Abstract
The electrocrystallization of Ni is known to be a highly inhibited process. This work gives some conclusions about the nature of the major inhibiting species. All of these species are formed in the catholyte because of the hydrogen codeposition. Depending on plating conditions, mainly pH and current density of metallic deposition, we observe a predominancy of a definite inhibitor which selectively promotes one mode of growth and leads to a deposit exhibiting definite structural properties. A careful structural investigation of Ni deposits obtained from a Watts solution, thanks to both X-ray diffractometry and electron-microscope techniques, leads us to distinguish a free mode of growth, which is characterized by [100] oriented deposits, from several inhibited modes such as 〈110〉, [210], 〈211〉 and 〈111〉. The two latter are stabilized by Ni(OH)2 while the two former are respectively due to atomic and molecular forms of adsorbed hydrogen.
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Amblard, J., Epelboin, I., Froment, M. et al. Inhibition and nickel electrocrystallization. J Appl Electrochem 9, 233–242 (1979). https://doi.org/10.1007/BF00616093
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DOI: https://doi.org/10.1007/BF00616093