which material is good with ferric chloride?

[sadochemeng]

Hi,

we are designing some piping and tubing for WWTP. We will use ferric chloride at 5% and 35%. We will normally use PVC piping but at 5% it may contact some metals.what kind of metal should we use? I kinda researched it and only titanium looks corrosive resistant to ferric chloride but we dont wanna go there. Do u think just 5% would effect cast iron or stainless steel so bad? Any other ideas.
Thanks a lot. Oh also for plastic piping, anything better than PVC. solution will be about room temp.all the time \.also for gaskets what kind of rubber?

thanks a lot again...

 

[cub3bead]

Go to

http://www.coleparmer.com/techinfo/chemcomp.asp

select ferric chloride in appropriate space and submit it. You will get a list of suitable and unsuitable materials of construction.

PS 5% FeCl3 will pretty much destroy cast iron and stainless.

 

[JLSeagull]

ASTM G 48 method B addresses pitting and crevice corrosion with 6% Ferric Chloride. Consider the Restek Silco corrosion resitant coating for stainless or alloy tubing. The Silco coating suggests an order of magnitude improvement in the metal weight loss.

 

[stanier]

ICI (Orica) give he following:
Rubber lined MS (rubber can be natural or butyl)
PVC-U with FRp reinforcement for strength
GRP with vinyl esters

Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng

http://www.waterhammer.bigblog.com.au

 

[waterdoc2]

As a manufacturer of ferric chloride who frequently trials the material at WTPs and WWTPs, we recommend that no metal (except for titanium and possibly Hastelloy-C) be used for any wetted parts, regardless of the concentration of the ferric chloride. The 5% FeCl3 will eat through the metal far slower than the 35% FeCl3. Nonetheless, it will eventually eat through it. (Typically this occurs around 0300 when no one is making their rounds at the plant). If metal has to be used, it should be rubber-lined or epoxy coated. Many plastics (e.g., CPVC, PVC, PTFE, PP) and rubber are recommended.

 

[sadochemeng]

thanks a lot for all the replies.they really helped a lot. What about concrete? Any research made on concrete? any information? what type of concrte is good? or does ferric chloride have any effect on concrete?
thanks

 

[waterdoc2]

Ferric chloride is corrosive to concrete. Any spills should be readily neutralized, absorbed, and removed. Do not try to wash down the spill because that will only dilute it and then spread it.

A two component epoxy flooring overlayment and coating system has worked pretty well for our facilities and users of this product. One supplier of such a coating is Petra Industrial Polymers (

http://www.petraindustrialpolymers.com/products.html).

We have had goood succcess with their Core-Kote HB product.