Obtaining of Cо-W Coatings from Concentrated Gluconate Electrolytes

CZU 544.65

DOI  https://doi.org/10.52577/eom.2025.61.2.31

The electrodeposition and properties of the Co-W alloy obtained from concentrated gluconate electrolytes were studied. It was shown that high-quality alloy coatings with a high current efficiency are formed by variating the precursors from 0.1 M to 0.5 M at a concentration ratio of the Cit ligand and alloy-forming components Co²⁺/WO₄⁺ (5:1). Based on the results of the X-ray structural analysis, it was concluded that the Co-W alloy can be formed as a polycrystalline substitution solid solution and a thermodynamically stable Co₃W compound, which, depending on the content of the alloying element tungsten, can be either polycrystalline or finely dispersed. High values of microhardness of the alloy of 800 kg/mm² obtained at a current density of 1 A/dm² can be associated with the electrochemical deposition of the Co₃W intermetallic compound, which has a high microhardness.

Keywords: electrolyte, Co-W alloys, deposition rate, composition of alloys, microhardness, structure.