Microscopic corrosion electric field analysis with damaged passive film of stainless steel

Abstract eng:
The electrochemical property of stainless steel subjected to a stress in a corrosive environment is addressed through the experimental and numerical investigations. The polarization curves of stainless steel under some constant tensile stresses were measured by the potentio-galvanostat. To clarify the effect of stress on the polarization curve, the electric field around the damaged passive film was simulated by the boundary element method. The passive film is broken by the plastic strain and defect surface appears. However its electrochemical property was unknown in general, so approximately replaced by the property of carbon steel. The defect area fraction can be associated with the plastic strain. From such viewpoint, the defect area fraction was fixed at some levels, and the macroscopic polarization curve was estimated by the microscopic electrostatic analysis. The numerical results were compared with the experimental results, and the effect of plastic strain was examined.

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