(1. 蘭州理工大學(xué)理學(xué)院，蘭州 730050；
2. 中國科學(xué)院蘭州化學(xué)物理研究所固體潤滑國家重點實驗室，蘭州 730000)
摘 要: 采用微弧氧化(MAO)技術(shù)，通過在硅酸鹽電解液中加入NH4VO3，在鋁合金表面制備黑色陶瓷膜。利用分光光度計、熱震試驗評價黑色膜層的光吸收性能以及與鋁合金基體的結(jié)合狀況，采用掃描電鏡(SEM)、能譜儀(EDS)研究黑色膜層的生長過程。結(jié)果表明：黑色微弧氧化膜層具有優(yōu)異的吸光性能，但抗熱震性能較差，表層易發(fā)生剝落。黑色膜層的生長過程可分為兩個階段：前期以基體的氧化為主，得到的膜層顏色較淺，與基體結(jié)合緊密；而后期以電解液中化合物的沉積為主，膜層顏色加深，并與前期生長的膜層發(fā)生分層，導(dǎo)致膜層的結(jié)合力變差。
關(guān)鍵字: 鋁合金；微弧氧化；黑色陶瓷膜；生長過程
（1. School of Science, Lanzhou University of Technology, Lanzhou 730050, China;
2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China）
Abstract:The black ceramic coatings were prepared on Al alloys by micro-arc oxidation (MAO) in silicate electrolyte containing NH4VO3. The optical property and adhesion strength of the coatings were studied by spectrophotometer and thermal shock test. The forming process of the coatings was investigated by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The results show that the black ceramic coatings have high light absorptance, but poor adhesion strength, the surface layer is easy to peel off. The forming process of black PEO coatings can be divided into two phases. At first, the oxidation of substrate plays a predominant role, forming a thin layer of alumina which appears gray and adheres well to the substrate. And then, the compound deposition in the electrolyte play a leading role. The color of coating is further deepen, and the delamination is occurred with the previous coating, which leading to deterioration of adhesion.
Key words: aluminium alloy; micro-arc oxidation; black ceramic coating; forming process
