✦ LIBER ✦
Effect of ferric ions in AISI 316L stainless steel pickling using an environmentally-friendly H2SO4-HF-H2O2 mixture
✍ Scribed by L. Narváez; E. Cano; J. M. Bastidas
- Publisher
- John Wiley and Sons
- Year
- 2003
- Tongue
- German
- Weight
- 163 KB
- Volume
- 54
- Category
- Article
- ISSN
- 0947-5117
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✦ Synopsis
Abstract
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.