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08409 New Insights into Hydrogen Permeation in Steels: Measurements Through Thick Membranes

Picture for 08409 New Insights into Hydrogen Permeation in Steels: Measurements Through Thick Membranes
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Product Number: 51300-08409-SG
ISBN: 08409 2008 CP
Author: Jean Kittel, Francois Ropital, and Julie Pellier
Publication Date: 2008
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The permeation of hydrogen in steel in the presence of acid gases is not a simple phenomenon as the steel may contain trapping sites and also because the permeation may be governed by surface reactions associated with corrosion. Recently, hydrogen permeation experiments carried out at corrosion potential have shown a constant flux for various membrane thicknesses in the range 0.05 – 0.8 mm. This is in apparent contradiction with the Fick's laws of diffusion, predicting a diffusion flux inversely proportional to the thickness of the membrane. Such results confirm the possibility for permeation to be governed by surface reaction and not by the diffusion through steel: this situation corresponds to a thin membrane case.
The permeation of hydrogen in steel in the presence of acid gases is not a simple phenomenon as the steel may contain trapping sites and also because the permeation may be governed by surface reactions associated with corrosion. Recently, hydrogen permeation experiments carried out at corrosion potential have shown a constant flux for various membrane thicknesses in the range 0.05 – 0.8 mm. This is in apparent contradiction with the Fick's laws of diffusion, predicting a diffusion flux inversely proportional to the thickness of the membrane. Such results confirm the possibility for permeation to be governed by surface reaction and not by the diffusion through steel: this situation corresponds to a thin membrane case.
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