Fabrication of self-cleaning super-hydrophobic nickel/graphene hybrid film with improved corrosion resistance on mild steel
Abstract A self-cleaning super-hydrophobic nickel/graphene hybrid film with hierarchical structure was successfully fabricated on mild steel (MS) by electro-deposition process followed by myristic acid modification. The surface morphology and composition were characterized by a field emission scanning electron microscope (FESEM) and attached energy dispersive X-ray spectrum (EDS). The results showed that the hierarchical nickel/graphene film was well formed with random pinecone-like nano-protrusions nickel array on every micro-graphene-protrusion. The super-hydrophobic surface exhibited excellent super-hydrophobicity with a static water contact angle (CA) as high as 160.4±1.5° and a sliding angle (SA) as low as 4.0±0.9°. The super-hydrophobic surface showed excellent anticorrosion performance, mechanical durability and long-term stability in 3.5wt.% NaCl solution, which were characterized by electrochemical impedance spectroscopy (EIS), sandpaper abrasion and immersion tests. In addition, the super-hydrophobic surface also exhibited good self-cleaning performance. Highlights The nickel/graphene hybrid super-hydrophobic film are successfully fabricated by electrochemical-deposition method. The addition of graphene sheets with nano-nickel-cones array on them are homogeneous distribution. The super-hydrophobic film exhibits excellent corrosion resistance, mechanical durability and self-cleaning performance. Relationship of process, microstructures and super-hydrophobic property is established. Graphical abstract The nickel/graphene hybrid super-hydrophobic surface was successfully fabricated on mild steel via electro-deposition method and afterward modified by myristic acid. The result showed that the hierarchical nickel/graphene film was well formed with random nano-nickel-cones array on every micro-graphene-protrusion. [DISPLAY OMISSION]
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