Water-acetonitrile ratio in perchlorate cadmium bath and the effectivenessof the addition of crown-ester

It is shown that the strongest deceleration of the electrodeposition of cad mium in inhibited media is observed in the domain of loosening the structur e of a mixed solvent (0.45 greater than or equal to x(2) greater than or eq ual to 0.25) when the molecular adsorption of organic solvent on Cd is maxi mum. The process is maximally facilitated in the domain of ordering the ace tonitrile's (AN) structure (0.9 greater than or equal to x(2) greater than or equal to 0.75), where perchlorate anions dominate at the cathode surface . Crown-ester exhibits maximum inhibition effect under the conditions of pr eferential adsorption of its molecules, i.e., in the domain of the prevalen ce of the nonaqueous component in the mixture (x(2) greater than or equal t o 0.95).