Long‐Term Stability of a Liquid‐Infused Coating with Anti‐Corrosion and Anti‐Icing Potentials on Al Alloy

Abstract

Corrosion and surface icing severely shorten the service life of aluminum and its alloys. Herein, we synthesized wrinkled and porous, hollow, tubular SiO2 on an Al alloy, followed by fluorination with (Heptadecafluoro‐1,1,2,2‐tetradecyl) trimethoxysilane (FAS) and then infusing Krytox 100 for obtaining novel slippery liquid‐infused porous surfaces (SLIPSs). The unique structure greatly reduced the loss of lubricant due to the volatilization or subcooled condensation and thus effectively extended the life of the SLIPS. The corrosion resistance of as‐prepared SLIPS was five orders of magnitude higher than that of the bare Al alloy and did not change significantly after immersion in an NaCl solution for 93 days. The ice‐adhesion strength remained at approximately 18 kPa for the whole duration of the icing/deicing cycles. The samples exhibited a low contact angle hysteresis and superior self‐cleaning properties. In addition, we also revealed the differences in self‐cleaning and anti‐icing macroscopic phenomena of superhydrophobic surfaces (SHS) and SLIPS.

Facile One-Step Method to Fabricate a Slippery Lubricant-Infused Surface (LIS) with Self-Replenishment Properties for Anti-Icing Applications

“…Carmalt et al prepared a slippery LIS by infusing Krytox lubricating oil into a titanium dioxide (TiO 2 )/tin dioxide (SnO 2 ) composite thin film [35]. This surface effectively slowed ice formation for >30 min at −10 • C. Zhang et al used fluorinated tubular SiO 2 as the porous structure and constructed a slippery LIS on aluminum alloy after modification by Krytox 100 lubricating oil [36]. The surface exhibited a low ice adhesion strength in the icing/deicing cycle tests.…”

Brushable Lubricant-Infused Porous Coating with Enhanced Stability by One-Step Phase Separation

“…SLIPS can serve as an anti-corrosion coating as reported in previous literature because the non-polar lubricant layer protects the substrate from the corrosive medium such as water, ions, and oxygen. − In Figure a, it can be seen that droplets of 0.1 M HCl solution were dropped on the bare tinplate and SLIPS for 24 h. A corroded region appeared on the bare tinplate surface while no changes could be observed on the SLIPS. To obtain a quantitative result, we conducted the electrochemical impedance spectroscopy (EIS) test on the bare and SLIPS-coated Cu substrates.…”

Slippery Liquid-Infused Porous Surfaces on Aluminum for Corrosion Protection with Improved Self-Healing Ability

“…The corrosion-resistant SLIPSs have been reported in the past decade. ,− ,− These SLIPSs used an organic coating before impregnating lubricants. It is likely that the mechanical damage of the coated solid surface reduces the stability of SLIPSs and causes degradation of corrosion resistance.…”