Slippery liquid infused porous surfaces with corrosion resistance potential on aluminum alloy

Abstract

The slippery liquid infused porous surface has developed into a potential technology to solve the problem of poor durability in corrosion resistance. Herein, a kind of slippery liquid infused porous surface is created on 7075 aluminum alloy by wire electrical discharge machining for corrosion resistant applications. The hardness of the constructed porous microstructure is similar to the aluminum alloy substrate material, which ensures the stability of the slippery liquid infused porous surface. The modification of low surface energy substance fluorosilane avoids the direct contact between corrosive liquid and porous surface, and improves the lyophobic performance of the porous microstructure surface. The corrosion resistance of the porous microstructure surface is enhanced by the injection of perfluorinated lubricating oil. The experimental results show that the created slippery liquid infused porous surface can display super-slippery properties and durable corrosion resistance. The average sliding velocity of a water droplet is 0.48 ± 0.05 mm s⁻¹ at a sliding angle of 5°. The corrosion current density of the surface is 3.116 × 10⁻⁶ A cm⁻², which is 2 orders of magnitude lower than that of the polished surface. And the impedance radius reaches 90 kΩ cm², which is about 20 times that of the polished surface.