Hydrogen coevolution and permeation in nickel electroplating

  • Mirkova L
  • Maurin G
  • Monev M
 et al. 
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Abstract

Nickel coatings were electrodeposited onto a steel membrane in a
conventional Devanathan cell in order to measure the diffusion rate of
hydrogen into the steel substrate during electrodeposition. In most
cases a Watts' solution containing various organic additives was used:
butyne-2 diol-1, 4; saccharine or thiourea. The structure of the
electrodeposits was studied by X-ray and Transmission electron
microscopy (TEM). It was shown that the electrodeposition parameters (
pH, composition of the bath, additives) have a strong effect on hydrogen
permeation. The use of organic additives during Ni plating increased the
penetration of hydrogen into the substrate. In particular,
sulfur-containing additives cause a fast initial increase of the
permeation rate, which is attributable to a high surface concentration
of H-ads when steel is not totally covered with nickel.
By performing permeation experiments with Ni coatings during hydrogen
charging from a H2SO4 solution, it was shown that hydrogen permeation
through nickel coatings is influenced by their fibre texture and by
their grain sizes. A low permeation rate was observed in coatings plated
in the presence of butyne-2 diol-1,4, which exhibit a strong 100 texture
with large grains and a low density of defects. Conversely, the hydrogen
diffusion rate is very high in coatings plated in the presence of
thiourea or saccharine. These coatings exhibit a weak texture with very
small grains.

Author-supplied keywords

  • Additives
  • Devanathan cell
  • Hydrogen permeation
  • Nickel electrodeposition
  • Texture

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