Effect of Oxidation Voltage on Micro-Arc Oxide Film of CNT/2024 Aluminum Matrix Composites

Lei Zhou

doi:10.6919/ICJE.202504_11(4).0024

Authors

Lei Zhou

DOI:

https://doi.org/10.6919/ICJE.202504_11(4).0024

Keywords:

CNT/2024 AMCs; Microarc Oxidation; Oxidation Voltage; Hardness; Corrosion.

Abstract

CNT/2024 AMCs (aluminum matrix composites) have great application prospects in the aerospace field due to their excellent mechanical properties. In order to enhance the corrosion resistance of the material, a micro-arc oxidation process was used to form an oxide ceramic layer on the surface of the material, and the effect of oxidation voltage on the morphology and properties of the film was investigated. With the increase of voltage, the number of micropores on the surface of the oxide layer decreased, the pore size increased, and the thickness gradually increased. When the voltage reached 430 V, cracks appeared on the surface of the oxide layer. When the voltage was 470 V, a new α-Al2O3 diffraction peak was generated at about 63.5° due to the excessive energy density on the surface of the sample. In the voltage range of 350 V to 430 V, the hardness and corrosion resistance of the oxide layer are positively correlated with the voltage, but when the voltage reaches 470 V, the hardness and corrosion resistance decrease due to the large pore size.

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