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Electropolishing is one of the oldest electrochemical techniques which is widely adapted in industry. Since many years electropolishing has been growing and from day to day it fills more and more niches in different fields of science and technology. Among possible Surface Treatments, electropolishing occupies a key role, because it is the cleanest way for removing hundreds of microns of material. Most galvanic processes start their life from water solutions. Electropolishing is not an exception, even now Nb electropolishing based on water solution with sulfuric and hydrofluoric acids is the most used. Literature results with this standard mixture are excellent, however the EP of thousands of cavities could become an industrial nightmare from the point of view of security at work. HF is not like other highly corrosive acids: if, by accident, it gets in contact with skin, pain is not felt, but F- ions begin to pass through, searching for the bone calcium. Since many years world’s science has been interested in ionic liquids and it is not for nothing. A green chemistry based on ionic liquids has come to the fore, and at INFN-LNL laboratories was done the first Niobium electropolishing by a harmless mixture of Choline Chloride and urea heated around 150°C. In my work I will try to study influence of adding to the mixture some regulators. While it has already been showed the possibility of Nb dissolving with electropolishing effect,I will try to find recipe for technological Nb electropolishing. My second goal is to have ready a recipe to application on 6 GHz cavities.
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