Metallurgical Transactions

, Volume 5, Issue 5, pp 1199–1206 | Cite as

Hydrogen transport through annealed and deformed armco iron

  • A. J. Kumnick
  • H. H. Johnson
Transport Phenomena
Received:

Abstract

The effect of deformation and annealing on hydrogen transport through Armco Iron H.P. membranes was studied with an electro-chemical flux monitoring technique sensitive to 6 × 1010 atoms H/cm2-s. Hydrogen entry was effected by cathodic polarization at 1.8 mA/ cm2 in a 0.1 N sodium hydroxide solution. Steady state hydrogen transport at 300 K was virtually independent of processing history. The activation energy for permeation through annealed iron was 9.4 ± 0.5 kcal/mol, in reasonable agreement with previous results at higher temperatures. Two types of hydrogen traps were indicated by transient measurements on membranes with different processing histories. Type 1 traps could not be removed by annealing and are therefore thought to be deformation-induced microvoids. They explain the thickness-dependent diffusivities observed with annealed iron membranes in this and several earlier investigations. In agreement with this suggestion, membranes chemically reduced in thickness exhibited higher diffusivities than those mechanically reduced prior to annealing. Type 2 traps are also caused by deformation, but anneal out in the recovery range by a process which is not singly activated. These traps are not readily explained in terms of the stress field of a single dislocation and are probably associated with some feature of the dislocation cell structure caused by deformation.

Keywords

Effective Diffusivity Cathodic Polarization Absorption Transient Trap Density Armco Iron 
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Copyright information

© American Society for Metals, The Melallurgical Society of AIME 1974

Authors and Affiliations

  • A. J. Kumnick
    • 1
  • H. H. Johnson
    • 1
  1. 1.Department of Materials Science and EngineeringCornell UniversityIthaca

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