Preparation of Microarc Oxidation/Ultraviolet‐Cured Composite Coatings and Their Effect on TC4 Titanium Alloy Properties

To address the insufficient surface performance of TC4 titanium alloy under extreme operating conditions, such as those encountered in aerospace applications, a composite coating with excellent wear resistance, self‐cleaning properties, and corrosion resistance has been developed. First, a ceramic coating was grown in situ on the TC4 surface using microarc oxidation (MAO) technology. Subsequently, a light‐curable organic–inorganic composite coating was constructed on the MAO layer using ultraviolet light‐curing technology. This coating features acryloyldimorpholine (ACMO) and polyethylene glycol diacrylate (PEGDA‐200) as the polymer matrix and nano‐SiO ₂ as the reinforcing phase. The surface of this composite coating features micro‐ and nanoscale protrusions, exhibiting significant hydrophobicity and self‐cleaning capabilities. The corrosion potential of the composite coating was elevated to 0.0147 V, and the corrosion current density was reduced to 2.41 × 10 ⁻⁷ A/cm ² , demonstrating significantly superior corrosion resistance compared to a single MAO layer. After 100 cycles of abrasion, the composite coating containing 10 wt.% photoinitiator (TPO) retained its surface integrity, with no detachment of the SiO ₂ reinforcing particles. This composite coating achieves the multifunctional integration of enhanced wear resistance, self‐cleaning, and corrosion protection, providing an eco‐friendly and highly efficient innovative solution for the surface protection of titanium alloys in extreme environments.