The effect of superhydrophobic wetting state on corrosion protection – The AKD example

Nanosecond laser micro- and nanotexturing for the design of a superhydrophobic coating robust against long-term contact with water, cavitation, and abrasion

“…Superhydrophobic coatings are designed for use as a passive method of protecting materials and are expected to become a significant alternative to more complex and energy consuming techniques. As shown by experimental, numerical and analytical studies, superhydrophobic surfaces typically have reduced drag in both laminar and turbulent flows [6,7], high corrosion resistance [8][9][10] and stability against certain kinds of mechanical loads [11][12][13][14]. This reinforces the optimistic view that these surfaces could be used in a hazardous medium or conditions of underwater operation, especially in marine environments.…”

Long-term corrosion protection by a thin nano-composite coating

“…4a. For all three samples the OCP initially increases slightly, and then remains well above that for corroding carbon steel (−0.64 V vs. Ag/AgCl) [37] for the 100 days of exposure. The transient drop in OCP value seen for cell 1 and cell 3 suggests the presence of defects in the coating that first are penetrated by electrolyte and corrosive ions and then blocked by the corrosion products formed inside the defects.…”

Superhydrophobic surfaces for corrosion protection: a review of recent progresses and future directions

“…13a). 106,108,109 In EIS measurements, this is often seen as a dominant capacitive behavior, and occasionally unmeasurably high impedance moduli in the lowfrequency range (Figs. 13b and 13c).…”

“…Ejenstam et al prepared alkyl ketene dimer (AKD) wax coatings with a lotus-like surface (high contact angle, low CAH) and a rose-like surface (high contact angle, high CAH) and tracked the variations of their EIS spectra for up to 17 days. 108 Compared to a lotuslike surface, water can easily penetrate into the microscaled structures on the rose-like surface. Therefore, despite a similarly high contact angle, the absence of air pockets resulted in a rapid decay of impedance modulus for the rose-like surface when immersed during the EIS studies.…”