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Self-Healable Anti-Corrosion Coating under High Impacting via Integrating Shear Thinning, Shear Thickening Effects,
Zihong Zhang1,2, Ying Liu1,2, Chengyao Hu2
1State Key Laboratory of Environmental-friendly Energy Materials, Southwest University of Science and Technology, Mianyang621010, China.
Abstract:
The preparation of anti-corrosive coatings with durability under impacting still remains a big challenge. In this work, polyureas (BPUB) with the shear hardening effect (SHE) were prepared by introducing B-O dynamic bonds. Besides, the transfer self-healing effect was realized by integrating a bottom fast self-healing coating. The two-layered polymer coating was found to combine fast self-healing toward large-size scratch (∼5 h) and high impact resistance (>20 J/mm). Multi-layered anti-corrosive coating can repair damage by impacting and preserve high impedance (1.32 × 1010 Ω·cm2) after 250 d. The prepared anti-corrosive coating system has high impact resistance, long-term durability, and room temperature autonomous fast self-healing ability, which provides a broad application prospect for impact-resistant anti-corrosive applications.
