| METALS AND METAL MATRIX COMPOSITES |
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| Corrosion Resistance and Wear Resistance of Aluminum Alloy MAO Coating Enhanced by Co-doping of Carbon Nanotubes and Nano-aluminum |
| GUO Shuang, BAI Yu, GAO Yuanming, MA Wen*
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| Inner Mongolia Key Laboratory of New Materials and Surface Engineering, School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China |
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Abstract To investigate the modification effect of carbon nanotubes and nano alumina co-doping on the corrosion and wear resistance of aluminum alloy micro-arc oxidation coatings, multi-walled carbon nanotubes(MWCNTs) and nano alumina(α-Al2O3) particles were added as electrolyte additives into the silicate electrolyte system. The micro-arc oxidation technology was employed to fabricate the film layer on the surface of 6061T6 aluminum alloy. The micro-morphology, physical phase composition, and wear morphology of the ceramic layer were analyzed using scanning electron microscopy, X-ray diffractometer, and laser confocal microscopy. Additionally, the hardness, roughness, frictional wear, and electrochemical properties of the coatings were evaluated. The results indicated that the addition of MWCNTs and nano alumina particles primarily enhance the coating properties by modifying the micro-arc oxidation micropores and discharge channels. The hardness of the micro-arc oxidized coatings reached 1 289.8HV after the addition of MWCNTs and nano alumina. Moreover, the self-corrosion current density is reduced to 3.220×10-6 A·cm-2, which is one times higher than that of the unmodified micro-arc oxidized coatings. The friction coefficient of the micro-arc oxidized coa-ting is reduced to 0.294 after the addition of MWCNTs and nano-Al2O3. Furthermore, the volumetric wear rate is reduced to 0.23×10-4 mm3·N-1·m-1, which is only 1/5 of that of the unmodified coating.
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Published: 25 March 2026
Online: 2026-04-03
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2026, Vol. 40 
