Selection and development of an easily processed electrolyte for decontamination by electro-polishing
In the R&D project under consideration, there was developed an easy-to-process electrolyte based on organic substances, to replace the usual inorganic electrolytes (phosphoric acid and/or a mixture of phosphoric/sulphuric acids) used for decontamination by electropolishing. Three different organic electrolytes, i.e. formic acid, oxalic acid and acetylacetone using potassium bromide as the auxiliary electrolyte, were tested in the laboratory. The best results in the preliminary test series were attained with acetylacetone. This electrolyte has one of the better current efficiencies, with the produced acetylacetonates having the lowest solubility. Thus they settle out of the solution in the form of coarse crystalline products. Tests were made on radioactive reactor components using acetylacetone in a 400 A test facility. It was possible to decontaminate all parts below 0.37 Bq/cm2. A gamma-spectrometric evaluation revealed that the activity contained in the settled-out metallic acetylacetonate is five times higher than that in the electrolyte. It is only necessary to refill the spent acetylacetonate which makes it then possible to continue to use the electrolyte solution almost unrestrictedly.
Bibliographic Reference: EUR 12383 DE (1989) FS, 55 pp., ECU 6.25
ISBN: ISBN 92-826-0903-0
Record Number: 198911239 / Last updated on: 1994-12-01
Original language: de
Available languages: de