Na5P3O10体系氢化锆表面微弧氧化陶瓷层组织与阻氢性能的研究

Microstructure and Hydrogen Permeation Resistance of Zirconium Hydride Coated by Micro Arc Oxidation Process in Na5P3O10 Solution

摘要:

在Na5P3O10+NaOH+Na2EDTA体系下，采用恒压模式对氢化锆进行微弧氧化处理获得连续、致密且裂纹、孔洞等缺陷较少的ZrO2陶瓷层。通过扫描电镜(SEM)、X射线衍射(XRD)及能谱(EDS)仪，分析了陶瓷层的表面形貌、截面形貌、相结构及元素分布。通过真空脱氢实验及XRD分析对陶瓷层的阻氢性能进行评价。结果表明：氢化锆表面ZrO2陶瓷膜厚度约为78 μm，陶瓷层由过渡层、致密层和疏松层构成；ZrH1.8 表面微弧氧化陶瓷层主要由M-ZrO2、T-ZrO2及C-ZrO2构成，主要为M-ZrO2，约90%; 微弧氧化陶瓷层氢渗透降低因子(PRF)高达11.7，具有优越的阻氢效果。

Abstract:

A dense and continuous coating with less cracks and holes was obtained by micro-arc oxidation (MAO) process in an electrolyte composed of Na5P3O10+NaOH+Na2EDTA under the constant voltage mode. The surface and cross-sectional morphologies, phase structures and chemical composition of the coatings were characterized by scanning election microscopy (SEM), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS), respectively. The hydrogen permeation performance of the oxide films was evaluated by vacuum dehydrogenation experiment and XRD. The results show that the obtained coating with an average thickness of 78 μm contains a transition layer, a dense layer and a loose layer. The coating is mainly composed of M-ZrO2, T-ZrO2 and C-ZrO2, and M-ZrO2 accounts for about 90%. The PRF (permeation reduction factor) value of the oxide film reaches up to 11.7, which indicates that the ZrO2 ceramic coating formed on the surface of ZrH1.8 has a superior hydrogen anti-permeation effect.