Advertisement

The Chemistry of Gaseous Hydrogen Embrittlement

  • H. W. Liu
  • P. J. Ficalora
Part of the Sagamore Army Materials Research Conference Proceedings book series (SAMC, volume 26)

Abstract

The chemical reactions of gaseous hydrogen on nonsurfaces have been determined by volumetric and magnetization adsorption experiments. It has been found that the process involves the formation of a chemisorbed molecular hydrogen ion (H2 +) prior to the formation of the atomic embrittling ion (H-). At low temperatures (77K), the kinetics and equilibrium isotherm clearly show the equilibrium between the two adsorbed species is dominated by the molecular ion. As the temperature is increased the concentration of the embrittling ion increases and reaches a maximum at approximately room temperature. Above room temperature the desorption of the molecular ion and hence the decrease in concentration of the embrittling ion becomes the dominant process. The temperature dependence of slow crack growth measurements in gaseous hydrogen is explained on the basis of the above chemistry.

Keywords

Adsorption Process Crack Growth Rate Gaseous Hydrogen Hydrogen Pressure Hydrogen Embrittlement 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    L. Pecora & P. J. Ficalora: Met. Trans. A, 1977, vol. 8A, p. 1841.CrossRefGoogle Scholar
  2. 2.
    M. R. Shanabarger: Surf. Sci., 1975, vol. 52, p. 689.CrossRefGoogle Scholar
  3. 3.
    K. Suradzki: Ph.D. Dissertation, Syracuse University, Syracuse, N.Y., 1978.Google Scholar
  4. 4.
    C. M. Ransom & P. J. Ficalora: Met. Trans. A, 1980, vol. IIA, p. 801.Google Scholar
  5. 5.
    D. P. Williams & H. G. Nelson: Met. Trans., 1970, vol. 1, p. 63.Google Scholar
  6. 6.
    R. P. Gangloff & R. P. Wei: Met. Trans. A, 1977, vol. 8A, p. 1043.CrossRefGoogle Scholar
  7. 7.
    H. G. Nelson, D. P. Williams and A. S. Tetelmann: Met. Trans., 1971, vol. 2, p. 953.CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1982

Authors and Affiliations

  • H. W. Liu
    • 1
  • P. J. Ficalora
    • 1
  1. 1.Department of Chemical Engineering & Materials ScienceSyracuse UniversitySyracuseUSA

Personalised recommendations