摘要
The BCP solutions use mixed acids based on HF acid,which carry significant potential safety hazard during operation.Developing a safe and green polishing solution without HF is an important research subject for cavity’s surface treatment[1].We adopt green ionic liquids for polishing solution of electropolish niobium samples.In the experiment,niobium samples were electropolished from a 1:2:1 Choline chloride–urea-ammonium fluoride ionic liquid under different conditions(Fig.1).The surface of Nb sample without any treatment is dark and uneven(1#of Fig.1).After electropolished at 50℃,the surface of Nb sample become smooth,but the glossiness is not good(2#of Fig.1).Improving the electropolishing temperature to 80℃,the glossiness of Nb becomes good and the surface becomes even(3#of Fig.1).In order to compare the electropolishing effect intuitively,put a ruler before the treated samples.
