Continuous electropolishing technique for long-length Hastelloy C-276 tape

Abstract

Preparation of the second-generation high-temperature superconducting tape by ion beam-assisted deposition (IBAD) requires a flat metal substrate. In this work, the electrochemical polishing of long-length Hastelloy C-276 alloy was studied, and its process parameters, characterized roughness and other properties were investigated. A 10-meter-long Hastelloy C-276 alloy was prepared by electrochemical polishing. The following optimized processing parameters are obtained: temperature of 45 °C, current density of 0.439 A·cm−2 and polishing time of 60 s. The average roughness value (Ra) of the surface is less than 5 nm (5 μm × 5 μm), which was characterized by atomic force microscopy. This value satisfies the requirements for the further preparation of transition-layer pair by the IBAD technology route.

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Acknowledgements

This study was financially supported by the National Science Foundation of China (Nos. 51571002, 51401003) and the Beijing Municipal Natural Science Foundation (Nos. 2172008, KZ201310005003).

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Correspondence to Hong-Li Suo.

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Hao, S., Wang, Y., Suo, H. et al. Continuous electropolishing technique for long-length Hastelloy C-276 tape. Rare Met. 37, 795–802 (2018). https://doi.org/10.1007/s12598-018-1106-y

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Keywords

  • Hastelloy C-276 alloy
  • Electrochemical polishing
  • Atomic force microscopy
  • Current density