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1.
Na3PO4—Na2B4O7体系中钛合金微等离子体氧化陶瓷膜研究   总被引:11,自引:2,他引:9  
在钛合金上用微等离子体氧化法制备氧化膜,用扫描电镜(SEM)、X-射线(XRD)测其表面形貌、相组成,并对现象及测试结果进行分析,。从而推理其成膜机理。  相似文献
2.
复合氧化法制备多孔二氧化钛梯度薄膜   总被引:4,自引:1,他引:3  
为了阻止金属离子向体液中游离和改善纯钛植入体的生物相容性,采用复合氧化法,即将预阳极氧化及微弧氧化相结合的方法,对纯钛试件进行表面改性。用X射线衍射仪(XRD)、扫描电镜(SEM)和SEM附带的能谱仪(EDS)对薄膜的相组成和形貌进行了分析和观测;用MH-3型显微硬度测试计和WS-97型划痕仪对薄膜的硬度和结合强度进行了测试。结果表明:复合氧化法可以制备出表面多孔、内层致密的二氧化钛梯度薄膜,致密的锐钛矿型二氧化钛薄膜的厚度约为0.7μm,多孔的锐钛矿和金红石混合型薄膜的厚度约为1.7μm。薄膜的表面硬度为370.0HV0.2,与基体的结合强度为52.7N。用复合氧化法制备的多孔二氧化钛梯度薄膜可有效地阻止金属离子的溶出,促进细胞的黏附和生长,临床应用前景广阔。  相似文献
3.
热喷涂与微弧氧化法制备镁合金表面陶瓷层   总被引:2,自引:0,他引:2  
通过对热喷涂与微弧氧化这两种镁合金表面陶瓷层制备方法的综合比较,探讨了它们各自的适用范围、优缺点和应用前景,并对它们作为镁合金表面防护技术的发展方向进行了展望.  相似文献
4.
钛合金表面微弧氧化耐磨和耐蚀膜层的研究进展   总被引:2,自引:0,他引:2  
微弧氧化是一种直接在有色金属或其合金表面原位生成陶瓷膜的新技术,利用该技术可在钛合金表面生成耐磨和耐蚀性能优良的膜层。介绍了微弧氧化技术及其特点、钛合金表面微弧氧化耐磨和耐蚀膜层的研究进展,并指出了钛合金表面微弧氧化耐磨和耐蚀膜层的应用前景和今后膜层研究的发展方向。  相似文献
5.
Samples with two different shapes of 2024 aluminum alloy were treated with micro-arc oxidation (MAO), and the formation process and mechanism of oxidation film was analyzed. The results show that different geometrical curvature of the material has an influence upon the uniformity of films and the corrosion-resistance.  相似文献
6.
镁合金微弧氧化研究   总被引:1,自引:0,他引:1  
在两种体系中研究了镁合金的微弧氧化.对比实验表明,磷酸盐体系中钕对氧化膜外观、厚度和耐蚀性有较大改善,提高钕盐浓度效果更佳;硅酸盐体系中,用稀土盐溶液浸泡试样后,制得的试样表面颜色较白,膜层分布更均匀,起弧容易.两种体系中用稀土转化膜取代镁合金表面的自然氧化膜进行微弧氧化处理,获得的陶瓷层分布更加均匀,表面更光滑致密,耐蚀性显著加强.  相似文献
7.
Magnesium and its alloys have been used in many industries, but they are reactive and require protection against aggressive envi-ronments. In this study, oxide coatings were applied on AZ91D magnesium alloy using micro-arc oxidation (MAO) process. Then, in order to seal the pores of the MAO coatings, the samples were immersed in cerium bath for different times. The surface morphologies and composi-tions of the coatings were analyzed by scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS), respectively. The corrosion behavior of the coatings was investigated with electrochemical impedance spectroscopy (EIS) and potentiodynamic polariza-tion tests in 3.5 wt.% NaCl solution. The amount of the porosity of the coating was measured by electrochemical method. It was found that the sealing treatments by immersion in cerium bath successfully sealed the pores of the MAO coatings. The results of the corrosion tests showed that the MAO coating which was sealed in Ce bath for 10 min enhanced the corrosion resistance of the substrate significantly. Fur-thermore, this coating had the lowest amount of the porosity among the coatings.)  相似文献
8.
镁合金表面微弧氧化处理研究进展   总被引:1,自引:0,他引:1  
介绍了镁合金微弧氧化技术的发展,氧化膜形成的基本原理和生长规律,总结和分析了不同工艺参数如电压、电流密度、电解液体系等对氧化膜性能的影响规律,并简单介绍了电解槽中电导率、添加剂对氧化膜的影响情况,同时指出镁合金微弧氧化研究的不足及发展方向。  相似文献
9.
Magnesium alloys are widely used as shells of 3C (computer, mobile phone and consumer electronics) equipments for its impressive mechanical and physical properties, such as low density, good resistance to electromagnetic radiation, suitable for high pressure diecasting and easily recycling, etc. But poor corrosion resistance confines its extensively application. In this paper, protective coatings was successfully prepared on AZ91D magnesium alloys by micro-arc oxidation (MAO) and painting process. Microstructures and phases of MAO coatings were invesgated with scanning electron microscope (SEM) and X-Ray diffractometer. Mechanical properties of MAO coating, such as adhesive force and corrosion resistance, were also tested. Results showed that MAO coatings were a good base for painting process. MAO coatings with paint have good adhesive properties to base metal and excellent corrosion resistance. Micro-arc oxidation with painting process is a good kind of surface treatment to improve the corrosion resistance of mobile phone shell made of AZ91D magnesium alloys.  相似文献
10.
微等离子体氧化技术是一种直接在有色金属表面原位生长陶瓷膜的新技术。用此技术制备的陶瓷膜具有优良的耐腐蚀、耐高温冲击、耐磨和电绝缘等特性。在此文中,介绍了微等离子体氧化技术的发展历史、陶瓷膜的特性及制备原理与工艺,指出微等离子体氧化技术是制备陶瓷膜的一种新工艺,并予以前景展望。  相似文献
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