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Electrochemical Polishing of Additively Manufactured Ti–6Al–4V Alloy

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Abstract

In this present paper, the electropolishing behavior of Ti–6Al–4V alloy fabricated by additive manufacturing in chloride-containing ethylene glycol electrolyte was surveyed. The impacts of chloride ion on surface quality and oxide film of Ti–6Al–4V were analyzed in dependence on the surface topography, roughness, weight loss ratio and compositions. The visual and microscopic results revealed that the optimally electropolished surface was attained in a 0.4 mol L−1 chloride electrolyte with a decreased surface roughness of 75.04% and a weight loss rate of 4.93%. For lower (C−1Cl ≤ 0.3 mol L−1) or higher concentrations (C−1Cl ≥ 0.5 mol L−1), a smooth and flat surface was not observed due to insufficient reactions or excessive anodic dissolution. During the electropolishing, the titanium oxides nucleated and corresponding surface tension increased, resulting in the formation of a stable TiO2 film on the surface of the Ti–6Al–4V alloy, increasing the corrosion resistance of the specimen.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51974069); and the Iron and Steel Joint Research Found of National Natural Science Foundation and China Baowu Steel Group Corporation Limited (Grant No. U1760118).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Yifei Zhang, Jianzhong Li, Shuanghang Che & Yanwen Tian

  2. Liaoning Key Laboratory for Metallurgical Sensors and Technology, Northeastern University, Shenyang, 110819, China

    Yifei Zhang, Jianzhong Li, Shuanghang Che & Yanwen Tian

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  1. Yifei Zhang
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  2. Jianzhong Li
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Correspondence to Jianzhong Li.

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Zhang, Y., Li, J., Che, S. et al. Electrochemical Polishing of Additively Manufactured Ti–6Al–4V Alloy. Met. Mater. Int. 26, 783–792 (2020). https://doi.org/10.1007/s12540-019-00556-0

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