Method for reproducing composition of electrolytic polishing solution for niobium material

摘要

A method of reproducing a composition of an electrolytic polishing solution for a niobium material, characterized in that, when the composition of the electrolytic polishing solution for the niobium material which is composed of HF, H2SO4 and water is lowered in the concentration of HF, the composition is replenished with fluorosulfuric acid and water in an amount equimolar therewith or so in order to recover the concentration of HF while the content of water is maintained substantially at a constant level.