(1. 哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 現(xiàn)代焊接生產(chǎn)技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，哈爾濱 150001；
2. 上海航天技術(shù)研究院 800所，上海 201600)
摘 要: 在含有Na2SiO3和KOH的電解液中以恒定電壓氧化方式對(duì)工業(yè)純鋁進(jìn)行微弧氧化處理，研究電壓對(duì)非連續(xù)微弧氧化成膜特性的影響。采用XRD及SEM對(duì)微弧氧化膜的相組成及表面形貌進(jìn)行分析。結(jié)果表明：非連續(xù)微弧氧化的電流在工作間隔處出現(xiàn)一定程度的降低；非連續(xù)工作模式的膜層生長(zhǎng)速率與連續(xù)模式基本相同，并且都隨工作電壓的增加而增加；不同成膜模式所生長(zhǎng)的微弧氧化膜均由較多的γ-Al2O3和少量的α-Al2O3相組成；非連續(xù)成膜方式對(duì)微弧氧化陶瓷膜的形貌影響不大，且未造成氧化膜分層現(xiàn)象；不同成膜模式下所形成的微弧氧化陶瓷層的耐磨性能和耐腐蝕性能隨工作電壓變化具有相同的變化規(guī)律，均隨電壓的增加而增大；非連續(xù)成膜提高了微弧氧化控制的靈活性。
關(guān)鍵字: 純鋁；微弧氧化；非連續(xù)模式；耐磨性；耐蝕性
（1. State Key Laboratory of Advanced Welding Production and Technology, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. The 800th Institute, Shanghai Academy of Spaceflight Technology, Shanghai 201600, China）
Abstract:Pure aluminum was treated by micro-arc oxidation in electrolyte containing Na2SiO3 and KOH at constant voltage mode. The effect of voltage on the properties of the coating prepared by discontinuous micro-arc oxidation was investigated. The phase composition and surface morphologies of MAO coatings were analyzed by XRD and SEM. The results show that, for the discontinuous MAO, the current drops to some extent at the interrupted point. MAO coatings fabricated by different modes show the similar thickness that increases with increasing oxide time. The processing mode has slight effects on the phase composition of MAO coatings, which are mainly composed of γ-Al2O3 and α-Al2O3. The surface morphology of the MAO coatings is hardly influenced by processing mode and no lamination is observed for the coatings prepared by discontinuous mode. The coatings fabricated by different modes possess the similar changing rules of wear resistance and corrosion resistance. This discontinuous mode improves the control flexibility during micro-oxidation processes.
Key words: pure aluminum; micro-arc oxidation; discontinuous mode; wear resistance; corrosion resistance
