カソード分極に伴う50.9at%Ni-Ti合金の水素脆化 [in Japanese] Hydrogen Embrittlement of 50.9at%Ni-Ti Alloy Caused by Cathodic Polarization [in Japanese]
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To clarify the cause of delayed fracture of a glasses frame made of Ni-Ti alloy and to establish an appropriate countermeasure against hydrogen embrittlement, the diffusion coefficient of hydrogen <i>D<sub>H</sub></i> in a 50 9at%Ni-Ti alloy and changes in the load-elongation curve due to cathodic polarization were investigated. Cathodic polarization introduced large amounts of hydrogen. <i>D<sub>H</sub></i> was calculated from the polarization time dependence of the hydrogen content, and the temperature dependence of <i>D<sub>H</sub></i> was obtained to be <i>D<sub>H</sub></i>=257×10<sup>-7</sup>(m<sup>2</sup>/s) exp (-382(kJ/mol)/<i>RT</i>). Cathodic polarization caused hydrogen embrittlement. A marked decrease in elongation occurred as the polarization time and the aging time at room temperature after polarization increased. This is attributed to an increase in the penetration depth of hydrogen.
- Jitsumu Hyomen Gijutsu
Jitsumu Hyomen Gijutsu 48(8), 826-831, 1997-08-01
The Surface Finishing Society of Japan