电解液中Ce^3＋／Ce^4＋含量对ZAlSi12Cu2Mg1微弧氧化膜特性和表面形貌的影响  

Effect of Ce^3＋/Ce^4＋ on the properties and microstructures of microarc oxidation films on ZAlSi12Cu2Mg1

作　　者：张静[1] 刘向东[1] 刘晓丽[1] 张雅萍[1] 吕凯[1] 乌迪[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《功能材料》2007年第A10期4078-4080,共3页Journal of Functional Materials

基　　金：内蒙古科技攻关资助项目（20040202）

摘　　要：用微弧氧化方法在铸造铝合金表面获得性能优良的陶瓷层对于提高其表面耐热、耐蚀及耐磨性，扩大其应用范围将具有重要意义。在微弧氧化过程中，通过控制电解液组成可以改善膜层性能。稀土金属离子化学性质活泼而且有助于普通陶瓷的烧结。研究了ZAlSi12Cu2Mg1合金在Na2SiO3电解液体系中微弧氧化时，Ce^3＋／Ce^4＋的引入对微弧氧化陶瓷层性能的影响，测定陶瓷层的厚度、硬度，用X射线衍射仪（XRD）分析其相组成，扫描电镜（SEM）观察其表面形貌，并初步探讨了Ce^3＋／Ce^4＋对陶瓷层形成机理的影响。结果表明：Ce^3＋在0．1～0．7g／L变化时，对陶瓷层的厚度和硬度影响较小，分别为165～193μm和449～935Hv。Ce^4＋在0．1～0.7g／L变化时，陶瓷层的厚度和硬度分别为126～148μm和463～1022HV。XRD分析结果显示，陶瓷层主要由α-Al2O3、γ-Al2O3、Al2SiO5和非晶相组成，加入Ce^3＋后，陶瓷层中Al2SiO5衍射强度明显降低。The properties of heat, corrosion and wear resistance of cast aluminum alloy will be improved remarkbly through producing ceramic coatings on it by microarc oxidation method. Cast aluminum alloy will be further applied in many other fields The properties of microarc oxidation films will be improved through adjusting the compositions of electrolyte in the process of microarc oxidation. Rare earth element ions have chemical activities and they are in favor of growth of sintered ceramics. In this paper, effect of adding Ce^3＋/Ce^4＋ into Na2SiO3 electrolyte on the properties of ceramic coatings on ZAlSi12Cu2Mg1 by microarc oxidation was studied. The properties of thickness, micro-hardness of the coatings were measured. The microstructures of the ceramic coatings were observed using scanning electron microscope （SEM） and the phase compositions of the coatings were analyzed by X-ray diffraction （XRD）. The mechanism of ceramic coatings was discussed primary. The result show that a range of 165～193μm of thickness, 449～935HV of microhardness and 126～148μm of thickness, 463～1022HV of microhardness was measured with Ce^3＋ and Ce^4＋ varying from 0.1 to 0.7g/L respectively.

关 键 词：铸造铝合金 微弧氧化 陶瓷层 CE^3+ Ce^4+ 

分 类 号：TG174.4[金属学及工艺—金属表面处理]