Influence of deformation on electrochemical properties of Q235 steel

The influence of deformation on electrochemical properties of Q235 steel is studied. The uni-axial tension of the steel is conducted on universal testing machine to get a series of strain, 0.07%, 6%, 11% and 24%, respectively. The deformation process for strain of 0.07% is controlled by load, and the others are controlled by displacement correspondingly. Afterward, the tests of potentiodynamic polarization and electrochemical impedance spectroscopy are conducted for the deformed steel in 0.01 mol.dm⁻³ NaCl solution. The results showed that plastic deformation leads to crystalline grains refine and elongate, and crystalline boundary increases, it induces more corrosive possibility and lower corrosive resistance; the corrosion potential of Q235 steel becomes more negative with the increase of deformation amount, and the corrosion current density increases with the amount of deformation; the corrosion resistance decrease with the increase of deformation seriously.