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 language | English |
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Pages (from-to) | 395-402 |
Number of pages | 8 |
Journal | Corrosion |
Volume | 62 |
Issue number | 5 |
DOIs | |
State | Published - 1 Jan 2006 |
Externally published | Yes |
Keywords
- Evaluation
- Hydride formation
- Hydrogen content
- Thermoelectric power
- UNS N05500
ASJC Scopus subject areas
- General Chemistry
- General Chemical Engineering
- General Materials Science