Acid Pickling Service
Acid Pickling Service
(OP)
Hi,
I am looking for a testing lab which can perform HF+HNO3 pickling test for metal coupons within the US. The project will properly compensate this testing for safely handling HF+HNO3 environment. Pleasse contact me if you are interested or I would appreciate if you can recommend me a testing lab.
Regards,
Paul
I am looking for a testing lab which can perform HF+HNO3 pickling test for metal coupons within the US. The project will properly compensate this testing for safely handling HF+HNO3 environment. Pleasse contact me if you are interested or I would appreciate if you can recommend me a testing lab.
Regards,
Paul





RE: Acid Pickling Service
Is this for a potential material of construction screening test or a preexisting system?
RE: Acid Pickling Service
RE: Acid Pickling Service
RE: Acid Pickling Service
The specific material, processing, thermal history, and others enter into the picture when it comes to acid pickling.
As you probably know HNO3/HF is very corrosive material to most metals so if you are looking to handle the mixture the variety of metals that have acceptable corrosion rates is very limited.
If you are looking for the effects on different materials by said mixture the problem is in determining the correct ratio of acids which varies greatly, depending on the material and expected result. There are labs that can recommend a process for pickling a specific processed material.
RE: Acid Pickling Service
RE: Acid Pickling Service
If this would work for you let me know.
Ed
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Acid Pickling Service
1) Metal finishing jobshops that anodize aluminum castings or passivate stainless steel can do this. Maybe one of these: htt
2) If testing piping or tank materials, I think metals are a waste of money. Try polyethylene for ambient temperature, natural polypropylene (no TiO2 filler) for up to 150oF, PVDF and PTFE for higher temperatures.
3) The 10%HNO3 + 5%HF concentration is a bit unusual; seems only really good for Si-containing aluminum. It will excessively etch austenitic stainless, and etch + hydrogen embrittle ferritics, martensitics & titanium. It is usual to maintain a HNO3:HF > 10:1 to avoid H embrittlement (HNO3 is an oxidizing acid, HF is a reducing acid).
Purpose? How was this concentration selected?
Also, if you or anyone else (perhaps EdStainless?) has a good etch inhibitor for this acid solution, please post.
4) Before testing, confirm the concentration units -- e.g., vol% of the concentrated acids [nitric acid (67 wt.%) and HF (49 wt%)] or absolute wt.%.