Low adhesive and superhydrophobic LDH coating for anti-corrosion and self-cleaning

Superhydrophobic coatings show wide applications. Here, a low adhesive superhydrophobic surface was prepared by an in-situ growth of layered double hydroxide (LDH) combined with a surface modification process by stearic acid (STA). The LDH sheets provide a rough structure and the STA molecule provides the low surface energy. As results, the STA-LDH coating shows a water contact angle of 151°. The siliding angle of the STA-LDH coating is less than 5°. Besides, the coating shows a low-adhesive surface with good self-cleaning property. Electrochemical tests confirms that the STA-LDH coating shows elevated coating resistance from 5.105 × 104 Ω·cm2 for bare sample to 8.46 × 106 Ω·cm2. Furthermore, the corrosion current density of the STA-LDH coating decreases by ~2 orders of magnitude compared to the bare Al alloy. This work provide a novel strategy for constructing low-adhesive, self-cleaning and anticorrosive coating.