Heat Treatment of Metals ›› 2021, Vol. 46 ›› Issue (6): 65-68.DOI: 10.13251/j.issn.0254-6051.2021.06.013

• PROCESS RESEARCH • Previous Articles     Next Articles

Effect of annealing temperature on surface microstructure and corrosion properties of MAO-TC4 titanium alloy

Wang Jin1,2, Yu Guoqing1, Wang Guodi1, Zhang Manxue1, Feng Tian1, Xie Niansuo1,2, Jing Ran1,2   

  1. 1. School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong Shaanxi 723000, China;
    2. National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, Shaanxi University of Technology, Hanzhong Shaanxi 723000, China
  • Received:2021-03-01 Online:2021-06-25 Published:2021-07-21

Abstract: Surface treatment of TC4 alloy was carried out by using micro-arc oxidation (MAO). The morphologies, thickness, hardness, phase structure, and electrochemistry corrosive behavior of surface oxide film on the MAO-TC4 alloy annealed at different temperatures were studied by means of X-ray diffractometer, field emission scanning electron microscope, laser confocal microscope, microhardness test and electrochemical corrosion. The results show that, with the increase of annealing temperature, microhardness of surface oxide film of the MAO-TC4 alloys increases, and when annealed at 850 ℃, the maximum hardness of 592 HV0.2 can be obtained. The film corrosion resistance of the MAO-TC4 alloy increases at first and then decreases with the increase of annealing temperature in the range of 450-850 ℃. When the annealing temperature is 650 ℃, the self-etching current density of film is 0.125 μA/cm2, at which the optimal corrosion resistance is presented.

Key words: TC4 titanium alloy, micro-arc oxidation, phase structure, electrochemical corrosion, annealing temperature, microstructure

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