INFLUENCE OF SODIUM SACCHARINATE ON THE MICOTARDNESS OF NICKEL OBTAINED BY ELECTROEXTRACTION FROM METHANE SULFONATE SOLUTION
DOI:
https://doi.org/10.35546/kntu2078-4481.2026.2.14Keywords:
methanesulfonate solution, nickel, microhardness, sodium saccharinate, structure, electroextractionAbstract
Recycling of heat-resistant alloys is a key link in the production of strategically important materials. Of particular importance for the defense industry are nickel superalloys used in the manufacture of aircraft turbine parts. The alloy components are transferred into solution in an acidic environment, after which individual components are sequentially isolated from the resulting solution. The most effective method for obtaining high-purity metals is considered to be electroextraction from a leaching solution. A promising leaching agent with high solubility in relation to salts of components of heat-resistant alloys is methanesulfonate solution. Methanesulfonic acid is electrochemically inert in a wide potential window, which makes this leaching agent acceptable for organizing the electroextraction process.
The work investigated the effect of sodium saccharinate on the microhardness of nickel obtained from methanesulfonate leaching solution. The results were compared for methanesulfonate and sulfate solutions of nickel electroextraction. It was found that increasing the concentration of sodium saccharinate from 0.05 to 2 mmol/l in methanesulfonate leaching solution leads to an increase in the microhardness of nickel from 180 to 310 kg/cm2. It was shown that the microhardness increases with a decrease in the electrolysis temperature from 333°K to 313°K. An increase in the current density of nickel electrodeposition from 2 A/dm2 to 7 A/dm2 leads to a decrease in the microhardness values. The latter is associated with a decrease in the influence of sodium saccharinate on the structure of nickel due to a decrease in its surface concentration at high electrodeposition current densities. An increase in the electrodeposition current density leads to an accelerated renewal of the cathode surface and diffusion difficulties in transporting sodium saccharinate to the surface of the deposited nickel. It has been established that the microhardness of nickel obtained in the presence of sodium saccharinate from a methanesulfonate solution exceeds the microhardness of nickel obtained from a sulfate solution. It has been shown that the increase in the microhardness of electrodeposited nickel is due to a decrease in the size of its crystallites.
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