(1. 常州大學(xué) 材料科學(xué)與工程學(xué)院，常州 213164；
2. 常州大學(xué) 江蘇省材料表面科學(xué)與技術(shù)重點(diǎn)實(shí)驗(yàn)室，常州 213164)
摘 要: 采用微弧氧化(MAO)技術(shù)，以硅酸鹽為主要電解液成分，通過加入稀土元素鈰以及石墨烯添加劑，在7050高強(qiáng)鋁合金表面制備微弧氧化膜層。利用掃描電鏡(SEM)、體視顯微鏡、X射線衍射儀(XRD)、摩擦磨損試驗(yàn)機(jī)以及電化學(xué)工作站研究微弧氧化陶瓷膜層的形貌、粗糙度、相組成和元素分布以及耐磨性和耐蝕性。結(jié)果表明：同時加入4 g/L CeO2和10 g/L的石墨烯制備的復(fù)合膜層表面微孔尺寸明顯降低，結(jié)構(gòu)致密，耐磨性較好，粗糙度最低(1516.03 nm)，膜層主要由α-Al2O3和γ-Al2O3組成。且此時的復(fù)合膜層自腐蝕電位最大，自腐蝕電流最小，耐腐蝕性最佳。
關(guān)鍵字: 7050高強(qiáng)鋁合金；微弧氧化；稀土元素；石墨烯；復(fù)合膜層
（1. School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China;
2. Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou 213164, China）
Abstract:The ceramic coatings were prepared on the surface of 7050 high strength aluminum alloy by micro-arc oxidation process in a silicate electrolyte added with rare earth element cerium or graphene. The surface morphology, roughness, phase composition and distribution of elements, wear resistance and corrosion resistance were analyzed by the scanning electron microscope (SEM), surface profilometer, X-ray diffractometer (XRD), friction-abrasion tester, electrochemical workstation, respectively. The results show that the micro-pore size of the composite coatings which mainly consists of α-Al2O3, γ-Al2O3 decreases and the compactness obviously improves with the simultaneous addition of 4 g/L CeO2 and 10 g/L graphene to the electrolyte. In addition, the roughness is the lowest (1516.03 nm) as well as the wear resistance is significantly improved. The corrosion is the best that the corrosion potential of the coating is the maximum and the corrosion current is the minimum.
Key words: 7050 high strength aluminum alloy; micro-arc oxidation; rare earth; graphene; composite coating
