EP 0236354 B1 19890712 - METHOD FOR THE ACID ETCHING OF STAINLESS STEEL PRODUCTS
Title (en)
METHOD FOR THE ACID ETCHING OF STAINLESS STEEL PRODUCTS
Publication
Application
Priority
FR 8514220 A 19850919
Abstract (en)
[origin: FR2587369A1] Method for etching stainless steel products wherein an etching bath is used which has the following ignition composition: HF 10 to 50 g/l; dissolved ferric iron (Fe<3+>) >= 15 g/l; water: the remainder, at a temperature comprised between 15 and 70<o>C, characterized in that during the etching operation or operations, the content of ferric iron of the bath is maintained at at least 15 g/l by oxidation of the bath comprising at least one or a plurality of air injections with a total flow rate higher or equal to 1 Nm<3> per m<2> of etched stainless steel and per hour (h) of etching of each etched surface element. The method of the invention is particularly applicable to the industrial etching of sheets and bands of stainless steel, and avoids the utilization of nitric acid and the pollutions resulting therefrom.
IPC 1-7
IPC 8 full level
C23G 1/08 (2006.01)
CPC (source: EP)
C23G 1/086 (2013.01)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
FR 2587369 A1 19870320; FR 2587369 B1 19930129; BR 8606873 A 19871103; CA 1272980 A 19900821; DE 3664340 D1 19890817; EP 0236354 A1 19870916; EP 0236354 B1 19890712; ES 2000222 A6 19880116; FI 81126 B 19900531; FI 81126 C 19900910; FI 872187 A0 19870518; FI 872187 A 19870518; JP H0420996 B2 19920407; JP S62501981 A 19870806; MX 168028 B 19930429; WO 8701739 A1 19870326
DOCDB simple family (application)
FR 8514220 A 19850919; BR 8606873 A 19860728; CA 514703 A 19860725; DE 3664340 T 19860728; EP 86904835 A 19860728; ES 8600701 A 19860729; FI 872187 A 19870518; FR 8600267 W 19860728; JP 50418386 A 19860728; MX 329086 A 19860729