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Recommend coating

Recommend coating

Recommend coating

(OP)
I will need to coat the inside of a vessel operating under vacuum.  The protection required is for HCL (Hydrochloric acid) and temperatures to around 300 F.

Does any body have a recommendation for the coating to use for this application.  The vessel surface to be coated is Stainless Steel.

Any help would be greatly appreciated

RE: Recommend coating

Take a look at Phenolic coatings such as Heresite http://www.heresite.com/

Vita sine litteris mors est.

RE: Recommend coating

Wouldn't the HCl be a gas rather than a liquid?

Why SS? If it ever gotwet then the pitting and stress cracking would be real isses.

RE: Recommend coating

Take a look as well at a start up company providing zirconia ultra thin film coatings: www.cccintl.com

RE: Recommend coating

From the Chemical Resistance Guide for plastics at http://www.us.piping.georgefischer.com/external/chemical_resistance_guide/chart/material_type3/chart_328.html

PTFE, Polytetrafluoroethylene (aka TeflonTM) seems best. Be sure that it's non-porous, either well-fused or a double layer.
 
For seals, a perfluoroelastomer (Chemraz® Greene, Tweed & Co.) is recommended. http://www.us.piping.georgefischer.com/external/chemical_resistance_guide/chart/material_type1/chart_328.html

As noted above, stainless has little resistance to HCl.  Tantalum & zirconium are much, much better.

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