Nanostructured Coating for Aluminum Alloys Used in Aerospace Applications

A thin industrial corrosion-protection nanostructured coating for the Al alloy AA2024-T3 is demonstrated. The prepared in a two-step process utilizing hard anodizing as pre-treatment, followed by sealing and atomic layer deposition (ALD). In first step, sulfuric acid at low temperature converts surface into low-porosity anodic oxide. second pores are sealed coated low-temperature ALD using different metal oxides. resulting ceramic coatings thoroughly characterized cross-sectioning focused ion beam, scanning electron microscopy, transmission X-ray microanalysis, nanoindentation tested via linear sweep voltammetry, electrochemical impedance spectroscopy, salt spray, energetic oxygen flow. best corrosion protection coating, made 20 V, 1 °C with amorphous 2 O 3 /TiO nanolaminate, exhibits no signs of after 1000 h ISO 9227 spray test demonstrates maximum hardness 5.5 GPa. same also suffers negligible damage an test, which comparable to year exposure space Earth orbit.