Facile fabrication of slippery liquid infused porous surface with self-repairing mesoporous structure and slippery attributes for magnesium alloy corrosion protection

The slippery liquid infused porous surface (SLIPS) with excellent anti-corrosion properties have been widely reported in recent years. Unfortunately, most of the previously reported SLIPS struggles to provide long-term effective corrosion protection for magnesium (Mg) alloys owing to the lack of effective mesoporous structure self-repairing capability. Herein, a SLIPS with a self-repair microstructure and slippery attributes was fabricated, which consisted of a MnOOH layer and a superhydrophobic active carbon/hydroxyl-modified hexagonal boron nitride (AC/BNO) coating. The abundant mesoporous structure of the AC favors the formation of a dense lubricant layer on the SLIPS. The addition of BNO as a two-dimensional filler creates a "labyrinth effect" within SLIPS, which enhances its overall corrosion resistance. In addition, MnOOH offers a self-repair microstructure and slippery attribute ability for SLIPS. Once the SLIPS is damaged, the damaged area undergoes structural and slippery attributes repair through the spontaneous reaction of MnOOH with Mg2+ and OH- to form Mn-Mg layered double hydroxides (LDH) with mesoporous structure for restoration. Moreover, the SLIPS not only exhibited excellent mechanical stability and anti-contamination performance, but electrochemical experiments also indicated that the corrosion protection efficiency of both the original and self-repaired SLIPS was greater than 99 %, demonstrating excellent corrosion resistance. Therefore, compared with traditional SLIPS, this study not only utilizes AC as storage container to avoid the complex mesoporous structure preparation process but also provides new insights for the sustainable development of SLIPS by regenerating new mesoporous structures and restoring the slippery attributes.