Abstract Metal salt films play a critical role in high rate dissolution processes such as within an active pit. However, structural and compositional characterization of salt films is challenging owing to the dynamic nature of the dissolving interface. Here, the salt film formed on SS304 one-dimensional artificial pit surface was preserved by flash freezing and characterized using cryo-based focused ion beam/scanning electron microscopy. The salt film exhibits a porous structure. Ni is co-located with Fe in the salt film, indicating the formation of co-precipitated salt containing Fe2+ and Ni2+. Additionally, a salt film growth model is presented based on ion transport.

中文翻译：

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基于低温的金属盐膜结构表征和生长模型

摘要 金属盐膜在活性坑等高速溶解过程中起着关键作用。然而，由于溶解界面的动态特性，盐膜的结构和成分表征具有挑战性。在这里，SS304 一维人工坑表面上形成的盐膜通过快速冷冻保存，并使用基于低温的聚焦离子束/扫描电子显微镜进行表征。盐膜呈现多孔结构。Ni在盐膜中与Fe共存，表明形成了含有Fe2+和Ni2+的共沉淀盐。此外，还提出了基于离子传输的盐膜生长模型。