Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.


Material for Calcium bromide and Hydrogen bromide

Material for Calcium bromide and Hydrogen bromide

I am selecting pipe materials for 50% Calcium Bromide and hydrogen bromide. Can any one with experience recommend the materials suitable for these service?


RE: Material for Calcium bromide and Hydrogen bromide

Dry or wet?

Hydrogen bromide as a liquid or vapour?

RE: Material for Calcium bromide and Hydrogen bromide


wet hydrogen bromide (vapor).

One more questions is the material for hydrobromic acid.

Thank you so much!

RE: Material for Calcium bromide and Hydrogen bromide

About your only option for bromides above room temp.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Material for Calcium bromide and Hydrogen bromide

From what I've read, Ti will be risky.  Though Ti is good with wet chlorine and HCl, the bromides are more aggressive still.  Tantalum and non-metallics are your only long-term durability options for wet HBr/conc HBr acid.  

The trouble will be if you're neutralizing HBr or HBr acid with calcium hydroxide- Ta doesn't like strong bases, or rather likes them a little too much.  Ta has corrosion resistance similar to glass- the same weak points from a corrosion perspective that glass has, Ta tends to share.

RE: Material for Calcium bromide and Hydrogen bromide

moltenmetal, EdStainless

Thanks for comments. So how about 50% Calcium Bromide?

RE: Material for Calcium bromide and Hydrogen bromide

50% calcium bromide in water?  Does it even dissolve to that extent?  Guess most of the mass is Br- and HBr dissolves to ~50%, so perhaps it's possible.  Neutral or acidic?  If acidic, you really have HBr with a bunch of calcium ions rattling around, and the previous concerns remain.  

If it's neutral (pure water to which pure CaBr2 is added will be neutral), then this is basically a solution very high in bromide ion.  Austenitic stainless steels are probably out even at room temperature.  Titanium would probably be OK even at elevated temperatures.  You'd need to do more research before considering superaustenitics or duplexes.  

At room temperature, nonmetallics would still be your best bet with any of these materials.  They'd be corrosion immune rather than merely resistant.  

RE: Material for Calcium bromide and Hydrogen bromide

I know HBr and Br2 are not the same, however; having seen Ti spontaneously burst into flame in liquid bromine at room temp, I would recommend a careful review of literature and maybe perform some testing. (The heat melted the Hast C coupon test rack).

RE: Material for Calcium bromide and Hydrogen bromide

NO, I wouldn't use Ti in Br, but in aqueous solutions of Br it does very well.
At moderate temps some high alloy SS will work, but the limits are hit quickly.
An alloyed Ti grade is probably called for.
Look at the Timet corrosion guide.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


eBook: Product Innovation Platform Assessment
Over the past few years, there has been growing interest among industrial companies and solutions providers with regards to Product Innovation Platforms, where design, manufacturing and IoT tools are bundled into a single software package. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close