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Pulsed electrodeposition of microcrystalline chromium from trivalent Cr-DMF bath

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Abstract

Pulsed electrodeposition (PED) with square wave has successfully been applied to deposit microcrystalline chromium from Cr-dimethylformamide (DMF) bath. The influence of the duty cycle, on-time, off-time, frequency, and pulse peak current on thickness, current efficiency, and hardness were investigated. Based on the analysis of the microstructure, the corrosion behavior of both direct-current deposited (DCD) and pulse-current deposited (PED) chromium in 3.5% NaCl solution was studied using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results indicated that both pulsed electrodeposits and direct-current deposits have high charge transfer resistance R ct and very low I corr compared with mild-steel substrate.

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Acknowledgements

One of the authors (Dr S. Mohan) thanks the Department of Science and Technology New Delhi for a research grant under SERC (Engineering Sciences) scheme no. SR/S3/ME/047/2005.

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  1. Central Electrochemical Research Institute, Karaikudi, 630006, India

    G. Saravanan & S. Mohan

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  1. G. Saravanan
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  2. S. Mohan
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Correspondence to S. Mohan.

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Saravanan, G., Mohan, S. Pulsed electrodeposition of microcrystalline chromium from trivalent Cr-DMF bath. J Appl Electrochem 39, 1393–1397 (2009). https://doi.org/10.1007/s10800-009-9816-3

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  • DOI: https://doi.org/10.1007/s10800-009-9816-3

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