Details

Autor(en) / Beteiligte

• Zhao, Yamei
• Zhang, Pengyuan
• Gu, Xiaoqi
• Zhang, Xinglong
• Huo, Mengdan

Titel

Preparation of PVDF-PDMS-SiO2 multi-stage rough superhydrophobic coating with excellent anti-corrosion and drag reduction performance via one-step cold spraying

Ist Teil von

• Surface & coatings technology, 2023-10, Vol.471, p.129882, Article 129882

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Suitable superhydrophobic surface micromorphology, which can capture air underwater to form an air film, was used to decrease the solid-liquid contact area between the substrate and water, and thus reduce the intrusion of corrosive media and the resistance of movement. In this research, PVDF-PDMS-PF@μ/nSiO2 (PPPSS) multi-stage rough superhydrophobic coating was prepared on aluminum alloy by one-step cold spraying. Perfluorodecyltrimethoxysilane (PFDT) modified dual-scale SiO2 microparticles were used to provide the desired roughness. Low surface energy polymers polyvinylidene fluoride (PVDF) and polydimethylsiloxane (PDMS) were introduced as the polymer skeleton. The water contact angle of the PPPSS coating was 162.6°, with good superhydrophobicity. The coating exhibited excellent anti-corrosion that |Z|0.01 Hz was still three orders of magnitude higher than the bare substrate after 10 days of immersion. The flow experiment results showed that a maximum of 35 % drag reduction was achieved in Reynolds from 6 × 103 to 4 × 104. The equivalent circuit and drag reduction mechanism of the coatings were further investigated by combining surface morphology and material composition. Besides, the PPPSS coating demonstrated good stability and self-cleaning performance. The large-area superhydrophobic surface made by simple and convenient one-step cold spraying, is expected to have practical applications in marine transportation, underwater mapping, and pipeline transportation. [Display omitted] •A superhydrophobic coating with multi-stage roughness is prepared on aluminum alloy by a one-step cold spraying method.•Dual-scale silica was used to construct higher surface roughness of the coating, and polymer skeleton combined with micro/nanoparticles can enhance gas-trapping underwater.•The superhydrophobic coating reduced the intrusion of corrosive media and the frictional resistance to movement, and also showed stability, weather resistance and self-cleaning properties.