Influence of Zn²⁺ on Corrosion Behavior of Ti in H₂SO₄ Solution with F⁻

抄録

The influence of Zn²⁺ on the corrosion behavior of Ti in 1.68 mol L⁻¹ H₂SO₄ with 0.058 mol L⁻¹ F⁻ solutions was investigated by mass loss measurements, electrochemical tests, and surface observation and analysis. Different concentrations of Zn²⁺ (0.0002 mol L⁻¹, 0.002 mol L⁻¹, 0.02 mol L⁻¹, 0.2 mol L⁻¹) were added to the solutions to investigate the effect of Zn²⁺ concentration. The mass loss results showed that the presence of Zn²⁺ in the corrosive solution could accelerate the corrosion of Ti. From the electrochemical tests results, the corrosion resistance is decreased while increasing the Zn²⁺ concentration. An adsorption-desorption model of TiF_x^3−x on Ti was proposed: Zn²⁺ could inhibit the adsorption process of TiF_x^3−x and reduce the surface coverage of TiF_x^3−x, which could provide more active site for Ti to dissolve, resulted in the severe corrosion of Ti.