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

Abstract

Slippery liquid-infused porous surfaces (SLIPSs) can be formed by impregnating lubricants in porous surfaces with low surface energy. In this study, SLIPSs have been obtained on practically important aluminum with a porous anodic alumina layer by impregnating lubricants containing organic additives. The additive-containing lubricants change the surface slippery even without prior organic coating of the porous alumina surface. The additive-containing SLIPSs reveal a low water sliding angle of <5° and markedly improved corrosion resistance in an acetic acid solution containing chloride. The SLIPSs are formed by the in situ adsorption of the organic additives on the porous alumina surface. The scratched defects induce corrosion of the organic coating-type SLIPSs, whereas the additive-containing SLIPSs sustain high corrosion resistance even after introducing scratch defects. The adsorption of the organic additive in lubricants and refilling of the lubricant are responsible for the self-healing of the corrosion resistance. Thus, the additive-containing SLIPSs are promising self-healing corrosion-resistant surfaces.

Nontoxic Liquid-Infused Slippery Coating Prepared on Steel Substrates Inhibits Corrosion and Biofouling Adhesion

“…As observed in Figure b and f–h, the scratches were mainly corrosion-free, except for the upper half of the left scratch (as indicated by a red arrow) and a localized region on the right side of the sample (as indicated by a blue arrow), possibly due to a defect in the coating, while both corroded pits represent ∼ 3% of the overall area. The latter demonstrates again the importance of the self-healing characteristics of the LISS to improve corrosion resistance, while the defect sites, such as scratches of tens of micrometers, were resealed with the liquid lubricant, contributing to the enhanced corrosion protection, similarly to the SLIPS …”

“…The latter demonstrates again the importance of the selfhealing characteristics of the LISS to improve corrosion resistance, while the defect sites, such as scratches of tens of micrometers, were resealed with the liquid lubricant, contributing to the enhanced corrosion protection, similarly to the SLIPS. 64 Another phenomenon associated with the wetting of solid surfaces in marine environments is the formation of biofilms, commonly called "biofouling". Biofilms contain a diverse variety of micro-organisms.…”

Recent advances of slippery liquid-infused porous surfaces with anti-corrosion

“…Most current reports impregnate micro/nanoporous structures with lubricating oil, which uses the capillary forces of the substrate porous structure and the surface tension of the lubricant as the driving force to inject the lubricant into the porous structure. [115][116][117][118] However, the fact that the lower driving force of the immersion method may not enable the complete escape of the air that previously filled the porous structure is regularly ignored. As a result, the air is trapped in the porous structure and lubricant does not completely fill the pores, resulting in insufficient thickness of the lubrication layer.…”

Superior Corrosion and UV-Resistant Highly Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/alumina Superhydrophobic Coating

“…The proper combination of microscale and nanoscale topographical features complements surface chemical properties. It leads to the formation of superfunctionalities such as superhydrophobicity, − reducing the capability of water droplets to stick , and consequently improving the anticorrosion properties of this kind of coatings. Based on the WCA and the sliding angle (SA) of water, Carre et al described the necessity for a water droplet to slide on an inclined surface.…”