PROCESS FOR DEMETALLISING HIGHLY ACID BATHS AND USE OF SAID PROCESS FOR ELECTROPOLISHING SPECIAL STEEL SURFACES

摘要

A process is disclosed for demetallising highly acid baths based on phosphoric and sulphuric acid, as well as a process for electropolishing special steel surfaces. The separate electrolytic reduction of Fe(III) into Fe(II), followed by the separation of precipitated substances, allows in particular the regeneration of used electrolyte compositions for electropolishing.