【摘要】 研究了纯Al及其合金LC9、LY12在偏铝酸钠溶液中微等离子体氧化成膜的特点。通过X射线衍射,SEM和EMPA等分析了陶瓷膜层的相组成及表面、截面形貌和膜层截面的元素含量分布,利用测厚仪测量了陶瓷膜层的厚度。结果显示:Al膜层由αAl2O3相组成,LC9膜层由γAl2O3相组成,LY12膜层由γAl2O3和αAl2O3两相组成,且膜层都由致密层和疏松层构成;膜层的厚度随时间都近似呈线性变化;在Al和LY12膜层中,由内向外铝元素的含量逐渐增加;在LC9膜层中,铝元素的分布略呈两侧高中间低;在LC9和LY12膜层中,镁元素分布比较均匀;在LC9膜层中,含有很少量的锌元素,而铜元素含量很不明显;在LY12膜层中含有很少量的铜元素。更多还原

【Abstract】 The micro-plasma oxidation（MPO） coating-forming characteristics for different kinds of aluminum alloys （pure Al, LY12 and LC9） in NaAlO₂ solution were study. Phase composition, section morphologies and the element distribution of the coating were analyzed by XRD, SEM and EPMA, respectively. The thickness of the coatings was measured by CTG-10 eddy current coating thickness gauge. The results show that the produced coating on pure Al is composed of α-Al₂O₃, the coating on LC9 is composed of γ-Al₂O₃ and the coating on LY12 is composed of α-Al₂O₃ and γ-Al₂O₃ The coating is composed of a compact layer and a loose layer. The thickness of the coatings on different substrate materials increases lineally with the MPO time increasing. For different substrate materials, Al in the coating all increases gradually from the inner layer to the outer layer. For LY12 and LC9, Mg in the coating distributes uniformly. For LC9, there is a little Zn in the coating and Cu does not exist apparently. For LY12, there is a little Cu on the coating.更多还原