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topic 9992

HF Free Stainless Steel Pickling Solution


(2001)

I am currently trying various chemical concoctions for pickling of stainless steel.All the solutions I've tried so far have had to contain HF.

Now I have managed to reduce the concentration of HF in my solution make up to just roughly 2% (solution is around 20% Nitric and 2% HF. However I would like to reduce this even further or even eliminate HF from my make up if at all possible.

Does anybody out there have a solution that can pickle stainless steel that is HF free or is less than 2% HF concentration. Any suggestions?

Patrick Guckian
- Rep. of Ireland


First of two simultaneous responses (2001)

Have you tried sulphuric anodic pickling as per Cannings Hand book?

Martin Trigg-Hogarth
Martin Trigg-Hogarth
surface treatment shop - Stroud, Glos, England


Second of two simultaneous responses (2001)

Try using ammonium bifluoride as a replacement for the HF. We discontinued using HF several years ago and have switched to ammonium bifluoride for several processes including stainless steel pickling. It has some disadvantages over HF, but it is much safer to deal with. Start with a pickle that is in the range of 30-40% Nitric and 15 g/L of ammonium bifluoride. You will need to make additions of ammonium bifluoride as needed to control the etch rate.

Jon Barrows
Jon Barrows, MSF, EHSSC
Springfield, Missouri



December 10, 2008

ammonium bifluoride mixed with diluted nitric acid will give you HF in the solution.

Lesley Wendelrup
finishing chemicals - Sweden



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