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在磷酸盐体系下,采用恒压模式对氢化锆进行微弧氧化。考察了微弧氧化时间对氧化膜的厚度、结构、表面形貌、截面形貌以及阻氢性能的影响。利用扫描电子显微镜(SEM)、X射线衍射(XRD)、膜层测厚仪分析了氧化膜的表面形貌、截面形貌、相结构及膜层厚度。通过真空脱氢实验评估膜层的阻氢性能。结果表明:随着氧化时间的延长氢化锆表面微弧氧化膜层厚度由65.2μm增大至95.4μm;氧化膜的生长速度随着氧化时间的延长而逐渐降低;氧化时间对于膜层的结构没有明显影响,膜层主要由单斜相氧化锆(M-ZrO2)和四方相氧化锆(T-ZrO2)构成;氧化时间的增加有助于提高氧化膜的致密性和阻氢效果,当氧化时间为25 min时,氧化膜的PRF值达到最大值11.6。
Under the phosphate system, the zirconium hydride was micro-arc oxidized by the constant pressure mode. The effects of micro-arc oxidation time on the thickness, structure, surface morphology, cross-sectional morphology and hydrogen-occluding properties of the oxide film were investigated. The surface morphology, cross section morphology, phase structure and film thickness of the oxide film were analyzed by scanning electron microscopy (SEM), X-ray diffraction (XRD) and thickness gauge. The hydrogen barrier properties of the film were evaluated by vacuum dehydrogenation experiments. The results show that with the increase of oxidation time, the thickness of MAO coating increases from 65.2μm to 95.4μm. The growth rate of oxide film decreases with the increase of oxidation time. The oxidation time has no effect on the structure of film (M-ZrO2) and tetragonal zirconia (T-ZrO2). The increase of oxidation time will help to improve the densification and hydrogen barrier of the oxide film. When the oxidation time For 25 min, the PRF of the oxide film reached a maximum of 11.6.