Buffered electropolishing parameters on niobium sheet

Abstract

In this paper, studies on applying a new electrolyte to treat the surfaces of Nb sheets, which was called buffered electropolishing (BEP), were reported. Through studies of the BEP I-V characteristic and optimization of main parameters such as acid agitation, temperature, etc., much faster Nb polishing rate and smoother surface finish were achieved in comparison with those obtained from the conventional electropolishing (EP). The average polishing rate could reach around 2:5 m= min . It was over 7 times faster than that of the traditional EP. Meanwhile, the average surface mean square root roughness was around 50 nm over an area of ð200 Â 200Þ m 2 . This study shows BEP has a great potential to replace the traditional EP process and becomes a new generation of technology for treating Nb superconducting radio frequency cavities.

Electropolishing of Stainless Steel in Laboratory and Industrial Scale

“…The authors also presented the influence of the analyzed parameters on roughness results Ra and Sa and on the appearance of the final surfaces visualized with use of optical profilometry. On the other hand, Jin et al [16] examined the influence of changeable values of temperature and rotation rate of the mixer on the polishing rate, surface roughness, surface topography and chemical composition after the process. This enabled the selection of the optimum parameters for the analyzed process.…”

Effect of added ethanol in ethylene glycol–NaCl electrolyte on titanium electropolishing

“…In Fig. 5(a), it appears that most of the surface compounds on the E0-treated sample are Ti (Ti 4+ ) -O compounds (458.7 eV, 464.6 eV) [23,24] and Ti 3+ ions (457.2 eV) [25]. The Ti 4+ -O bonding suggests the presence of TiO 2 , while the Ti 3+ ions are known to indicate point defects, which have a Ti 2 O 3 -like surface structure and a dark violet color [25,26].…”

Electrochemical Polishing Applications and EIS of a Vitamin B4-Based Ionic Liquid

“…[1][2][3] Current methods for reducing roughness of the Nb surface typically employ electropolishing (EP) with concentrated sulfuric and hydrofluoric acid electrolyte solutions. 1,[4][5][6][7] Such acidbased methods produce final surface roughness within the acceptable range for SRF use, but are not ideal. Concentrated hydrofluoric and sulfuric acids have many inherent hazards, and disposal of used acid electrolyte can be costly.…”