CeCin additions on the structure and properties of micro‐arc oxidation coatings of 7050 aluminum alloy

Abstract Aluminum alloys are widely used in industrial manufacturing due to their excellent mechanical and processing properties. However, in harsh environments like high salinity and humidity, they are prone to corrosion, which can lead to performance degradation or failure. This study focuses on improving the surface properties of 7050 aluminum alloy through micro‐arc oxidation (MAO), with the addition of cerium cinnamate (CeCin) as a modifying agent. The optimal MAO parameters were identified as 12 g/L Na₂SiO₃, 8 A/dm 2 current density, 10% duty cycle, and a 15‐min oxidation time. CeCin was added at concentrations of 0 to 2.0 g/L to assess its effects. The MAO process involved the use of a silicate‐based electrolyte, with a voltage increase to form a dense oxide layer, and CeCin as an additive to enhance coating properties. Results showed that CeCin improved the coating's morphology, thickness, density, and corrosion resistance. At 1.5 g/L CeCin, the coating reached maximum hardness and minimum porosity, with optimal corrosion resistance, reflected by the lowest self‐corrosion current density of 9.266 × 10⁻¹⁰ A·cm⁻ 2 .