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Effect of ferric ions in AISI 316L stainless steel pickling using an environmentally‐friendly H 2 SO 4 ‐HF‐H 2 O 2 mixture
Author(s) -
Narváez L.,
Cano E.,
Bastidas J. M.
Publication year - 2003
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200390025
Subject(s) - pickling , ferric , hydrogen peroxide , hydrofluoric acid , nuclear chemistry , materials science , metallurgy , hydrogen , inorganic chemistry , chemistry , organic chemistry
A mixture of hydrogen peroxide, sulphuric and hydrofluoric acids has been used as pickling solution at pH 2.0 for AISI 316L austenitic stainless steel (SS). The stability of the H 2 SO 4 ‐HF‐H 2 O 2 mixture is assessed varying the ferric ions content from 0 to 40 g/L, the temperature from 25 to 60°C, and with and without stirring of the pickling solution. The AISI 316L SS pickling rate at 50°C was 2.6 and 0.2 mg/dm 2 day (mdd) in the absence and presence of 40 g/L ferric ions, respectively. p‐toluene sulphonic acid (PTSA) has been used as stabiliser of hydrogen peroxide.