Fabrication of a leaf-like superhydrophobic CuO coating on 6061Al with good self-cleaning, mechanical and chemical stability
| Autor: | Kaixing Song, Xue Zhou, Xiaoli Yin, Zhexin Lv, Sirong Yu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Thermal oxidation Copper oxide Aqueous solution Materials science Process Chemistry and Technology Substrate (chemistry) 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Superhydrophobic coating Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Chemical engineering Coating chemistry 0103 physical sciences Nano Materials Chemistry Ceramics and Composites engineering Chemical stability 0210 nano-technology |
| Zdroj: | Ceramics International. 46:14872-14883 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2020.03.013 |
| Popis: | Copper oxide is widely used to obtain superhydrophobic surfaces due to its special micro/nano-structures and properties. However, there are few studies on a leaf-like CuO superhydrophobic coating by direct thermal oxidation of Cu on 6061Al substrate. In this work, there is a simple and low-cost method including chemical replacement, thermal oxidation and low-energy-modification with stearic acid. The resultant coating is superhydrophobic and oleophilic with water contact and sliding angles of 157 . 3 ∘ ± 0 . 5 ∘ and 3 . 6 ∘ ± 1 ∘ , respectively. Additionally, it has low adhesion and excellent self-cleaning performances, whose corresponding mechanical analyses are conducted to theoretically discuss that stable micro/nano-structures and trapped air pockets could effectively influence the interfacial adhesion. Importantly, after tape-peeling, sandpaper-abrasion, and chemical stability tests, the coating still keeps superhydrophobic. Especially, in 3.5 wt% NaCl aqueous solution, compared with the corrosion current density of bare 6061Al substrate ( 7.18 × 10 − 7 A / cm 2 ), that of the SHP CuO coating ( 0.77 × 10 − 7 A / cm 2 ) decreases obviously. In sum, the method is especially suitable for large-scale industrial production of a stable superhydrophobic coating on Al alloys. |
| Databáze: | OpenAIRE |
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