The influence of electrolyte composition on pH of nickel hydrate formation

The influence of the composition of nickel plating electrolytes containing various ligands (Ac − , Gly − , and Asp 2− ) on pH of nickel hydrate formation (pH hydr ) was studied. The data obtained were interpreted from the point of view of ionic equilibria in the systems studied. The nature of sparin...

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Bibliographic Details
Published in:Russian Journal of Physical Chemistry A 2011-06, Vol.85 (6), p.1072-1076
Main Authors: Duyen, Vu Thi, Dolgikh, O. V., Sotskaya, N. V.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Colloidal Chemistry and Electrochemistry
Physical Chemistry
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Summary:The influence of the composition of nickel plating electrolytes containing various ligands (Ac − , Gly − , and Asp 2− ) on pH of nickel hydrate formation (pH hydr ) was studied. The data obtained were interpreted from the point of view of ionic equilibria in the systems studied. The nature of sparingly soluble precipitates formed in these electrolytes when pH hydr was reached was determined. Sparingly soluble precipitates were found to be pure Ni(OH) 2 hydroxides or basic salts with the composition Ni(OH) n Cl 2 − n , in which the content of chloride ions increased as the concentration of NiCl 2 grew. Organic substance anions were absent in the precipitates formed and only influenced pH hydr through changes in the concentration of free nickel ions as a result of complex formation. A principle of selecting the composition of nickel plating electrolytes was suggested on the basis of the results obtained.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024411060343