Abstract
A correlation between the effect of crown ether on the electrodeposition of a Cu-Cd alloy from perchlorate aqueous-ethanol baths and the liquid phase composition was found. The best inhibition by crown ether was found to occur in a range of the water structure stabilization by ethanol molecules (where the desalting effect of the mixed solvent ensures the maximum adsorption of additive molecules). An increase in the surface concentration of ClO −4 anions, as well as in the size of discharging metal complexes (because of their selective solvation in ranges of partially loosened structure of the mixture and the ethanol structure stabilized by monomer water molecules), usually reduces the effectiveness of crown ether. Varying the composition of aqueous-ethanol solvent makes it possible to regulate the content of the electrochemically negative component in the alloy, thus affecting the tribotechnical characteristics of the resulting coatings.
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