Logistic Model of Ligand Selection for Chromium-Plating Electrolytes Based on Cr(III) Complexes |
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Authors: | Vinokurov E G Demidov A V Bondar' V V |
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Institution: | (1) Mendeleev University of Chemical Technology, Miusskaya pl. 9, Moscow, 125047, Russia;(2) All-Russian Institute of Scientific and Technical Information, Baltiiskaya ul. 14, Moscow, Russia |
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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: pK
1 < 4.0 and 4.0 < pK
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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