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Hydrogen concentration gradients in cathodically charged austenitic stainless steel

Published online by Cambridge University Press:  31 January 2011

D. G. Ulmer  and
C. J. Altstetter
D. G. Ulmer
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
C. J. Altstetter
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801
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Abstract

An x-ray diffraction technique has been developed to make in-situ measurements of hydrogen concentration profiles from which diffusivity and solubility values are calculated. Hydrogen is supplied to the metal surface by cathodically polarizing it in a bath of 1N H2SO4 electrolyte. The incident x-ray beam penetrates a thin layer of electrolyte solution at the surface of the sample, thus, x-ray diffraction profile changes can be recorded as a function of charging time and temperature. The applied potential prevents outgassing of the specimen during the measurement. The x-ray diffraction profiles are deconvoluted to remove the α1/α2 doublet and noncompositional broadening effects. Composition-depth profiles are then obtained from an intensity band transformation of the deconvoluted data. A diffusion coefficient is determined by fitting a solution to Fick's second law to the concentration-depth profile. The technique described here was used to measure hydrogen diffusivity in stainless steel in the temperature range 20°–80°C.

Type
Articles
Information
Journal of Materials Research , Volume 2 , Issue 3 , June 1987 , pp. 305 - 312
Copyright
Copyright © Materials Research Society 1987

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