The time series of current density during electrochemical corrosion of Ti-48Al-2Cr-2Nb alloy was recorded by chronoamperometry, and the denoising effects of wavelet threshold and variational mode were compared. Kolmogorov (K) entropy was calculated to analyze the stability characteristics and influencing factors of the electrochemical corrosion system by combining the electrochemical impedance spectroscopy and corrosion surface morphology. The results prove that the electrochemical system shows strong chaotic characteristics, increasing firstly and then decreasing with the increase of applied potential. The coarsening degree of the electrode interface and the response rate of adsorption reaction have no obvious effects on the stability of the electrochemical system when the applied potential is 7~13 V, but have significant influence at 16 V. The smooth interface decreases the stability of the system, which is mainly attributed to the intensity and complexity of the electrochemical reaction at the high potential.