적층가공된 티타늄 합금의 전기화학적 특성에 미치는 불산의 영향
Effect of Hydrofluoric Acid on the Electrochemical Properties of Additive Manufactured Ti and Its Alloy
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In this study, the electrochemical properties of CP-Ti (commercially pure titanium) and Ti-64 (Ti-6Al-4V)were evaluated and the effect of hydrofluoric acid on corrosion resistance and electrochemical propertieswas elucidated. Additive manufactured materials were made by DMT (Directed Metal Tooling) method. Samples were heat-treated for 1 hour at 760 oC and then air cooled. Surface morphologies were studiedby optical microscope and SEM. Electrochemical properties were evaluated by anodic polarizationmethod and AC-impedance measurement. The oxide film formed on the surface was analyzed usingan XPS. The addition of HF led to an increase in the passive current density and critical currentdensity and decreased the polarization resistance regardless of the alloys employed. Based on thecomposition of the oxide film, the compositional difference observed by the addition of HF was little,regardless of the nature of alloys. The Warburg impedance obtained by AC-impedance measurementindicates the dissolution of the constituents of CP-Ti and Ti-64 through a porous oxide film.
Abstract
In this study, the electrochemical properties of CP-Ti (commercially pure titanium) and Ti-64 (Ti-6Al-4V)were evaluated and the effect of hydrofluoric acid on corrosion resistance and electrochemical propertieswas elucidated. Additive manufactured materials were made by DMT (Directed Metal Tooling) method. Samples were heat-treated for 1 hour at 760 oC and then air cooled. Surface morphologies were studiedby optical microscope and SEM. Electrochemical properties were evaluated by anodic polarizationmethod and AC-impedance measurement. The oxide film formed on the surface was analyzed usingan XPS. The addition of HF led to an increase in the passive current density and critical currentdensity and decreased the polarization resistance regardless of the alloys employed. Based on thecomposition of the oxide film, the compositional difference observed by the addition of HF was little,regardless of the nature of alloys. The Warburg impedance obtained by AC-impedance measurementindicates the dissolution of the constituents of CP-Ti and Ti-64 through a porous oxide film.
참고문헌 (17)
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