Magnesium (Mg) alloys exhibit tremendous potential as biomaterials due to their outstanding biodegradability, biocompatibility, and biomechanical properties. Despite these advantages, the primary challenge impeding their clinical application is their susceptibility to corrosion in physiological environments. Herein, we introduce two hydrophobic surfaces: "active" anti-corrosion superhydrophobic surfaces (SDSs) and slippery liquid-infused porous surfaces (SLIPSs). Our tribo-electrochemical tests confirm the exceptional anti-tribocorrosion and self-healing performance of both SDSs and SLIPSs. Detailed analyses, including immersion tests, scratch tests, and artificial scratch tests, reveal that when the laser-textured surface (LTS)/Mg-Mn surface is damaged, Mn²⁺ ions are released and migrate to the damaged site. This migration promotes the formation of intricate flower-like three-dimensional micro-nano structures of Mg-Mn layered double hydroxides, which effectively heal the defects. Additionally, this process aids in the removal of Cl⁻ ions from the protective coating. Remarkably, the LTS/Mg-Mn surface demonstrates an ability to repair defects even with scratch widths up to 380 μm. Furthermore, SDSs and LTS/Mg-Mn surfaces show remarkable self-healing robustness and chemical stability, effectively handling various types of scratches, including those approximately 10 mm in length. This study highlights a straightforward and efficient method for enhancing Mg alloys, paving the way for their use as viable bio-implant materials.
 

Magnesium alloy; superhydrophobic surface; slippery liquid-infused porous surface; anti-corrosion; anti-tribocorrosion; self-healing properties