In this study, the impedance response of a passive material is investigated, attributing it to a normal time constant distribution caused by resistivity variations within the passive film. Two models, namely the Power Law Model (PLM) and the recently developed Dielectric Bi-Layer Model (DBLM), are employed to express the impedance data. The PLM considers an oxide film as a single layer with a power-law distribution of resistivity, while the DBLM incorporates two distinct layers: an inner layer with constant resistivity () and an outer layer with resistivity following Young's theory. Application of both models to 316L stainless steel immersed in a borate buffer solution exhibit that PLM and DBLM fitting results are in good agreement with experimental data. While the models differ mainly in resistivity profiles at the vicinity of the outer interface, the results suggest that deviations in regressed parameters indicate similar ranges for resistivity profiles calculated by both models. DBLM, in particular, is highlighted as promising for interpreting impedance data of passive materials due to its reliance on physical concepts.

中文翻译：

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用于氧化膜电化学阻抗谱表征的介电双层模型


在这项研究中，研究了钝化材料的阻抗响应，将其归因于钝化膜内电阻率变化引起的正常时间常数分布。采用幂律模型（PLM）和最近开发的介电双层模型（DBLM）两种模型来表达阻抗数据。 PLM 将氧化膜视为具有幂律分布电阻率的单层，而 DBLM 则包含两个不同的层：具有恒定电阻率 () 的内层和具有遵循杨氏理论的电阻率的外层。将这两个模型应用于浸入硼酸盐缓冲溶液中的 316L 不锈钢，结果表明 PLM 和 DBLM 拟合结果与实验数据吻合良好。虽然模型的不同主要在于外界面附近的电阻率剖面，但结果表明回归参数的偏差表明两个模型计算的电阻率剖面的范围相似。特别是 DBLM，由于其依赖于物理概念，因此被认为有望解释无源材料的阻抗数据。