Abstract
The kinetics of anode process occurring in ‘Chromispel‐C’, a non‐standard chloride electrolyte for chromium plating has been studied. The anodes investigated were prepared from platinum, silver, lead, Pb–Ca (0·11%Ca) alloy and M10 and P25 ceramal alloys. The processes occurring at the anode have been identified. The distribution of the total current among anode reactions was also established. The effects of electrolyte concentration, anode material, current density and temperature on current distribution were studied. The potentiodynamic polarisation curves were recorded under varying operational conditions of chromium plating and the general I versus E dependence established. The values of the corresponding corrosion potentials Ec, potentials E1 and E2, as well as the limiting currents I1 and I2 for the first and second step of the I versus E curve have been determined. The activation energy was calculated using the temperature kinetic model and the mechanism of electrode polarisation established. Platinum (and later, for economical practical reasons, platinised titanium) and P25 ceramal alloy are recommended as suitable anode materials.
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