TECHNOLOGICAL PARAMETERS OF GALVANICHEMICAL PROCESSES OF FORMATION OF COBALT-BASED METAL OXIDE COMPOSITES
DOI:
https://doi.org/10.15421/jchemtech.v31i2.275741Keywords:
composite coatings; electrochemical deposition; cobalt, refractory metals; conductivity; scattering ability.Abstract
Electrodeposition of composite coatings based on cobalt, including refractory metals, allows obtaining coatings with a unique combination of physicochemical properties that cannot be achieved with other coating methods. The application of high-quality electrochemical composite coatings is only possible by establishing the characteristics of the electrolyte and electrolysis parameters. The characteristics of the scattering ability and specific electrical conductivity of Co-MoOx-WOx, Co-WOx-ZrO2, and Co-MoOx-ZrO2 electrolytes for depositing cobalt-based composite coatings have been established. The electrical conductivity values of the electrolytes for depositing cobalt-based composite coatings linearly increase with the temperature of the electrolyte, but their values at 25-30°C are sufficient for the deposition of high-quality coatings. It has been determined that within the current density range of 0.5–3.0 A/dm2 for Co-MoOx-WOx and up to 4.0 A/dm2 for Co-MoOx-ZrO2 and Co-WOx-ZrO2, the scattering ability remains above 85 %. The calculated activation energy of the electrical conductivity of complex electrolytes ranges from 22 to 29 kJ/mol, indicating the occurrence of mass transfer processes in the diffusion regime. Using insoluble inert stainless steel anodes in the technological process is justified.
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