access icon free Microhardness and corrosion resistance behaviour of Ti–6Al–4V alloy-coloured surface under WEDM-HS process

In this work, the reaction films were generated on the Ti–6Al–4V alloy by means of high-speed wire electrical discharge machining (WEDM-HS) technology in order to improve its microhardness and corrosion resistance. The microhardness was evaluated by using a nanoindentation tester. The corrosion behaviour was studied using measurements of potentiodynamic polarisation and electrochemical impedance spectroscopy. The experimental results showed that the processed alloys presented a higher microhardness than the matrix, and the thicker film on the surface had a greater microhardness. Additionally, the corrosion resistances of the processed alloys were superior, which could have been due to the lower corrosion current densities and the higher impedance values. Furthermore, the corrosion current densities of the processed alloys would decrease with thicker reaction films. This research provides important insights into the surface modification of titanium alloys.

Inspec keywords: nanoindentation; microhardness; hardness testing; corrosion resistance; vanadium alloys; aluminium alloys; electrical discharge machining; surface treatment; electrochemical impedance spectroscopy; thin films; titanium alloys; current density

Other keywords: high-speed wire electrical discharge machining technology; corrosion current density; corrosion resistance; alloy-coloured surface; titanium alloys; WEDM-HS process; surface modihcation; electrochemical impedance spectroscopy; potentiodynamic polarisation; reaction films; nanoindentation tester; microhardness; TiAlV

Subjects: Electrochemistry and electrophoresis; Mechanical and acoustical properties of solid surfaces and interfaces; Nondestructive materials testing methods; Thin film growth, structure, and epitaxy; Testing; Ballistics and mechanical impact (mechanical engineering); Fatigue, embrittlement, and fracture; Electrochemical analytical methods; Fracture mechanics and hardness (mechanical engineering); Machining; Surface treatment and coating techniques; Fatigue, brittleness, fracture, and cracks; Engineering materials; Surface treatment and degradation of metals and alloys

References

    1. 1)
    2. 2)
    3. 3)
    4. 4)
      • 23. Zhang, L.S., Xu, J.K., Chen, B.Y., et al: ‘Micro hardness analysis of colorful oxide film formation on titanium by using WEDM-HS process’. Proc. of 2015 IEEE ICMA, 2015, pp. 346350.
    5. 5)
    6. 6)
    7. 7)
    8. 8)
      • 8. Jiang, W., Shen, D.X., Zhang, Y.K., et al: ‘Study on coloring technology of titanium alloy’, Mater. Prot., 2005, 38, (9), pp. 1214(Chinese).
    9. 9)
    10. 10)
    11. 11)
    12. 12)
      • 17. Zhao, W.S.: ‘Advanced electrical discharge machining technology’ (National Defense Industry Press, Beijing, 2003), pp. 9496(Chinese).
    13. 13)
    14. 14)
    15. 15)
    16. 16)
    17. 17)
    18. 18)
    19. 19)
    20. 20)
    21. 21)
    22. 22)
      • 22. Abdel, S.H., Butt, D.P.: ‘Novel smart stannate based coatings of self-healing functionality for AZ91D magnesium alloy’, Electrochim. Acta, 2013, 197, pp. 296303.
    23. 23)
      • 18. Yu, D.Y., Tan, H.Y.: ‘Engineering optics’ (Mechanical Industry Press, Beijing, 2006), pp. 314316(Chinese).
http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2017.0037
Loading

Related content

content/journals/10.1049/mnl.2017.0037
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading