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Increasing Corrosion Resistance of Passivating Metals by Electrochemical Application of Local Nanosized Coatings

  • NANOSCALE AND NANOSTRUCTURED MATERIALS AND COATINGS
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Abstract

A method is proposed for increasing the resistance of passivated metals (in particular, stainless steels) to corrosion that is based on the use of the principle of cathodic alloying by electrolytic deposition of local palladium nanocoatings. It was found that the corrosion potential of AISI 321 steel samples in a 0.1 M NaCl solution electrochemically treated at a current density of 1 μA/cm2 and a frequency of 0.06 Hz in chloride-containing solutions with 0.1% Pd2+ shifts towards more positive values by almost 150 mV. It was also shown by scanning electron microscopy and Auger spectroscopy that, in the process of electrochemical polarization, subindividuals of a new phase (Pd) with sizes of the order of 5–80 nm are deposited on the surface of AISI 321 steel, the formation of which causes the potential improvement of the samples under study. It was found that the largest accumulation of subindividuals of the new phase (Pd) is observed in areas with artificially created surface defects (scratches).

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ACKNOWLEDGMENTS

The work was carried out on the equipment of the Center for Collective Use “Nanomaterials and Nanotechnologies” of Kazan National Research Technological University.

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  1. Kazan National Research Technological University, 420015, Kazan, Russia

    A. F. Dresvyannikov, A. N. Akhmetova & A. E. Denisov

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  1. A. F. Dresvyannikov
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  2. A. N. Akhmetova
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  3. A. E. Denisov
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Correspondence to A. F. Dresvyannikov or A. N. Akhmetova.

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Dresvyannikov, A.F., Akhmetova, A.N. & Denisov, A.E. Increasing Corrosion Resistance of Passivating Metals by Electrochemical Application of Local Nanosized Coatings. Prot Met Phys Chem Surf 57, 1165–1171 (2021). https://doi.org/10.1134/S2070205121060071

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  • DOI: https://doi.org/10.1134/S2070205121060071

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