Obtaining of Cо–W Coatings from Concentrated Gluconate Electrolytes

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 to 0.5 M at a concentration ratio of the Cit ligand and alloy-forming components $${\text{C}}{{{\text{o}}}^{{2 + }}}{\text{/WO}}_{4}^{{ - 2}}$$ of 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 substitutional 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.