Session: Advanced Protective Coating Technology Symposium & Forum (Part I of III)
Effect of TiO₂ Pretreatment on the Corrosion Properties of Inconel 625 Overlay-Welded Low-Alloy Steel. (C2026-00294)
Monday, March 16, 2026
11:30 AM - 12:00 PM Central
Location: 350 DEF
Earn .5 PDH
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Overlay welding with corrosion-resistant alloys is widely used to enhance the durability of components operating in corrosive environments such as offshore, petrochemical, and power industries. This study investigates the influence of oxide-based surface pretreatments—titanium dioxide (TiO₂) on the corrosion performance of Inconel 625 overlays applied to low-alloy carbon steel using the Gas Tungsten Arc Welding (GTAW) process. Two sets of samples were prepared: one with TiO₂ surface activation and a control without any flux. Corrosion resistance was evaluated through potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a 3.5% NaCl solution. Salt spray testing (ASTM B117) was also conducted to assess atmospheric corrosion resistance. Microstructural examination using scanning electron microscopy (SEM) was performed to analyze passive film characteristics and weld interface morphology. TiO₂ demonstrated superior corrosion resistance compared to without flux sample, likely due to the formation of a more stable and adherent passive oxide film on the weld surface. The findings this study that oxide-based surface activation using TiO₂ can significantly enhance both electrochemical and atmospheric corrosion resistance, making it a viable pretreatment strategy for extending the service life of Inconel 625 overlayed components in aggressive environments.
