Investigations on corrosion resistance behavior in micro-milling of Ti-6Al-4V and Ti-6Al-7Nb alloy: a comparative study
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DOI 10.1007/s12206-020-0827-7
Journal of Mechanical Science and Technology 34 (9) 2020 Original Article DOI 10.1007/s12206-020-0827-7 Keywords: · Corrosion resistance · Micro-milling · Surface roughness · Ti-6Al-4V · Ti-6Al-7Nb
Investigations on corrosion resistance behavior in micro-milling of Ti-6Al-4V and Ti-6Al-7Nb alloy: a comparative study D. Avinash and S. P. Leo Kumar
Correspondence to: S. P. Leo Kumar [email protected]
Citation: Avinash, D., Kumar, S. P. L. (2020). Investigations on corrosion resistance behavior in micro-milling of Ti-6Al-4V and Ti-6Al-7Nb alloy: a comparative study. Journal of Mechanical Science and Technology 34 (9) (2020) ?~?. http://doi.org/10.1007/s12206-020-0827-7
Received December 13th, 2019 Revised
April 30th, 2020
Department of Production Engineering, PSG College of Technology, Coimbatore, India
Abstract We compared the corrosion resistance behavior of Ti-6Al-4V and Ti-6Al-7Nb alloy in micro-milling operation. The influence of parameters such as cutting speed (vc), feed per tooth (fz) and depth of cut (ap) on corrosion behavior was analyzed. A total of 18 micro-slots of size 500 μm width and 10 mm length were produced by using Taguchi L9 based experimental design approach with the help of tungsten carbide flat end-mill cutter. Corrosion studies were performed using a potentiostat in an electrochemical cell with simulated body fluid. Surface morphology study revealed the surface damage before and after corrosion test. A minimal corrosion rate of 11.22 mm/year and 2.99 mm/year was observed for Ti-6Al-4V and Ti-6Al-7Nb, respectively. Ti-6Al-7Nb alloy showed the lowest corrosion rate due to the formation of TiO2 protective layer which offered a higher corrosion resistance.
Accepted July 2nd, 2020 † Recommended by Editor Hyung Wook Park
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Formation of a stable oxide layer on the surface of titanium (Ti) alloy highly influences the corrosion behavior. Monitoring the corrosion behavior of Ti-6Al-4V, Ti-6Al-7Nb and Ti-13Nb13Zr showed bi-layer oxide film formation [1]. Specimens in disc form are commonly used for corrosion tests. Cyclic polarization data obtained in the form of potential (Ecorr) vs current density (Icorr) plot showed that an increase in pH had a greater effect on the corrosion behavior of Ti-6Al-4V, Ti-6Al-7Nb than on Ti-13Nb-13Zr. It was also found that corrosion in protein solutions reduced the hardness of surface oxide films, and this effect was more pronounced in Ti6Al-4V and Ti-6Al-7Nb than in Ti-13Nb-13Zr [2]. Normally, corrosion analysis is performed on Ti alloy using different electrolytes like PBS and biological fluids and the corrosion performance is investigated in terms of polarization resistance, 'Ecorr' and 'Icorr'. An earlier study reveals that lower values of corrosion parameters are obtained for biological fluids than PBS [3]. Hank's solution is generally used as simulated body fluid (SBF) to conduct corrosion study. Its
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