Abstract
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 diagram. 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 techni...
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