Abstract
The permeation properties of molybdenum coatings deposited as hydrogen diffusion barriers are studied. Absorption-desorption experiments with molybdenum-coated nickel substrates (previously published) are quantitatively interpreted using a non-steady-state analytical solution, developed in detail in a companion paper. Given the known solubility and diffusion coefficient of hydrogen in nickel, the effective permeation constant of the molybdenum coating is measured to be (8.4 ± 2.5) × 10 −16 and (37 ± 13) × 10 −16 m 2 s −1 at at −1 at 350 and 450 °C, respectively. Surface and interface effects are evident. While performing rather well as hydrogen diffusion barriers, the coatings exhibit about 9 (at 450 °C) or 17 (at 350 °C) times less protection than expected from literature diffusion data for bulk molybdenum. The relatively low efficacy of the molybdenum coating is attributed to material microdamage resulting from high internal stress.
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