Assessment of hydrogen-induced precipitation in a nickel-copper alloy using thermoelectric power

Y. D. Park, D. L. Olson, A. Landau, M. Pinkas

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Hydrogen sensing using thermoelectric power (TEP) was performed on a nickel-copper alloy to assess the hydrogen content resulting from cathodic protection. The measured TEP as a function of hydrogen content developed an anomaly at a specific hydrogen content, indicating a hydrogen-induced phase transformation in the alloy. The formation of Ni2H phase was found in a hydrogen-charged alloy (UNS N05500) using x-ray diffraction (XRD). The transmission electron microscopy (TEM) investigation of the hydrogen-charged alloy specimen revealed nano-sized Ni2H participates dispersed in the nickel-copper matrix. The measured TEP profile correlated with an alloy hydride phase formation on a hydrogen-metal pressure-composition-temperature (PCT) activity diagrant. These results indicate that the TEP surface contact probe measurements can assist in the nondestructive evaluation (NDE) identification of a microstructural change in hydrogen-charged nickel-copper alloys. With this TEP surface probe measurement technique, in situ determination of the susceptibility of an alloy to hydride formation is possible.

Original languageEnglish
Pages (from-to)395-402
Number of pages8
JournalCorrosion
Volume62
Issue number5
DOIs
StatePublished - 1 Jan 2006
Externally publishedYes

Keywords

  • Evaluation
  • Hydride formation
  • Hydrogen content
  • Thermoelectric power
  • UNS N05500

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science

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