Effects of NaOH Concentration on Section Structures of Oxide Films Based on TC4 by Anodic Oxidation Process

Abstract:

The section structure and growth mechanism of oxide films on titanium alloys Ti-6Al-4V (TC4) in the oxalate, silicate and phosphate hybrid electrolyte system by anodic oxidation method were investigated. Using TC4 as anodic, stainless steel as cathode, oxide films on the surface of TC4 titanium alloy were prepared by anodic oxidation process. X-ray diffract meter, spiral-micrometer, eddy current thickness meter and scanning electron microscope were used to measure the crystal structure, thickness, microstructure and chemical composition of the film . The experimental results indicate that NaOH concentration has almost no effects on the crystal structure of oxide films which are amorphous state. The oxide films on TC4 grow through three stages. At anodic oxidation primary stage, a thicker TiO₂ films on TC4 are able to form due to an abundant oxygen atmosphere. At anodic oxidation middle stage, a middle TiO_1.5 films form due to a not enough oxygen atmosphere. At anodic oxidation latest stage, a thin TiO_1.5 films form due to a heavily insufficient oxygen atmosphere. With NaOH concentration increasing, the ingrowth velocity (V_OA) of the interface between TC4 and oxide film is faster than dissolution rate (V_AD) of the surface oxide film resulting in a slight oxide film growth. The thickness of oxide film no longer varies when V_OA is equal to V_AD.

• Periodical: Key Engineering Materials (Volumes 645-646)
• Pages: 303-312
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.645-646.303
• Online since: May 2015
• Authors: Ji Kang Yan, Gang Yang*, Zhe Shi, Wan Xia Tang, Yun Feng Wu
• Keywords: Anodic Oxidation, NaOH, Structure of Oxide Film, TC4 Titanium Alloy

References

[1] R. Van Noort. Titanium: the implant material of today. J Mater Sci, 1987, 22(11): 3801~3811.

DOI: 10.1007/bf01133326

[2] Wang Qiang, Yang Min, Xu Zhujun. J Clin Rehab Tissue Eng Res, 2009, 13(4): 739~742.

[3] Qian Jiangang, Li Di, Guo Baolan. J Aviat Mater, 2005, 25 (4): 53~58.

[4] Deng Shuhao, Yi Danqing, Lin Shuangpin et al. Plat Surf Finish, 2006, 28 (5): 15~20.

[5] Yi Xiaohong, Fan Zhanguo, Zhang Jinglei et al. Mater Eng, 2010, (3): 38~41.

[6] Deng Shuhao, Yi Danqing, Lou Jia et al. Plat Surf Finish, 2006, 25 (2): 32~36.

[7] Cai Jianping, Liu Minghui, Zhang Xiaoyun. J Mater Prot, 2009, and (3): 15~17.

[8] Wen Qiang, Cao Fahe, Zhang Zhao et al. Corros Sci Prot Technol, 2009, 21 (2): 182~184.

[9] Wu Songlin, Liu Minghui, Yi Junlan et al. Mater Eng, 2013, (1): 6~12.

[10] Zhu Yongming, Hu Huili, Tu Zhenmi et al. Plat Surf Finish, 2009, 31(6): 35~38.

[11] Tao Haijun, Tao Jie, Wang Ling et al. J Nanjing University of Aeronautics & Astronautics, 2005(5): 597~602.

[12] Li qiang, Yu Jingyuan, Sun Xudong. Rare Metal Mater Eng, 2010, 33(7) 6: 1270~1275.

[13] Pouilleau J, Devilliers D, Garrido F, Durand-Vidal S., Mahea E. Structure and composition of passive titanium oxide films, Mater Sci Eng, 1997, B47: 235~243.

DOI: 10.1016/s0921-5107(97)00043-3

[14] Chen Jingyun, Liu Zongjian, Zhou Huan et al. Zhejiang Chem Ind, 2012, 3 (9) : 22~25.