Superhydrophobic, Active Anti-Corrosion, and Solar Anti-Icing Coating with Fast Self-Healing Properties
Corrosion and icing critically threaten the service safety of magnesium (Mg) alloys in aerospace and transportation industries. Although superhydrophobic coatings offer effective anti-corrosion and anti-icing functions, they are limited by susceptibility to failure due to physical damage or capillary condensation. Here, a multifunctional integrated coating (SAAS) is reported, which endows coated Mg alloys with excellent superhydrophobicity, active anti-corrosion performance, anti-icing properties, and fast self-healing capabilities. Layered double hydroxide (LDH) modified and intercalated with sodium laurate (La) acts as nanoreservoirs, releasing La corrosion inhibitors via an anion-exchange process to retard corrosion. Incorporation of MXene provides full-spectrum high absorption and efficient photothermal conversion, achieving a surface temperature of 61 °C under 1.0 sun illumination, which prevents adhesion and accumulation of supercooled droplets. Near-infrared (NIR) irradiation induces macromolecular chain migration and phase transition, enabling fast self-healing of coating damage. The SAAS coating exhibits a water contact angle of 153°, a corrosion current density of 1.294 × 10⁻⁹ A·cm⁻² (four orders of magnitude lower than bare Mg alloy), an icing delay time approximately 23 times longer than the substrate, and a healing rate of about 0.34 cm·s⁻¹ under NIR. This study provides a novel strategy for enhancing aircraft skin durability and offers insights into multifunctional coating design.