Stress Corrosion Behavior of 20CrMnTi Gear Steel

Stress corrosion behavior of 20CrMnTi steel in a boronic acid buffer solution containing 0.3 mol/L Cl^- was studied by electrochemical noise method. Combined with ANSYS finite element simulation and in-situ tensile test of precast pitting samples, the stress distribution around the corrosion pit was analyzed. The results show that stress promoted the corrosion of 20CrMnTi steel, and the amplitude and life of the current noise peak of 20CrMnTi steel under constant stress were greatly improved compared with those without stress. At low stress levels, the rise in current noise peak had a long accumulation period. Due to the existence of pitting, significant stress concentration occurred perpendicular to the tensile direction, and the stress concentration was rapidly attenuated in the region far from the corrosion pit.