Al-Si共渗钢亚层氢扩散参数的多层模型数值解析与验证

doi:10.11900/0412.1961.2025.00176

金属学报 DOI: 10.11900/0412.1961.2025.00176

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Al-Si共渗钢亚层氢扩散参数的多层模型数值解析与验证

赵卫民^1,2,李小双¹,李家宁¹,于国荣¹,刘云蕊¹,孙建波^1,2

1 中国石油大学(华东) 山东省氢能装备与安全重点实验室青岛 266580

2 中国石油大学(华东) 材料科学与工程学院青岛 266580

DECOUPING HYDROGEN DIFFUSION PARAMETERS OF SUB-LAYERS IN ALUMINOSILICONIZED STEEL: INTEGRATED EXPERIMENTAL AND MODELING

ZHAO Weimin ^1,2, LI Xiaoshuang ¹, LI Jianing ¹, YU Guorong ¹, LIU Yunrui ¹, SUN Jianbo ^1,2

1 Shandong Provincial Key Laboratory of Hydrogen Energy Equipment and Safety, China University of Petroleum (East China), Qingdao 266580, China

2 School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China

引用本文:

赵卫民李小双李家宁于国荣刘云蕊孙建波. Al-Si共渗钢亚层氢扩散参数的多层模型数值解析与验证[J]. 金属学报, DOI: 10.11900/0412.1961.2025.00176.

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摘要: 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。

关键词 ：铝硅共渗钢, 阻氢层, 氢扩散系数, 多层结构, 高压气相氢渗透, 数值模型

Abstract：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.

Key words： Aluminosiliconized steel, Hydrogen barrier layer, Hydrogen diffusion coefficient, Multi-layered structure, High-pressure gaseous hydrogen permeation, Numerical modeling

收稿日期: 2025-06-24

ZTFLH:

TG174.4

基金资助:国家自然科学基金项目;山东省自然科学基金;江苏省前沿技术研发计划项目

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https://www.ams.org.cn/CN/Y0/V/I/0

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