The Influence of TMPSi Post-treatment on the Corrosion Resistance Behavior of TMPSi Pre-treated Anodized Aluminum: Characterization and Mechanism

In the current study, the silane layers are fabricated, assisting Trimethoxy(propyl)silane (TMPSi) precursor. As the single TMPSi-treated anodized surface revealed promising quality but not an ideal one, TMPSi double treatment through the sol–gel route was considered to enhance the superficial, and electrochemical properties of the anodized substrate. The general characterizations of the synthesized double TMPSi layer were conducted by X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), and Scanning Electron Microscopy (SEM). Physical features including roughness and, wettability also were measured to highlight the effect of the double TMPSi layer on the topography of the surface. Moreover, the electrochemical performance of the double treated layer was evaluated by Open Circuit Potential (OCP) and Electrochemical Impedance Spectroscopy (EIS). Although the roughness and wettability were very similar to those of single TMPSi-treated anodized surface, the double TMPSi-treated layer showed dramatic improvement in corrosion resistance. Rt was increased up to 665.62 kΩ by creating a double TMPSi layer, which demonstrates excellent corrosion protection.