Diffusion, Permeation and Solubility of Hydrogen in Copper

The thermodynamic description for the Cu-H system has been updated. The solubility of hydrogen in copper at low temperature has been backwards calculated from permeability data. The solubility, diffusivity, and permeability of hydrogen in copper can be described by single Arrhenius expressions. These expressions are given below. The temperature dependence of both solubility and diffusivity will together yield a strong temperature dependency on the permeability. The possibility for hydrogen transport in copper is therefore limited at low temperature. $$\begin{aligned} & {\text{Diffusivity}}:D_{{{\text{H}},{\text{Cu}}}}^{\text{FCC}} = 1.74 \times 10^{ - 6} \exp \left( { - \frac{42000}{RT}} \right){\text{m}}^{2} /{\text{s}} \\ & {\text{Solubility}}:C_{{{\text{H}},{\text{Cu}}}}^{\text{FCC}} = 5.8 \times 10^{ - 3} \exp \left( { - \frac{48550}{RT}} \right) \\ & {\text{Permeability}}:P_{{{\text{H}},{\text{Cu}}}}^{\text{FCC}} = 4.5 \times 10^{ - 4} \exp \left( { - \frac{84320}{RT}} \right){\text{mole}}\,{\text{H}}_{2} /{\text{m}}\,{\text{s}}\,{\text{atm}}^{ - 0.5} \\ \end{aligned}$$