北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (9): 1824-1831.doi: 10.13700/j.bh.1001-5965.2016.0728

• 论文 • 上一篇    下一篇

氧化膏处理对2024-T3铝合金表面性能的影响

张琪1, 李卫平1, 王新坤1,2, 冯剑波1, 刘慧丛1, 朱立群1   

  1. 1. 北京航空航天大学 材料科学与工程学院, 北京 100083;
    2. 北京航空工程技术研究中心, 北京 100076
  • 收稿日期:2016-09-12 出版日期:2017-09-20 发布日期:2017-02-21
  • 通讯作者: 王新坤,E-mail:wangxinkun1010@163.com E-mail:wangxinkun1010@163.com
  • 作者简介:张琪,女,硕士研究生;主要研究方向:铝合金的化学氧化和阳极氧化;王新坤,男,硕士,高级工程师;主要研究方向:材料的腐蚀与防护
  • 基金资助:
    国家自然科学基金(51371020)

Influence on surface performance of 2024-T3 aluminum alloy processed with oxidising paste

ZHANG Qi1, LI Weiping1, WANG Xinkun1,2, FENG Jianbo1, LIU Huicong1, ZHU Liqun1   

  1. 1. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
    2. Beijing Aeronautical Technology Research Center, Beijing 100076, China
  • Received:2016-09-12 Online:2017-09-20 Published:2017-02-21
  • Supported by:
    National Natural Science Foundation of China (51371020)

摘要: 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/cm2降至3.334×10-7 A/cm2,阻抗值由1.556×103Ω/cm2增至1.347×105 Ω/cm2;表面自由能和粘附功分别由32.7 mJ/cm2和36.3 mJ提高到55.7 mJ/cm2和109.7 mJ,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。

关键词: 氧化膏, 2024-T3铝合金, 氧化膜, 耐蚀性能, 粘接性能

Abstract: Oxidising paste was prepared for in-situ local oxidation treatment of coatings on aluminum alloy skin surface and its film-forming performance on 2024-T3 aluminum alloy was studied. Morphology and chemical composition, corrosion resistance, and adhesive performance of the oxidation film were investigated by SEM, EDS, stereomicroscope, drop test, electrochemistry test, contact angle and tension loading method. The results show that oxidation film can be obtained rapidly on aluminum alloy surface after treated by oxidising paste, and the film has microscopic pore structure, including Al, F, Cr, O, etc. Corrosion resistance of the film is similar to that gained by Alodine solution. Compared to the bare sample, corrosion potential increases from -0.898 V to -0.880 V, corrosion current density decreases from 2.582×10-5 A/cm2 to 3.334×10-7 A/cm2, and impedance improves from 1.556×103 Ω/cm2 to 1.347×105 Ω/cm2. Surface free energy and the work of adhesion rise from 32.7 mJ/cm2 and 36.3 mJ to 55.7 mJ/cm2 and 109.7 mJ, respectively. Strength properties of adhesive in shear is promoted from 11.7 MPa to 15.0 MPa. The results indicate that morphology and chemical composition of the oxidation film can enhance interface bonding strength and adhesive performance.

Key words: oxidising paste, 2024-T3 aluminum alloy, oxidation film, corrosion resistance, adhesive performance

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