Wet H2S vs Sulfidation
Wet H2S vs Sulfidation
(OP)
Dear all,
I have been trying to understand the exactly difference between this two damage mechanisms: sulfidation and wet H2S damage.
I was wondering; if sulfidation occurs mostly due to H2S and the main reaction is Fe+ + e- + HS- + H+ --> FeS + 2H
and this reaction is the same as the main reaction in wet H2S mechanism, why isn't a concern the atomic Hydrogen difussion in sulfidation conditions?
Thanks in advance.
I have been trying to understand the exactly difference between this two damage mechanisms: sulfidation and wet H2S damage.
I was wondering; if sulfidation occurs mostly due to H2S and the main reaction is Fe+ + e- + HS- + H+ --> FeS + 2H
and this reaction is the same as the main reaction in wet H2S mechanism, why isn't a concern the atomic Hydrogen difussion in sulfidation conditions?
Thanks in advance.





RE: Wet H2S vs Sulfidation
Nathan Brink
RE: Wet H2S vs Sulfidation
Sulfidation will occur under either oxidizing or reducing conditions and is worse when combined with Na, Cl, P and other fuel impurities.
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P.E. Metallurgy, Plymouth Tube
RE: Wet H2S vs Sulfidation
I understand that because of the temperature you wont have aqueous phase.
NBrink said that at those temperatures hydrogen difussion rate is great enough yo don't charge the Steel.
But assuming you have a poor quality Steel with discontinuities such as laminations or inclusions, won't be blistering a concern?
If you have wet H2S, the difussion rate would be a direct indicator of the probability of that damage occur. Or am I wrong?
RE: Wet H2S vs Sulfidation
At high temp hydrogen won't collect, it diffuses too easily.
Now if the back side of the steel is cold that is different, because at some depth the H wants to stop moving freely.
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P.E. Metallurgy, Plymouth Tube