Title: An electrochemical approach to evaluating surface coatings

Authors: Hulya Demiroren; Soner Buytoz

Addresses: Department of Material Science and Engineering, Faculty of Engineering, Canakkale Onsekiz Mart University, Canakkale, Turkey ' Faculty of Technology, Materials and Metallugy Engineering, Firat University, Elazig, Turkey

Abstract: In order to understand the influence of metal carbides and niobium carbides on electrochemical behaviour of Fe-based composite powder and FeNb powder coatings were added. Above mentioned composite layer was prepared on a medium carbon steel surface by using GTAW coating technique. The morphology of the coatings' surface was analysed by optical microscope, scanning electron microscope (SEM) equipped with an energy-dispersive spectroscopy (EDS) and X-ray diffractometer (XRD). Then the samples were exposed to seawater. Electrochemical impedance spectroscopy (EIS) method with triple electrode system was used in order to obtain Bode and Nyquist diagrams. Ag/AgCl electrode is used as reference electrode, and platin plate is counter electode in this system. As a result, adding NbC has harmful effect on the electrochemical behaviour of FeCrC coating powder.

Keywords: Fe-based composite; Cr7C3 carbide; NbC carbide; EIS; Nyquist plot.

DOI: 10.1504/IJSURFSE.2021.120962

International Journal of Surface Science and Engineering, 2021 Vol.15 No.4, pp.294 - 306

Received: 14 May 2021
Accepted: 16 Jul 2021

Published online: 18 Feb 2022 *

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