Abstract
Voltammetric and impedance techniques are used to determine the protective ability of chromium coatings deposited on a steel substrate from sulfate and methanesulfonate electrolytes based on trivalent chromium. It is found that chromium deposits obtained from methanesulfonate electrolyte have lower porosity and higher protective ability as compared with deposits from sulfate electrolyte. It is shown that, when the thickness of chromium coatings reaches 15 μm, there are no through pores in deposits for both electrolytes and, thus, the maximum degree of protection of the steel support is achieved in an aggressive medium. An equivalent circuit correctly modeling the corrosion-electrochemical behavior of the studied system is proposed on the basis of data of electrochemical impedance spectroscopy, and the values of its parameters are calculated.
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Original Russian Text © F.I. Danilov, V.S. Protsenko, A.A. Kityk, 2014, published in Fizikokhimiya Poverkhnosti i Zashchita Materialov, 2014, Vol. 50, No. 5, pp. 553–560.
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Danilov, F.I., Protsenko, V.S. & Kityk, A.A. Estimation of the protective ability of chromium coatings deposited from sulfate and methanesulfonate electrolytes based on Cr(III). Prot Met Phys Chem Surf 50, 672–678 (2014). https://doi.org/10.1134/S2070205114050074
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DOI: https://doi.org/10.1134/S2070205114050074