( 1. 哈爾濱工業(yè)大學 應用化學系，哈爾濱 150001;
2. 白城師范學院 化學系, 白城 137000)
摘 要: 研究了純Al及其合金LC9、 LY12 在偏鋁酸鈉溶液中微等離子體氧化成膜的特點。 通過X射線衍射, SEM和EMPA等分析了陶瓷膜層的相組成及表面、 截面形貌和膜層截面的元素含量分布，利用測厚儀測量了陶瓷膜層的厚度。 結果顯示： Al膜層由α-Al2O3相組成， LC9膜層由γ-Al2O3相組成， LY12膜層由γ-Al2O3和α-Al2O3兩相組成, 且膜層都由致密層和疏松層構成；膜層的厚度隨時間都近似呈線性變化； 在Al和LY12膜層中， 由內向外鋁元素的含量逐漸增加；在LC9膜層中， 鋁元素的分布略呈兩側高中間低； 在LC9和LY12膜層中， 鎂元素分布比較均勻； 在LC9膜層中， 含有很少量的鋅元素，而銅元素含量很不明顯； 在LY12膜層中含有很少量的銅元素。
關鍵字: 純鋁； 鋁合金； 微等離子體氧化； 陶瓷膜
SUN Xue-tong1, ZHANG Xue-lin1
（ 1. Department of Applied Chemistry, Harbin Institute of Technology,
Harbin 150001, China;
2. Department of Chemistry, Normal Institute of Baicheng,
Baicheng 137000, China）
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.
Key words: pure Al; aluminum alloy; micro-plasma oxidation; ceramic coatings
