The permeation and diffusion of hydrogen and deuterium through Rodar, tin−coated Rodar, and solder−coated Rodar

摘要: The permeation and diffusion of H2 D2 through Rodar (an Fe−Ni−Co alloy), the Niromet−42 Fe−Ni alloy) have been measured by a membrane technique. In range 180−550°C, coefficients for are: KH2 = 4.9×10−3 exp(−13500/RT) cm3 (STP) sec−1 cm−1 atm−1/2, DH2 6.3×10−3 exp(−11100/RT) cm2 sec−1, KD2 4.8×10−3 exp(−13900/RT), DD2 2.6×10−3 exp(−10300/RT), Niromet 3.4×10−3 exp(−13600/RT), where R 1.987 cal mole−1 deg−1. Deuterium permeability measurements indicate that coatings tin or tin−lead solder are very effective barriers. At temperatures below 170°C, either coating has is approximately five orders magnitude less than an equivalent thickness Rodar. However, conventional application with organic flux will injet ∠5×10−4 hydrogen/cm2 soldered Dependent on thermal environment, injected hydrogen can diffuse react available o...