Chromium electrodeposition from Cr(III) aqueous solutions |
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Authors: | Roberto Giovanardi Gianpaolo Orlando |
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Affiliation: | a University of Modena e Reggio Emilia, Department of Materials Engineering, Via Vignolese 905, 41125 Modena, Italyb Nitty-Gritty srl, Via dei Marmorari 36, 41057 Spilamberto (MO), Italy |
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Abstract: | The aim of this work is to study an alternative plating process to obtain chromium coatings through electrodeposition from baths containing trivalent chromium, as aqueous solutions of Cr (III) are significantly less dangerous, in terms of human health and environmental impact, as compared to the traditional Cr (VI) baths employed for this purpose. In order to overcome problems regarding the reduction of Cr (III) in aqueous solution, two approaches were followed: i) the possibility of co-depositing chromium along with a second metal, which could help the process of discharge of Cr3+ on the substrate; ii) the use of a specific ligand for the Cr3+ ion, which can generate easily reducible complexes at the metal-solution interphase. Both approaches led to interesting results: in particular, the co-deposition enabled us to obtain NiCr alloy with a high percentage of chromium, and the deposition using specific complexing agents allowed optimal bath compositions to be developed both for decorative and hard chromium plating. |
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Keywords: | Chromium Plating Electrodeposition Formic acid Complexes |
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