Abstract
It is found that codeposition of nickel and cobalt with alloy formation from methanesulfonate electrolyte occurs with predominant cobalt deposition. The crystalline alloy structure is considerably dis� torted as compared to pure alloyforming metals. It is shown that a significant effect on the structure and properties of nickel-cobalt deposits is produced, apart from the alloy composition, by the current density of coating deposition. Comparison of dependences of the alloy composition on current density for methane� sulfonate and sulfate electrolytes indicates a smaller change in the content of components in deposits obtained from methanesulfonate electrolyte. The observed small deviations from the constant value of the composition of the Ni-Co alloy deposited from methanesulfonate electrolyte in the current density range of 1-7 A/dm 2 together with large microhardness values characteristic for these coatings point to extensive pros� pects of application of methanesulfonate electrolytes for deposition of nickel-cobalt alloys.
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