Corrosion performance of a steel surface modified by a robust graphene-based superhydrophobic film with hierarchical roughness

Abstract

Potentiostatic deposition of cobalt film and cobalt-graphene, Co-G, composite, followed by modification with low surface energy stearic acid (SA), was used to fabricate superhydrophobic films on a steel substrate successfully. A scanning electron microscope was used to analyze the surface morphology of the prepared superhydrophobic cobalt film modified by stearic acid, Co-SA, and the cobalt-graphene film modified by stearic acid, Co-G-SA. The findings show that both the fabricated films have micro-nanostructures. The Co-G-SA film shows a higher roughness due to the network structures of graphene and so exhibits higher superhydrophobicity. The Fourier transform infrared spectrophotometer, FTIR, results confirm the formation of Co-SA and Co-G-SA films on the steel surface. The wettability of the prepared films shows that they exhibit superhydrophobicity, where the Co-SA and Co-G-SA films have contact angles of 155° and 158°, respectively. The Potentiodynamic polarization results show that the value of the corrosion current density for steel coated with Co-SA (0.7094 µA) is lower than that of bare steel (0.1457 mA), while the coated steel with Co-G-SA film has the lowest value (0.1732 µA). The electrochemical impedance spectroscopy, EIS, results show that the charge transfer resistance for steel coated with Co-SA is 38 times that of bare steel, while steel coated with Co-SA is 57 times that of bare steel. Potentiodynamic polarization and EIS results show that the prepared Co-G-SA film superhydrophobic films exhibit higher corrosion resistance. Co-G-SA film has higher mechanical stability (maintains superhydrophobicity until 900 abrasion cycles), chemical stability (has superhydrophobicity in the pH range 1–13), and long-term stability (retains superhydrophobicity after 30 days in a 0.5 M NaCl solution) in 0.5 M NaCl solution.

Eco-friendly method for construction of superhydrophobic graphene-based coating on copper substrate and its corrosion resistance performance

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Fenugreek seed and cape gooseberry leaf extracts as green corrosion inhibitors for steel in the phosphoric acid industry

“…The inhibition efficiency, η, is calculated from the charge transfer resistance, R ct , using Eq. ( 8 ) 37 . where, R cto and R cti are the charge transfer resistances in the absence and presence of the extract, respectively.…”

“…The inhibition efficiency, η, is calculated from the charge transfer resistance, R ct , using Eq. ( 8) 37 .…”

Construction of superhydrophobic graphene-based coating on steel substrate and its ultraviolet durability and corrosion resistance properties

“…SHP surfaces with water contact angles more than 150° and water slide angles less than 10° have acquired extensive attention due to their vast array of potential uses, such as anticorrosion 3 , oil–water separation 4 , self-cleaning 5 , anti-icing 6 , antifouling 7 , biomedicine 8 , and drag reduction 9 . Various methods were utilized to manufacture bio-inspired SHP surfaces, including chemical vapor deposition 10 , chemical etching 11 , 3D printing 12 , sol-gel 13 , electrospinning 14 , anodization 15 , spraying 16 , and electrodeposition 17 . Most of these procedures are intricate and time-consuming, restricting their industrial applications on a large scale.…”