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针对铝合金蒙皮表面涂层修复对基材局部现场氧化处理的需求,研究了膏状氧化材料的调制方法,并探讨了氧化膏在2024-T3铝合金表面的成膜性能。通过扫描电镜、能谱、体视显微镜、点滴、电化学、接触角测试以及拉伸剪切实验考察了氧化膜的形貌和组成、耐蚀性能及粘接性能。实验表明,室温下铝合金表面经氧化膏处理后可快速生成氧化膜,膜层具有一定的微观孔洞结构,主要包含Al、F、Cr、O等元素;膜层耐蚀性与阿洛丁氧化液处理效果相近,与未氧化试样相比腐蚀电压由-0.898 V升至-0.880 V,腐蚀电流密度由2.582×10~(-5)A/cm~2降至3.334×10~(-7)A/cm~2,阻抗值由1.556×10~3Ω/cm~2增至1.347×10~5Ω/cm~2;表面自由能和粘附功分别由32.7 m J/cm~2和36.3 m J提高到55.7 m J/cm~2和109.7 m J,拉伸剪切强度由11.7 MPa提升为15.0 MPa,结果表明氧化膜的形貌和组成有助于获得更好的界面结合力并改善基材的粘接性能。
Aiming at the need of local oxidation treatment on the surface of aluminum alloy skin coating, the preparation method of the paste oxidation material was studied. The film formation performance of the oxide paste on 2024-T3 aluminum alloy surface was also discussed. The morphology and composition, corrosion resistance and adhesion properties of the oxide films were investigated by scanning electron microscopy, energy dispersive spectroscopy, stereo microscope, spotting, electrochemical tests, contact angle measurements and tensile shear tests. The experimental results show that the oxide film can be rapidly formed on the surface of the aluminum alloy after being treated with the oxidation paste at room temperature. The film has a certain microscopic pore structure and mainly contains elements such as Al, F, Cr, O and the like; The results show that the corrosion voltage increases from -0.898 V to -0.880 V and the corrosion current density decreases from 2.582 × 10 -5 A / cm 2 to 3.334 × 10 -7 ) A / cm ~ 2, the impedance increased from 1.556 × 10 ~ 3Ω / cm ~ 2 to 1.347 × 10 ~ 5Ω / cm ~ 2. The surface free energy and adhesion work increased from 32.7 m J / cm ~ 2 and 36.3 m ~ J increased to 55.7 m J / cm 2 and 109.7 m J, and the tensile shear strength increased from 11.7 MPa to 15.0 MPa. The results show that the morphology and composition of the oxide film help to obtain better interfacial adhesion and improve the bonding strength Material bonding performance.