<p>FeCo alloys play a crucial role in modern industry due to their excellent soft magnetic properties. However, their inherent poor corrosion resistance limits their application in harsh environments. This study, for the first time, explores the fabrication of phytic acid conversion coatings (PACC) containing various concentrations of Zn²⁺ on the surface of FeCo alloys, aiming to enhance their corrosion resistance. The structure and properties of the coating are systematically characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), along with electrochemical techniques including open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and potentiodynamic polarization (PDP). The wire beam electrode (WBE) technique is innovatively employed to evaluate the dynamic local corrosion protection behavior. The results demonstrate that the formation of PACC significantly improves the corrosion resistance of FeCo alloys. The concentration of Zn²⁺ plays a critical regulatory role in modulating the structural compactness and long-term protective durability of the coating. In particular, the PACC prepared with 3&#xa0;mM Zn²⁺ (3-PZ) exhibits the most outstanding long-term corrosion resistance and self-enhancing capability, maintaining a protection efficiency of up to 92.03% after 120&#xa0;h of immersion in 3.5 wt% NaCl solution. The self-enhancing behavior is closely related to the dissolution of metal-phytate complexes and the formation of more stable passivation components during secondary passivation. WBE test results reveal, at the microscale, the effective suppression of local corrosion by PACC on FeCo alloys, with the 3-PZ sample exhibiting no distinct local anodic peaks throughout the entire test period. This study provides new experimental evidence for the development of high-performance and environmentally friendly protective coatings for FeCo alloys.</p>