PROCESS FOR ELECTROLYTIC PICKLING USING NITRIC ACID-FREE SOLUTIONS

摘要

Process for electolytic pickling of stainless steel of the ferritic, martensitic, austenitic and duplex series, as well as superaustenitic and superferritic steels, Ni or Ni/Cr-based super alloys, and titanium and its alloys, carried out using an electrolytic pickling solution containing: H2SO4 in a concentration of from 20 to 140 g/l and Fe<3+> ions in a concentration of from 15 to 80 g/l, the Fe<2+> ions being in a quantity corresponding to a Fe<3+>/Fe<2+> ratio > 1 and preferably > 3.