Photothermal self-healing coating

Considering the balance between mechanical properties and self-healing efficiency, a superhydrophobic coating with non-covalent bond gradient distribution was successfully prepared by hydrothermal reaction and spraying method.

Self-healing superhydrophobic coating opens a new door for the durability and stability of aluminum alloys. Image source: analogicus - Pixabay (symbol image).

The surface frosting and corrosion of Al alloy limit its diversified application. The self-healing superhydrophobic coating opens a new door for the durability and stability of aluminum alloys. However, it remains challenges to simultaneously achieve efficient self-healing efficiency and strong coating adhesion. Here, a coating with great wear resistance and fast self-healing was constructed by introducing thermodynamically stable coordination bonds and highly mobile hydrogen bonds. The prepared coatings exhibited excellent wear resistance, the super-hydrophobicity (water contact angle >150°) remained after 200 wear cycles. The coating could repair scratches for only 5 min at 80°C. And chemical damage repair could be achieved with the coating at room temperature for 40 min.

Superior performance

Based on the super-hydrophobicity of the coating and the dual repair of physical-chemical damage, the coating exhibits excellent self-cleaning, abrasion resistance, frost and corrosion resistance. In particular, thanks to the photothermal effect of Polydopamin, the self-healing performance of as-prepared coating could come true under sunlight.

The study has been published in Progress in Organic Coatings, Volume 180, July 2023.

Event tip

Protective coatings are also in the focus of the EC Conference Protective & Fire-retardant Coatings on October 18 -19 in Berlin, Germany. The latest developments in protective and fire-retardant coatings will be presented to you in one conference.

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