Next Article in Journal
An Investigation of Surface Corrosion Behavior of Inconel 718 after Robotic Belt Grinding
Next Article in Special Issue
Wear Resistant Coatings with a High Friction Coefficient Produced by Plasma Electrolytic Oxidation of Al Alloys in Electrolytes with Basalt Mineral Powder Additions
Previous Article in Journal
Detection of Friction Stir Welding Defects of AA1060 Aluminum Alloy Using Specific Damping Capacity
Previous Article in Special Issue
Novel Porous Phosphorus–Calcium–Magnesium Coatings on Titanium with Copper or Zinc Obtained by DC Plasma Electrolytic Oxidation: Fabrication and Characterization
Open AccessArticle

Effects of a Carbon Nanotube Additive on the Corrosion-Resistance and Heat-Dissipation Properties of Plasma Electrolytic Oxidation on AZ31 Magnesium Alloy

Department of Materials Science and Engineering, Pusan National University, Busan 609-735, Korea
*
Author to whom correspondence should be addressed.
Materials 2018, 11(12), 2438; https://doi.org/10.3390/ma11122438
Received: 9 November 2018 / Revised: 27 November 2018 / Accepted: 30 November 2018 / Published: 2 December 2018
(This article belongs to the Special Issue Metals Functionalization via Plasma Electrolytic Oxidation)
Plasma electrolytic oxidation (PEO) coating was obtained on AZ31 Mg alloy using a direct current in a sodium silicate-based electrolyte with and without a carbon nanotube (CNT) additive. The surface morphology and phase composition of the PEO coatings were investigated through field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The corrosion-resistance properties of the PEO coatings were evaluated using potentiodynamic polarization measurements and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution. Furthermore, the heat-dissipation property was evaluated by a heat-flux measurement setup using a modified steady-state method and Fourier transform infrared spectroscopy (FT-IR). The results demonstrate that, by increasing the concentration of CNT additive in the electrolyte, the micropores and cracks of the PEO coatings are greatly decreased. In addition, the anticorrosion performance of the PEO coatings that incorporated CNT for the protection of the Mg substrate was improved. Finally, the coating’s heat-dissipation property was improved by the incorporation of CNT with high thermal conductivity and high thermal emissivity. View Full-Text
Keywords: magnesium alloy; plasma electrolytic oxidation; carbon nanotube; corrosion resistance; emissivity magnesium alloy; plasma electrolytic oxidation; carbon nanotube; corrosion resistance; emissivity
Show Figures

Figure 1

MDPI and ACS Style

Hwang, M.; Chung, W. Effects of a Carbon Nanotube Additive on the Corrosion-Resistance and Heat-Dissipation Properties of Plasma Electrolytic Oxidation on AZ31 Magnesium Alloy. Materials 2018, 11, 2438.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop