石墨烯浓度对ZrH1.8表面微弧氧化陶瓷层的影响

在Na₅P₃O₁₀-KOH-Na₂EDTA电解液中, 以石墨烯为添加剂, 在恒压模式下对ZrH_1.8表面进行微弧氧化处理。采用涂层划痕仪测试陶瓷层与基体的结合力, 通过真空脱氢实验来评价陶瓷层的阻氢性能。电解液中添加石墨烯后, ZrH_1.8表面微弧氧化陶瓷层均由内层致密层和外层疏松层构成, XRD图谱显示, 所制陶瓷层主要由M-ZrO₂和T-ZrO₂相组成。随着石墨烯浓度的增加, 陶瓷层的氢渗透降低因子(Permeation Reduction Factor, PRF)呈先增大后减小的趋势。当石墨烯浓度为0.10 g/L时, 陶瓷层的厚度约为66.5 μm, 表面孔洞和裂纹较少, 陶瓷层较致密, PRF值为13.2, 阻氢性能较好。

Graphene Concentration on Micro-arc Oxidation Ceramic Layer of ZrH1.8 Surface

The surface of ZrH_1.8 was subjected to micro-arc oxidation treatment in a constant pressure mode using graphene as an additive in Na₅P₃O₁₀-KOH-Na₂EDTA electrolyte. Adhesion of the ceramic layer to the substrate was tested using a coating scratch tester. Hydrogen barrier property of the ceramic layer were evaluated by vacuum dehydrogenation experiments. After adding graphene to the electrolyte, the micro-arc oxidation ceramic layer on the ZrH_1.8 surface is composed of an inner dense layer and a loose outer layer. XRD pattern shows that the ceramic layer is mainly composed of M-ZrO₂ and T-ZrO₂ phases. As the concentration of graphene increases, the permeation reduction factor (PRF) of the ceramic layer increases firstly and then decreases. When the concentration of graphene is 0.10 g/L, the thickness of the ceramic layer is about 66.5 μm, with less surface pores and cracks, denser ceramic layer, PRF at 13.2, and better hydrogen barrier performance.