Microstructure and pitting corrosion resistance of annealed duplex stainless steel |
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Authors: | Z Cvijovi G Radenkovi |
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Affiliation: | aFaculty of Technology and Metallurgy, University of Belgrade, 11120 Belgrade, Karnegijeva 4, Serbia and Montenegro;bFaculty of Mechanical Engineering, University of Niš, 18000 Niš, A. Medvedeva 14, Serbia and Montenegro |
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Abstract: | The transition from metastable to stable pitting was studied in 0.5 M NaCl water solution for two cast duplex stainless steels under different microstructural conditions achieved by annealing in the range from 900 °C to 1200 °C. The ensuing microstructural changes in heat treated steels were defined and correlated with established pitting potentials (Ep) and sites of corrosion damage initiation. The variations in Ep have been discussed in terms of secondary phases precipitation. The critical condition for pit stability was quantified and used to select an appropriate microstructural state, resulting in the higher potential at which stable pit growth is first observed. |
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Keywords: | A Stainless steel B Polarization B SEM C Passivity C Pitting corrosion |
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