Diffusive transport parameters and surface rate constants of deuterium in Incoloy 800

A gas permeation technique has been used to obtain the complete set of deuterium transport parameters in Incoloy 800 with deuterium driving pressures ranging from 104 to 1.5×105 Pa and temperatures from 427 to 780 K. The deuterium diffusive transport parameters obtained are: D (m2 s−1)=3.87×10−7exp(−47.8 (kJ mol−1)/RT), Ks (mol m−3 Pa−1/2)=0.102exp(−7.8 (kJ mol−1)/RT), Φ (mol m−1 s−1 Pa−1/2)=3.94×10−8exp(−55.6 (kJ mol−1)/RT). The deuterium surface rate constants for a non-oxidized surface has been evaluated as: σk1 (mol m−2 s−1 Pa−1)=2.67×10−10exp(−40.1 (kJ mol−1)/RT), σk2 (mol−1 m4 s−1)=2.58×10−8exp(−24.5 (kJ mol−1)/RT), and for an oxidized surface: (σk1)′ (mol m−2 s−1 Pa−1)=4.14×10−6exp(−44.3 (kJ mol−1)/RT), (σk2)′ (mol−1 m4 s−1)=4.00×10−4exp(−28.6 (kJ mol−1)/RT).