Abstract
The effect of the ligand nature in chromium(III) complexes on chromium electrodeposition was studied. The predicting logistic model of ligand selection for chromium-plating electrolytes was constructed from experimental data. It was found that high-quality chromium coatings can be deposited from electrolytes of chromium(III) complexes with a ligand having the following acid-basic characteristics in the protonated form: p K 1 < 4.0 and 4.0 < Σ p K n < 18.6. The proposed model was verified experimentally and used to prepare a chromium-plating electrolyte based on a chromium(III) malonate complex, which gives high-quality chromium coatings over a wide current density range.
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