现有氢渗透测试技术仅能获取材料的平均氢扩散参数，难以直接测定钢表面多层阻氢结构的亚层参数。本文以TP80SS钢为基体，通过热浸镀铝工艺制备铝硅共渗钢，在钢表面形成外Al-Si合金层、内Fe-Al-Si金属间化合物层的多层阻氢结构。采用高压气相氢渗透试验，结合多层扩散理论模型与Python数值计算方法，解析各亚层的氢扩散参数。结果表明：TP80SS钢基体、Fe-Al-Si金属间化合物层和Al-Si合金层的氢扩散系数分别为2.03×10-6、4.83×10-9和7.48×10-10 cm2·s-1。在10 MPa氢气环境下，铝硅共渗层使充氢侧钢次表面氢浓度由1.04×10-6 mol·cm-3降至7.76×10-8 mol·cm-3。本研究通过实验与模型相结合的方法，首次实现了多层阻氢结构各亚层氢扩散参数的精准解析，为复杂阻氢结构的设计与优化提供了理论依据。

Current hydrogen permeation testing techniques can only measure the average hydrogen diffusion parameters of materials, making it difficult to directly determine the sub-layer parameters of multi-layered hydrogen barrier coatings on steel surfaces. This study employed TP80SS steel as the substrate to fabricate aluminosiliconized steel via a hot-dip aluminizing process. This process formed a multi-layered hydrogen barrier structure comprising an outer Al-Si alloy layer and an inner Fe-Al-Si intermetallic compound layer. Utilizing high-pressure gaseous hydrogen permeation experiments, EDS layer thickness measurements, a multi-layer diffusion theoretical model, and Python-based numerical calculations, the hydrogen diffusion parameters of each sub-layer were resolved. The results demonstrate that the hydrogen diffusion coefficients of the TP80SS steel substrate, the Fe-Al-Si intermetallic compound layer, and the Al-Si alloy layer are 2.03×10-6 cm2·s-1, 4.83×10-9 cm2·s-1, and 7.48×10-10 cm2·s-1, respectively. Under a 10 MPa hydrogen environment, the aluminosiliconized coating reduced the hydrogen concentration on the hydrogen-charging side of the steel surface from 1.04×10-6 mol·cm-3 to 7.76×10-8 mol·cm-3. Significant hydrogen concentration discontinuities exist at material interfaces: the hydrogen concentration ratio (k1) across the interface between the outer Al-Si alloy layer and the inner Fe-Al-Si intermetallic compound layer is 26.11, while the ratio (k2) across the interface between the intermetallic compound layer and the steel substrate is 9.52. This indicates that the Al-Si alloy layer possesses superior hydrogen barrier efficiency compared to the Fe-Al-Si intermetallic compound layer. By integrating experimental methods with theoretical modeling, this study has, for the first time, achieved precise resolution of the hydrogen diffusion parameters for each sub-layer within a complex multi-layered hydrogen barrier structure. This approach provides a crucial theoretical foundation for the design and optimization of advanced hydrogen-resistant coatings.