Features of the occurrence of electrochemical processes in contact of sodium chloride solutions with the surface of superhydrophobic coatings on titanium |
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| Authors: | S V Gnedenkov S L Sinebryukhov V S Egorkin D V Mashtalyar A M Emel’yanenko D A Alpysbaeva L B Boinovich |
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| Institution: | 1.Institute of Chemistry, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia;2.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | A joint analysis of the results of electrochemical studies and the evolution of the parameters of a sodium chloride solution
droplet in contact with the coating under test reveals the pattern of changes in the surface state which result from the electrochemical
reactions and adsorption-desorption processes at the coating/electrolyte interface. Features of the corrosion process are
studied on titanium samples with different protective layers on the surface: (1) a natural oxide, (2) a coating prepared via
plasma electrolytic oxidation (PEO coating), (3) a PEO coating with a hydrophobic layer, and (4) a PEO coating with a superhydrophobic
nanocomposite layer. The best protective properties in a chloride-containing electrolyte are exhibited by the superhydrophobic
nanocomposite coating. The mechanism of corrosion protection of this coating is formulated. |
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