<p>Issues such as Zn dendrites, hydrogen evolution reactions (HER), self-corrosion, and Zn anode passivation significantly hinder the development of Zn-ion batteries. In this study, Na₂SeO₃ was introduced into the ZnSO₄ electrolyte and NaCl solution to reduce the rate of hydrogen evolution reaction, thereby inhibiting both HER and self-corrosion in Zn. Experimental results indicate that after prolonged immersion, the surface of metallic Zn with the addition of Na₂SeO₃ remained smooth, whereas the surface without the corrosion inhibitor exhibited significant roughness and obvious signs of corrosion. According to the potentiodynamic polarization test results, Na₂SeO₃ can significantly reduce the overall current density in the cathodic region, indicating its notable inhibition effect on the hydrogen evolution reaction. On the other hand, long-term EIS test results demonstrate that Na₂SeO₃ can increase the low-frequency impedance value of the material, suggesting a substantial reduction in the self-corrosion rate of Zn. The protection mechanism of Na₂SeO₃ operates via two main pathways: (i) competition for electrons between SeO₃²⁻ reduction and hydrogen evolution, and (ii) the formation of a protective selenium-containing film that shields the zinc substrate. The research conducted in this project can provide valuable insights for the electrode protection of metallic Zn in the field of batteries.</p>