Role of complexation in forming composition of Co-W coatings electrodeposited from gluconate electrolyte

The purpose of the given research has been to specify the route of formation of Co-W coatings. To this end, the gel-chromatographic separation of gluconate electrolyte has been used, as well as the photo-colorimetric determination of the composition of the separation products, and the evaluation of the electro-chemical activity of these complexes in the pH range of 4.0 to 8.0. As a result, it has been found out that the composition of the Co-W coatings thus formed is defined by the relation of the rates of the reduction of those heterometallic complexes (with the Co-W ratio 1: 1) and Co complexes in solution, as well as the reaction of hydrogen reduction, dependent on both the electrolyte pH and hydrodynamic conditions.