Abstract: Titanium alloys, with excellent corrosion resistance and mechanical strength, are widely used in marine engineering but remain vulnerable to biofouling. Although bioinspired slippery liquid-infused porous surfaces (SLIPS) offer promising antifouling potential, their practical application in harsh marine environments is severely limited by lubricant depletion. Herein, a silver-plated slippery antifouling surface (SSAS) is developed, which combines physical and chemical dual-function antifouling strategies. By exploiting the tip effect during electroplating, the SSAS forms a special oil-locking structure, achieving a 250.78 % increase in oil retention (4.49 mg cm^-2). Oil-locking tests further confirmed a stable lubricating layer with an oil loss rate below 30 %, nearly half that of conventional SLIPS under strong water and airflow impact. Meanwhile, the dense silver coating ensures sustained Ag⁺ release, which is approximately 175-fold higher than that of conventional silver-containing antifouling surfaces (Ag-NPs/SLIPS), significantly enhancing chemical antifouling performance. Benefiting from this dual mechanism, the SSAS exhibits broad-spectrum antifouling performance, effectively resisting protein adsorption, bacterial colonization, diatom adhesion, and macrofouling by mussels and barnacles. This study offers an effective strategy for developing high-performance antifouling materials in marine engineering applications.

Key words: Titanium alloy, Silver-plating, Liquid infusion, Dual-functional antifouling