Construction and anti-corrosion behavior study of silanol-modified Ni-WS2 superhydrophobic composite coating

In this study, a novel superhydrophobic composite coating is prepared by a two-step method. Firstly, the Ni-based deposition coating is fabricated via composite electrodeposition with WS 2 granules worked as dispersed phase particles, and the roughness of deposit coating can be adjusted by changing the added amount of sulfide in the bath. The prepared Ni-WS 2 deposit exhibits sufficiently high roughness and suitable micro-nano morphology. Then, hexadecyltrimethoxysilane (HDTMS) is used to modify the deposition coating with low surface energy to obtain silanol-modified Ni-WS 2 coating with superhydrophobic properties. The superhydrophobic behavior of the composite coating conforms to the Cassie-Baxter model, with low adhesion to aqueous solutions. When the addition amount of WS 2 particles in the plating solution during the electrodeposition process is 5 g·L −1 , the prepared composite coating has the excellent superhydrophobic properties. The water contact angle of the composite coating is 154.7° ± 2 and the sliding angle can reach 6°. And the superhydrophobic composite coating exhibits excellent corrosion resistance .