Influence of static load on corrosion rate of 30CrMnSiA steel in neutral and acidic solutions

The influence of static load on corrosion rate of 30CrMnSiA steel was investigated through variations of free corrosion potential, anodic polarization curve and electrochemical impedance spectroscopy as the static load increased. The experimental results indicated that the influence of the static load on corrosion rate depended on the control steps of corrosion process. When both of the cathodic and anodic processes are activation control, the corrosion rate increased with the applied stress. When the control step of system is diffusion, its corrosion rate could not be affected by the applied stress. When the tensile stress is big enough,it might cause a transition from cathodic control into oxygen-consumption control.