The corrosion behavior of an ultralow iron nickel-based alloy Inconel 625 under high-temperature water has been evaluated. The results show that surface oxidation and pitting were the principal corrosion mechanisms of Inconel 625 during the initial immersion period. The surface layer of the oxide film is first Ni-enriched and then Fe-enriched as immersion time increases. The iron ions dissolved from the autoclave could lead to the formation of NiFe2O4 and have a great influence on the oxidation behavior of Inconel 625. The oxides nucleated by solid-state reactions with selective dissolution of Fe and Ni and then grew up through precipitation of cations from solution.

中文翻译：

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铁离子对Inconel 625在高温水中腐蚀行为的影响

已经评估了超低铁镍基合金 Inconel 625 在高温水中的腐蚀行为。结果表明，表面氧化和点蚀是 Inconel 625 在初始浸泡期间的主要腐蚀机制。随着浸渍时间的增加，氧化膜的表层首先富镍，然后富铁。从高压釜中溶解的铁离子会导致 NiFe2O4 的形成，对 Inconel 625 的氧化行为有很大影响。 通过固态反应与 Fe 和 Ni 的选择性溶解成核，然后通过阳离子沉淀长大的氧化物从解决方案。