Wear-resistant chromium coatings deposited in a tetrachromate electrolyte using an inductance-capacitance device

The Dependence of Properties of the Electroplated Coatings on the Spectrum of the Variable Components of the Current (Voltage)

“…10). a b An increase in microhardness from 5.00 to 8.00 GPa using the ICD was also registered in chromium coatings as well, which were developed from tetrachromic electrolyte (CrO 3 -400 g/l, NaOH -60 g/l, H 2 SO 4 -2, 5 g/l, sugar -1g/l), which enhanced their wear resistance up to the level of the coatings deposited in the standard electrolyte without the ICD [13].…”

“…The VC spectrum was determined during the connection of the bath, which was obviously caused by the electrochemical process during the chromium deposition from the standard electrolyte (CrO 3 -250g/l, H 2 SO 4 -2,5g/l, t el -55 The same as in the earlier tests, the ICD connection affects markedly the initial VC spectrum, and at the optimal values of the parameters (L opt , C opt ) its components aligned their values up to the frequency 8 kHz. In the process of the deposition of chromium coatings from tetrachromic electrolyte (CrO 3 -400 g/l, NaOH -60 g/l; H 2 SO 4 -2,5 g/l, sugar1g/l , the electrolyte temperature was 20 -22 о С, i k -2,0 kA/m 2 , I -2 A) and using a 3-phase power supply [13], the ICD effect was vividly apparent on certain components of the spectrum (Fig. 4).…”

“…The necessary capacity was ensured by a parallel connection of electrolytic condensers, and mainly in the experiments the condenser capacity was C = 2200 mkF. For the deposition of the coating we used, as a rule, a single-phase, three-phase, six-phase and 60W switching power sources, as well as a lead accumulator [10][11][12][13][14][15].…”