镁合金微弧氧化工艺技术的研究.doc

PAGE 摘 要 微弧氧化技术是一种绿色环保的新兴表面处理工艺技术，主要用于对铝、镁、钛等轻金属及其合金的表面处理，它能有效地在基体材料表面上原位生长一层均匀的陶瓷膜。微弧氧化由于其工艺特点明显，表面处理的性能优势突出，自该技术被发明以来，备受人们的青睐。 研究了氧化时间、电压对膜层生长的影响。并通过对膜层生长规律的研究及膜层厚度、粗糙度的测试，确定最佳的微弧氧化工艺条件。采用扫描电镜(SEM)及X射线衍射相结构分析(XRD)对陶瓷氧化膜微观形貌及膜层结构进行分析，对陶瓷氧化膜的表面形貌和相成分进行了测试。 研究表明，电参数的控制对陶瓷层有重要影响。通过对膜层的XRD分析可知，膜层主要由不同晶型的A12O3组成。其中α-A12O3、γ-A12O3两相的生成是由熔融A12O3快速冷凝的结果。 关键词：微弧氧化技术；膜层；电参数 ABSTRACT Micro-arc oxidation(MAO),an environment-protection and new surface treatment technology was mainly used to the surface treatment of aluminum, magnesium, titanium and other light metals and their alloys, and can in homogeneous ceramic coating on the surface of these alloys. The MAO technology has an obvious advantage for surface treatment on account of its direct technique characteristic. It has been paid much attention to since it was invented. The effect of technologic parameter such as oxidation time、voltage on the growth of MAO ceramic film is discussed. The best MAO process conditions are found by the research of the law of film growth,it，s thickness and surface toughness. Using SEM and XRD,the micro-shape and fabric of ceramic have been analyzed. The results showed that the control of electrical parameters in MAO plays an important role in the coatings. The phase structures of ceramic film are analyzed by XRD. The results show that ceramic film is made up of different kinds of A12O3,and the growth of α-A12O3、γ-A12O3 is the results of rapid condensation of melt A12O3. KEY WORDS：micro-arc oxidation; coating; electrical parameters 目 录 TOC \o 1-3 \u 摘 要 PAGEREF _Toc264903218 \h I ABSTRACT PAGEREF _Toc264903219 \h II 目录 PAGEREF _Toc264903220 \h III 1绪论 PAGEREF _Toc264903221 \h 1 1.1课题研究背景及意义 PAGEREF _Toc264903222 \h 1 1.2微弧氧化机理 PAGEREF _Toc264903223 \h 3 1.2.1微弧氧化基础机理 PAGEREF _Toc264903224 \h 3 1.2.2微弧氧化成膜过程 PAGEREF _Toc264903225 \h 4 1.3 铝合金微弧氧化陶瓷层的生长规律 PAGEREF _Toc264903226 \h 5 1.3.1铝合金微弧氧化陶瓷层厚度增长规律 PAGEREF _Toc264903227 \h 5 1.3.2铝合金微弧氧化陶瓷层的结构 PAGEREF _Toc264903228 \h 6 1.3.3微弧