H2S affect on Samarium Cobalt & Coating

[cermag]

I am trying to research whether a FBE (Fusion Bonded Epoxy) coating would help prevent corrosion of samarium cobalt in deep bore conditions with H2S (Hydrogen Sulfide) - assuming concentration of between 5% - 30%.

Any info gratefully received.

 

[EdStainless]

What is the permeability of the epoxy to H2S?
Is this a dry (gas only) application or is there water and oil present also? This will not be a garden variety of epoxy.

I would rather go with a solvent-less liquid system since there will be less chance for porosity.
You could look at FBE in two coats. Holidays are what will kill you.

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Plymouth Tube

 

[MagnetDave]

I would look at a phenolic resin, rather than an epoxy in this case. Or, if that's not enough, a parylene.

Those will give you the best chemically inert seal.