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Metals 2017, 7(4), 127; doi:10.3390/met7040127

Preparation and Properties of Microarc Oxidation Self-Lubricating Composite Coatings on Aluminum Alloy

School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
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Academic Editor: Alexandru Mihai Grumezescu
Received: 22 January 2017 / Revised: 22 March 2017 / Accepted: 28 March 2017 / Published: 5 April 2017
(This article belongs to the Special Issue Metallic and Metal Oxide Nanoparticles: Novel Approaches)
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Abstract

Microarc oxidation (MAO) coatings were prepared on 2024-T4 aluminum alloy using pulsed bipolar power supply at different cathode current densities. The MAO ceramic coatings contained many crater-like micropores and a small number of microcracks. After the MAO coatings were formed, the coated samples were immersed into a water-based Polytetrafluoroethylene (PTFE) dispersion. The micropores and microcracks on the surface of the MAO coatings were filled with PTFE dispersion for preparing MAO self-lubricating composite coatings. The microstructure and properties of MAO coatings and the wear resistance of microarc oxidation self-lubricating composite coatings were analyzed by SEM, laser confocal microscope, X-ray diffractometry (XRD), Vickers hardness test, scratch test and ball-on-disc abrasive tests, respectively. The results revealed that the wear rates of the MAO coatings decreased significantly with an increase in cathode current density. Compared to the MAO coatings, the microarc oxidation self-lubricating composite coatings exhibited a lower friction coefficient and lower wear rates. View Full-Text
Keywords: 2024-T4 aluminum alloy; microarc oxidation; cathode current density; PTFE; adhesion strength; wear resistance 2024-T4 aluminum alloy; microarc oxidation; cathode current density; PTFE; adhesion strength; wear resistance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, Z.; Di, S. Preparation and Properties of Microarc Oxidation Self-Lubricating Composite Coatings on Aluminum Alloy. Metals 2017, 7, 127.

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