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Abstract
Durable superhydrophobic surface on metal substrates was fabricated using very applicable method. The fabrication method aimed to decrease surface free energy and increase surface roughness at same time the process have been accomplished via the addition of silica nano particles with Dodecyltrimethoxysilane (DCTES) bonded to the surface of the silica particles. Adhesive polystyrene was added to improve bond between substrate and functionalized silica. The method is cheap, promising to be applied in factories heat exchangers to reduce fouling and corrosion on the large industrial scale. Scanning electron microscopy (SEM) was used for surface morphology analysis, showing the roughness produced by surface treatment. The wettability of the micro-nano silica film varied from hydrophilicity (water contact angle 88°) to superhydrophobicity (water contact angle 165.2°), while sliding contact angles dramatically decreased (<4°) by adding Functionalized silica and/or adhesive polymer. Roughness increased with silica increment which improves the wettability. The coatings were electrochemically characterized by electrochemical impedance spectroscopy (EIS) and Tafel polarization curves; it was found that both systems had good performance against corrosion in 3.5% sodium chloride solution.
Highlights
The solid surface with unusual wettability possessing both superhydrophobic and superoleophilic property has attracted great interest of research because of its enriched practical applications, including as a self-cleaning surface [1], as marine coatings [2-5], and as separation films for water and oil [6-8]
By comparing the two spectra it was found that the strong peak which appeared at about 3389 cm-1 is due to the presence of large amount of silanol OH group, Figure 1 shows FTIR spectrum of the hydrolyzed DCTES with SNP to form Functionalized silica nanoparticles (FS) the strong and broad peak which appeared at 3362 cm-1 was attributed to the presence of large number of OH groups on the surface of the silica nanoparticles (SNP)
The results show quite different capacitive loops that can be attributed to the charge transfer resistance of the corrosion process (Rct)
Summary
The solid surface with unusual wettability possessing both superhydrophobic and superoleophilic property has attracted great interest of research because of its enriched practical applications, including as a self-cleaning surface [1], as marine coatings [2-5], and as separation films for water and oil [6-8]. The corrosion behavior of the blank steel alloy with different superhydrophobic surfaces were investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization in NaCl solution (3.5 wt.%) using electrochemical system (GAMRY PCI4G750 instruments) at room temperature a typical-three electrode was used in electrochemical testing with reference electrode (saturated calomel electrode), a platinum wire as the counter electrode (auxiliary electrode) and the sample with an exposed area of 1.0 cm2 as the working electrode as demonstrated.
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