EIS study of the codeposition of SiC powder with nickel in a Watts bath

The results of impedance investigations of the nickel electrocrystallisation from the Watts baths (with additions of a wetting substance - sodium dodecyl sulphate and of brightening components 2-butyne-1, 4-diol and saccharine), containing SiC powder are presented. The suggested equivalent circuit consists of three resistance and two capacitance elements. The influence of organic additions and silicon carbide powder on the electrolyte resistance (R1), the charge transfer resistance (R3), the desorption resistance (R4), the double layer capacitance (C2) and the pseudo-capacitance (C5) of adsorbed intermediates has been established.