Enhanced corrosion resistance of slippery liquid infused porous aluminum surfaces prepared by anodizing in simulated marine atmosphere

Transmission aluminum conductors in coastal areas are highly susceptible to corrosion by salt and acidic solutions, which leads to a decrease in the mechanical strength of the transmission conductors and even causes serious accidents of fracture. Traditional anti-corrosion methods have problems such as huge costs and low efficiency, and superhydrophobic coatings based on the lotus effect show poor durability. Herein, slippery liquid infused porous surface (SLIPS) for enhanced corrosion resistance was successfully prepared on 1060 pure aluminum (Bare) using anodizing combined with dimethyl silicone oil impregnation. The corrosion tendency and long-term corrosion resistance of SLIPS in simulated marine atmosphere were investigated. SLIPS exhibited the lowest corrosion tendency than Bare and anodic aluminum oxide (AAO). The corrosion current of Bare (7.85 x 10- 7 A/cm2) was remarkably decreased by SLIPS to only 1.85 x 10-10 A/cm2. SLIPS showed excellent corrosion resistance in 14-day salt spray corrosion and 30-day simulated seawater immersion. After prolonged corrosion, SLIPS still displayed very low corrosion current and extremely high lubricant layer resistance. The corrosion weight gain of SLIPS was reduced by one order of magnitude than Bare. Under the synergistic effect of the aluminum oxide layer and lubricant, SLIPS presented certain self-healing performance and could maintain good anti-corrosion performance for a long time.

Automated summary

Transmission aluminum conductors in coastal areas are vulnerable to corrosion by salt and acidic solutions, leading to decreased mechanical strength and potential fractures. Traditional anti-corrosion methods are costly and inefficient, while superhydrophobic coatings based on the lotus effect lack durability. A novel approach of slippery liquid infused porous surface (SLIPS) was successfully applied to enhance corrosion resistance on 1060 pure aluminum, showing superior performance in simulated marine atmosphere. SLIPS exhibited minimal corrosion tendency, significantly reducing corrosion current and weight gain, and maintaining excellent corrosion resistance even after prolonged exposure to salt spray and simulated seawater immersion.