Preparation and Properties of CNTs/2024 Aluminum Matrix Composite Micro-Arc Oxidation Film

Aluminum alloys are prone to pitting and intergranular corrosion during use, which greatly limits their large-scale application. This study explores micro-arc oxidation (MAO) coatings on 1.5[Formula: see text]wt.% CNTs/2024Al composites to improve corrosion resistance. Using a Na 2 SiO 3 –NaOH electrolyte at 430[Formula: see text]V for 12[Formula: see text]min, MAO coatings were prepared. SEM shows denser surfaces with smaller pores in CNTs-reinforced coatings due to CNTs optimizing discharge channels. XRD confirms [Formula: see text]-Al 2 O 3 and [Formula: see text]-Al 2 O 3 phases, with higher crystallinity in CNTs/2024Al coatings. EDS detects C elements, indicating CNTs participation in film formation. Electrochemical tests in 0.5[Formula: see text]wt.% NaCl show CNTs/2024Al-MAO has a lower corrosion current density ([Formula: see text][Formula: see text]A/cm 2 ) and higher charge transfer resistance, demonstrating superior corrosion resistance. MAO with CNTs offers a viable strategy for enhancing Aluminum Matrix Composites (AMCs) durability in harsh environments.