Coleman, D. H., B. N. Popov, and R. E. White. 1996. “Effects of Multiple Electroplated Zinc and Zinc-Nickel Alloy Layers on Inhibition of Hydrogen Permeation through an Iron Membrane”. Proceedings of the AESF Annual Technical Conference 143: 783-802.
Abstract
Hydrogen surface coverage, exchange current density, absorption-adsorption reaction constant, and hydrogen recombination constant were estimated on bare iron and on zinc and nickel-zinc plated iron. Hydrogen evolution and permeation decreased with each successive zinc layer until finally reaching an average decrease of 93% and 96%, respectively, as compared with bare iron. It was found that the decrease in the permeation rate of hydrogen through the iron membrane was due: (i) to the decrease of hydrogen discharge rate and (ii) to the suppression of hydrogen absorption and adsorption on the deposited zinc layers. The kinetic parameters obtained from the model, along with the observation that permeation was decreased even when the cathodic current was the same (at a given cathodic potential), indicated that the decrease in permeation when zinc-nickel is plated compared to bare iron is due to a decrease in the absorption of atomic hydrogen (shown by a decrease in absorption-adsorption constant, k ). The kinetic parameters obtained from the model, along with the observation that permeation was decreased even when the cathodic current was the same (at a given cathodic potential), indicated that the decrease in permeation when zinc-nickel is plated compared to bare iron is due to a decrease in the absorption of atomic hydrogen
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