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Electrodeposition of nanocrystalline chromium-carbon alloys from electrolyte based on trivalent chromium sulfate using pulsed current

  • Nanoscale and Nanostructured Materials and Coatings
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Abstract

The effect of the parameters of pulsed electrolysis on the current efficiency, nanocrystal size, composition, hardness, friction coefficient, and wear resistance of nanocrystalline Cr-C coatings obtained from electrolyte based on Cr(III) sulfate containing carbamide and formic acid is studied. It is shown that coatings contain ∼9 wt % of carbon; the current density and pulse ratio produce practically no effect on their composition. It is found that a maximum appears on the dependence of current efficiency on pulse ratio in the case of the pulse ratio of ∼1.05–1.1. Thereby, current efficiency greatly exceeds the value implemented in the steady-state current mode. It is shown that, if the microhardness of Cr-C deposits obtained at constant current is close to 850–900 HV, the microhardness may increase to ∼1200−300 HV when pulsed electrolysis is used in certain modes. It is found that application of pulsed electrolysis allows a significant decrease in the friction coefficient of chromium-carbon coating (steel counterbody) both under the dry friction conditions and in the case of boundary lubrication and also results in an increase in the deposit wear resistance.

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Correspondence to F. I. Danilov.

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Original Russian Text © F.I. Danilov, V.S. Protsenko, V.O. Gordiienko, A.S. Baskevich, V.V. Artemchuk, 2012, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2012, Vol. 48, No. 3, pp. 280–285.

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Danilov, F.I., Protsenko, V.S., Gordiienko, V.O. et al. Electrodeposition of nanocrystalline chromium-carbon alloys from electrolyte based on trivalent chromium sulfate using pulsed current. Prot Met Phys Chem Surf 48, 328–333 (2012). https://doi.org/10.1134/S2070205112030057

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  • DOI: https://doi.org/10.1134/S2070205112030057

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