Abstract
Polarization studies showed that an increase in the crown ether content in a sulfate nickel-plating electrolyte results in a considerable increase in polarization of the cathodic process, a decrease in the current efficiency of metal and its deposition rate, and an improvement of the coating quality (adhesion, microhardness, uniformity, fineness of structure). Introduction of N-methylpyrrolidone (MP) into sulfate electrolyte decreases the efficiency of 15-crown-5: polarization curves are shifted into the region of less negative values, electrochemical control of the process is replaced by diffusion control. The appearance of the coating changes in the presence of ɛ-caprolactam (CL): it becomes more even and uniform, but contains microcracks indicating the presence of internal stresses in the deposit. The possibility of effective regulation of the deposition rate, microstructure, and properties of organonickel coatings through changing the bulk concentration of the crown ether, MP, and CL is shown.
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Original Russian Text © L.M. Skibina, E.I. Burdina, A.I. Sokolenko, 2014, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2014, Vol. 50, No. 5, pp. 539–546.
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Skibina, L.M., Burdina, E.I. & Sokolenko, A.I. Regularities of the effect of cyclic polyether on the microstructure, kinetics of deposition, and some properties of nickel and organonickel coatings. Prot Met Phys Chem Surf 50, 643–649 (2014). https://doi.org/10.1134/S2070205114050165
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DOI: https://doi.org/10.1134/S2070205114050165