表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
カソード分極に伴う50.9at%Ni-Ti合金の水素脆化
羽木 秀樹水野 誠伊部 壽夫
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1997 年 48 巻 8 号 p. 826-831

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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 DH 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. DH was calculated from the polarization time dependence of the hydrogen content, and the temperature dependence of DH was obtained to be DH=257×10-7(m2/s) exp (-382(kJ/mol)/RT). 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.

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