Steady state hydrogen transport through zone refined irons
- Cite this article as:
- Kumnick, A.J. & Johnson, H.H. MTA (1975) 6: 1087. doi:10.1007/BF02661363
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Hydrogen permeation from the gas phase through zone refined iron was measured with the electrochemical technique over 0 to 60°C and 0.01 to 1 atm. The surface impedance problems normally encountered in this pressure-temperature range were eliminated by a thin layer of electroplated palladium on the input surface of the permeation membrane. The steady state flux was propprtional to the square root of the pressure and inversely proportional to the membrane thickness. The permeability coefficient was 2.6 × 1017 exp ((-8500 ± 600 cal/mole deg)/RT) atom H/cm s atm1/2, in good agreement with earlier results at higher temperatures. These results can be used to calibrate electrochemical charging experiments in terms of an effective hydrogen pressure.