<p>This study aimed to investigate the effects of Ti content on the microstructure and electrochemical corrosion properties of AlCrCuFeNi high-entropy alloy (HEA) sheets. HEA sheets with varying Ti contents were prepared using vacuum melting followed by rolling. The microstructure and phase composition of the alloys before and after corrosion were characterized via scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), x-ray diffraction (XRD), and x-ray photoelectron spectroscopy (XPS). Polarization curves and electrochemical impedance were measured using an electrochemical workstation to compare the corrosion behavior of AlCrCuFeNiTi_x HEAs. The results indicated that the HEA sheets exhibited a dual-phase structure of FCC (face-centered cubic) and BCC (body-centered cubic). When the Ti content reached 1.0, Laves phases emerged. The corrosion resistance analysis revealed that the alloy's corrosion resistance initially increased and then decreased with higher Ti content, reaching an optimal value at <i>x</i> = 0.5. These findings provide critical insights into the composition-property relationship of Ti-containing HEAs for corrosion-resistant applications.</p>