<p>AZ31B magnesium alloys are widely used in the automotive, aerospace, and electronics industries due to its low density, high specific strength and stiffness, excellent casting performance, and outstanding shock absorption. However, in practical applications, external loads can lead to wear and corrosion, significantly affecting its service life. A fretting tribo-corrosion test rig is utilized to investigate the effect of different normal loads on the surface damage mechanisms and the electrochemical dynamic response of the test samples. Results showed that the surface contact stress and deformation increased with increasing load, resulting in enhanced wear and reduced corrosion resistance. The primary damage mechanisms of AZ31B magnesium alloy include abrasive wear, oxidative wear, delamination, and fatigue spalling.</p>