Effect of Crown Ether on the Electrodeposition of a Copper
Cadmium Alloy from Aqueous
Ethanol Perchlorate Baths
V. V. Kuznetsov, L. M. Skibina, and S. V. Geshel’
Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia
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Received November 23, 2004
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 
anions, as well as in the size of discharging metal complexes (because of their selectivesolvation in ranges of partially loosened structure of the mixture and the ethanol structure stabilized by mono-mer water molecules), usually reduces the effectiveness of crown ether. Varying the composition of aqueousethanol solvent makes it possible to regulate the content of the electrochemically negative component in thealloy, thus affecting the tribotechnical characteristics of the resulting coatings.
anions, as well as in the size of discharging metal complexes (because of their selectivesolvation in ranges of partially loosened structure of the mixture and the ethanol structure stabilized by mono-mer water molecules), usually reduces the effectiveness of crown ether. Varying the composition of aqueousethanol solvent makes it possible to regulate the content of the electrochemically negative component in thealloy, thus affecting the tribotechnical characteristics of the resulting coatings.