Anodic Polarization Behavior of Cold Worked Austenitic Stainless Steel

Abstract:

The anodic polarization behavior of Sanicro 28 austenitic stainless steels has been established in the cold worked (10 to 80% reduction in thickness) samples in 1N HCl, 1M H₂SO₄+ 1.5N HCl and 3N HCl solutions at room temperature. The current oscillations during the potentiodynamic scans appeared in 3N HCl implying formation of meta stable pits and this solution more severe than 1N HCl and 1M H₂SO₄+ 1.5N HCl. Two anodic peaks were observed in as-received and the cold worked samples in 3N HCl. In as-received state, the first anodic peak appeared at-3.95 mV_SCE and the second anodic peak appeared at 116 mV_SCE. It was established that selective dissolution started from 18mV_SCE. The grains and grain boundaries were not attacked at the beginning of the first peak-168 mV_SCE and started revealing at 18 and 216 mV_SCE in the potentiodynamic polarization test. The fore-scatter detector (FSD) attached to FEI Quanta EBSD revealed the pitting morphology of the specimens. It is shown that pit dimensions, types, distribution, the shape of pits in all deformation conditions is hemispherical and number of pits did not depend on the microstructural features, irrespective of the plastic deformation and it may not be related to severity of plastic deformation.

• Periodical: Advanced Materials Research (Volume 794)
• Pages: 632-642
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.794.632
• Online since: September 2013
• Authors: Narayanan Srinivasan, Ajay Kumar Revelly, Vivekanand Kain, Indradev Samajdar, Christopher R. Hutchinson, Palla Sivaprasad
• Keywords: Anodic Polarization, Electron Backscattered Diffraction (EBSD), Fore-Scatter Detector (FSD), Pitting Corrosion, Sanicro28

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