Accurate measurement of hydrogen diffusivity in metals

David J. Pine, R. M. Cotts

Research output: Contribution to journalArticle

Abstract

An accurate resistiometric technique for measuring fast diffusion of hydrogen in metals is described. The sample is in the form of a foil having uniform cross section and a length much greater than its width. Samples are electrolytically loaded with hydrogen to about 0.5 atomic percent. Initially the hydrogen is held at uniform concentration in essentially half the length of the foil by the effect of a dc electrotransport current of 2500 A/cm2 in the other half. After this current is removed, the diffusion of hydrogen into the second half is monitored by its effect on the resistance of a small section of the foil. With this technique a single sample may be reused to make many measurements of D. The measurement of D is absolute, and use of a sensitive differential ac measurement yields results for low hydrogen concentrations.

Original languageEnglish (US)
Pages (from-to)614-616
Number of pages3
JournalReview of Scientific Instruments
Volume55
Issue number4
DOIs
StatePublished - 1984

ASJC Scopus subject areas

  • Instrumentation

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