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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2016, Vol. 37 ›› Issue (4): 1393-1400.doi: 10.7527/S1000-6893.2015.0126

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Effects of anodic oxide film thickness on surface characterization and adhesive strength of TB8 titanium alloy

YU Yongshui1, XIE Lansheng1, CHEN Minghe1, OUYANG Jindong2, ZHOU Xiwen3   

  1. 1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
    2. Jiangxi Hongdu Aviation Industry Group Company Ltd, Nanchang 330024, China;
    3. Jiangxi Hongdu Aviation Industry Co. Ltd, Nanchang 330024, China
  • Received:2015-04-09 Revised:2015-05-06 Online:2016-04-15 Published:2015-05-25
  • Supported by:

    Major Science and Technology Projects in Jiangxi Province-The Advanced Helicopter Key Technology Program (20114ABE02100103103)

Abstract:

The TB8 titanium alloy is anodized in the sodium tartrate electrolyte to investigate the effects of anodic oxide film thickness on the surface characterization and adhesive strength between the anodic oxide nanostructures and the epoxy resin. SEM, XRD and EDS are used to evaluate the morphology and crystalline structure of the anodic oxide films. The wettability and roughness of the anodic oxide films are measured using a contact angle meter and a digital video microscope. The correlation between the adhesive strength, surface morphology, phase composition, roughness and wettability of the anodic oxide film of TB8 titanium alloy is investigated. The results show that an anodic oxide film about 1-4 μm thick is formed on the surface after anodic oxide in the sodium tartrate electrolyte at the voltage of 1-30 V for 15 min. The anodic oxide film, which is mainly composed by rutile TiO2 and anatase TiO2, has a micro-and nano-porous rough structures and the wettability of water increases with the increase of the anodic oxide film thinkness. The maximum shear strength (19.6 MPa) is obtained when the thickness of the anodic oxide film is about 3 μm, which is improved by 88.5%, and the water contact angle is 43.2°, decreased by 56.1%; the surface roughness is 2.14 μm, improved by 137.8%.

Key words: anodic oxide, TB8 titanium alloy, surface morphology, adhesive properties, wettability, roughness

CLC Number: