Slippery Liquid-infused Porous Surface Fabricated on Aluminum Maintains Stable Corrosion Resistance at Elevated Temperatures
Abstract
Material corrosion induced by temperature variations is one of the main threats to materials immersed in complex and changeable marine environments. Superhydrophobic surfaces (SHS) are promising for protecting the underlying metal from corrosion. However, temperature variations in underwater environments have hindered the practical application of SHS, thus, their corrosion protection ability is limited. However, slippery liquid infused porous surfaces (SLIPS) can compensate for the aforementioned defects of SHS. In this research, a kind of SLIPS was designed over aluminum for marine corrosion applications using a three-step procedure, consisting of anodization, fluorination and solvent exchange method. The as-prepared SHS and SLIPS were characterized with scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and wettability measurement, and their corrosion properties were investigated by electrochemical impedance spectroscopy (EIS). With the perfluorinated lubricant and aluminium oxide coating, the SLIPS presented high corrosion resistance (2.06 × 109 Ω cm2) in a broad temperature range.
