Electrocrystallization regularities of hard Ni-Co and Ni-Co-P alloys for strengthening of parts of emergency rescue equipment
DOI:
https://doi.org/10.33408/2519-237X.2026.10-2.190Keywords:
composite strengthening coatings, electrochemical deposition of protective films, overcoming cathodic passivation, alloy formation conditions, controlled regulation of component contentAbstract
Purpose. To study the patterns and determine the optimal conditions for hydrometallurgical synthesis of protective and strengthening coatings from Ni-Co and Ni-Co-P alloys for modification surface of emergency rescue equipment parts.
Methods. Gravimetry, voltammetry, X-ray spectral analysis.
Findings. It was determined that within the permissible range of current densities (1–6 A/dm²) and a fairly wide temperature range (up to 40 °C), the deposition of Ni-Co alloys proceeds without thickness limitations, indicating the absence of cathodic passivation. For Ni-Co-P, the optimal method for obtaining dense, defect-free protective films is alloy deposition at room temperature in the current density range of 3–7 A/dm² at a rate of 30–60 μm/h. The nickel content in coatings can vary between 35 and 75 at. %; the cathode current density has the predominant influence on the nickel content in the alloy. The formation of the Ni-Co alloy occurs without some depolarization of cobalt, in the absence of limiting diffusion currents and cathode passivation. For the Ni-Co-P alloy, significant depolarization of both cobalt and nickel is observed due to their additional reduction by hypophosphite, which significantly increases the rate of coating formation compared to Ni-Co.
Application field of research. Protection against wear and corrosion, increased resistance to impact and thermal loads, friction, and deformation of parts made of low-carbon steels.
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