C - Chemistry – Metallurgy – 25 – F
Patent
C - Chemistry, Metallurgy
25
F
C25F 1/06 (2006.01)
Patent
CA 2343778
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 Fe3+ ions in a concentration of from 15 to 80 g/l, the Fe2+ ions being in a quantity corresponding to a Fe3+/Fe2+ ratio > 1 and preferably > 3.
L'invention porte sur un procédé de décapage des aciers inoxydables de type ferritique, martensitique, austénitique et duplex, ainsi que des aciers superausténitiques et superferritiques, des superalliages à base de Ni ou de Ni/Cr, et du titane et de ses alliages, à l'aide de solutions de décapage électrolytique contenant: du H¿2?SO¿4? à raison de 20 à 140 g/l, et des ions Fe?3+¿ à raison de 15 à 80 g/l, la concentration des ions Fe?2+¿ correspondant au rapport F?3+¿/Fe?2+¿ > 1 et de préférence > 3.
Demertzis Yoannis
Fortunati Sandro
Giordani Paolo
Mancia Franco
Musso Augusto
Acciai Speciali Terni S.p.a.
Henkel Kommanditgesellschaft Auf Aktien
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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