Vinyltrimethoxysilane (VTMS)-based coatings are known for their potential in improving the corrosion resistance of metallic surfaces, particularly titanium alloys. While numerous studies have examined silane systems containing corrosion inhibitors or nanoparticles, the role of pure multilayer VTMS architectures remains poorly understood. This study investigates how the number of VTMS layers (ranging from 1 to 6), applied via the sol-gel dip-coating method, affects the electrochemical behavior and microstructural characteristics of coatings on titanium Grade 2 and Ti6Al4V alloy. All multilayer configurations were first tested in 0.5 mol L