H2SO4
H2SO4
(OP)
hi guys,
I am in the process of making a selection between devices of various vendors (made of exposed parts of titanium (alloy), SS 420, tungsten carbide ?, hardmetal Co/WC, phosphor bronze). Also one gives Hastelloy as an option.
exposure to: 1 - 100% H2SO4, temperature 20 - 80 degrees C...
I guess you guys would go for the Hastelloy option. But what is your opinion and ranking (based on the limited info) on the H2SO4 corrosion resistance of the other materials ?
many thanks





RE: H2SO4
What is your application?
Any reason not to use glass or PTFE as material or liner?
Is upper limit really 100% H2SO4 or perhaps only 93 or 96 or 98%?
High-purity H2SO4?
RE: H2SO4
OK, you're right, let's say 98% H2SO4 is the upper limit. (I read that corrosion rates are often maximum around 70%).
Sorry, I should have been more specific. I am talking about rheometers, so the material has also to be tough, hard and abrasion resistant. PTFE and glass are indeed excellent in terms of corrosion resistance for H2SO4, but I guess they are no real options in this application (glass = brittle, PTFE is not hard enough). They are at least not given as an option by vendors. Hope to have made things more clear.
thanks again
RE: H2SO4
RE: H2SO4
Of course corrosion prevention in a rheometer application is quite critical as a slight change in dimensions easily yields fully wrong measurements. I have now found product info on various Hastelloy alloys and believe that they should be able to do the job. I guess minimization of contact time to these acids and also good washing after measurements are important. Will also look into Tantalum possibilities...
RE: H2SO4
RE: H2SO4
Try this link http://www.alleghenytechnologies.com/wahchang/pages/pro...
RE: H2SO4
Call
Scott Pyle
High Performance Alloys
444 Wilson St.
P.O. Box 40
Tipton, Indiana 46072
800 472-5569
he can help you with alloy choices.
RE: H2SO4
Jim Treglio
Molecular Metallurgy, Inc.