The Effect of Cl⁻ on the Corrosion Resistance of CF/Ti/<i>β</i>-PbO₂ Anodes Used in Zinc Electrodeposition

Current research on Cl − corrosion behavior has primarily focused on traditional Pb-Ag anode systems and the analysis of the effects of single concentration variables. While the CF/Ti/ β -PbO 2 composite anode developed by our research team previously demonstrated significant performance advantages in zinc electroplating applications, the dynamic competition mechanism between passivation and corrosion in chloride-containing electrolytic environments remains unclear. Especially under the synergistic effects of multiple parameters such as Cl − concentration, current density, and acid-to-zinc ratio, the evolution of the microstructure at the electrode interface and its structure-property correlation mechanism with macroscopic performance have not been systematically elucidated. Therefore, this study systematically investigated the influence of Cl − concentration, current density, and acid-to-zinc ratio on the performance of the CF/Ti/ β -PbO 2 anode during zinc electroplating. As the Cl − concentration increases, the corrosion rate and cell voltage of the CF/Ti/ β -PbO 2 anode also increase, and the self-corrosion potential decreases. When the Cl − concentration is 250 mg l −1 and the current density is 500 A m −2 , with an acid-to-zinc ratio of 3:1, the minimum corrosion rate is 1.5496 g m −2 ·h −1 , the cell voltage is 2.96 V, the maximum Ecorr value is 1.0436 V, and the minimum Icorr value is 9.5080 × 10 –5 A cm −2 .