and double-layer oxide films (FeO-FeCrO and NiO-CrO) formed.

中文翻译：

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Fe、Ni、Ti基合金在水临界点附近及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）是处理城市污泥的有前景的技术；然而，腐蚀阻碍了它们的发展。为了获得预热器的候选材料，在 350 °C 和 400 °C 下研究了 316、316 L、Incoloy 800、825 和 TA-10 的腐蚀特性。对于 SCWG 和 SCWO 反应器，研究了 316、Incoloy 800、825、Inconel 600、625 和 Hastelloy C276 在 450 °C 和 520 °C（有和没有氧化剂的情况下）的腐蚀行为。在水临界点附近，所有材料的腐蚀速率均低于0.4 mm·a，其中316 L为候选材料。根据 pH 值的变化，材料经历活化 (350 °C) 和钝化 (400 °C) 途径。在SCWG和SCWO期间，Incoloy 825和Inconel 625在450 ℃和520 ℃下优先，腐蚀速率分别低于0.40 mm·a和0.50 mm·a。以化学腐蚀为主，形成双层氧化膜（FeO-FeCrO 和 NiO-CrO）。