Finite Element Modeling of Electrochemical Polishing of Niobium in Hydrofluoric-Sulfuric Acid Electrolyte

Wang, Kaiwen; Cai, Wenjun; Tian, Hui; Reece, Charles E.

doi:10.1149/1945-7111/ac7354

Title: Finite Element Modeling of Electrochemical Polishing of Niobium in Hydrofluoric-Sulfuric Acid Electrolyte

Journal Article · 10 June 2022 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/1945-7111/ac7354 · OSTI ID:1874773

Wang, Kaiwen ^[1];

^[1]; Tian, Hui ^[2]; Reece, Charles E. ^[2]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Niobium (Nb) used in superconducting radio-frequency cavities requires smooth surface to achieve optimal performance. In this work, a finite element model that coupled electrochemistry, heat transfer, and fluid dynamics was developed to investigate the electrochemical polishing mechanisms of Nb, using experimentally measured polarization results of coupon samples as validations. The current and potential distribution, oxide growth kinetics of Nb in a complex cavity geometry was investigated as a function of temperature and coolant flow. A low temperature coolant with intermediate flow rate was found to reduce surface current and ensure oxide uniformity. These results could shed light on the design of future particle accelerators.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC05-06OR23177

OSTI ID:: 1874773

Report Number(s):: JLAB-ACC-22-3654; DOE/OR/23177-5528

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 6 Vol. 169; ISSN 0013-4651

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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