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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Intergranular Corrosion of UNS S31803 Heat Treated at 800 °C Varying Range Times
Najara Barros Dias, Bianca Barros dos Santos and Pedro Rupf Pereira Viana*
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DOI:10.17265/1934-7375/2015.08.004
The aim of this work is evaluate the intergranular corrosion on UNS S31803 steel, with heat treatments at 800 °C, varying treatment times of 30 mins, 360 mins and 1,440 mins. The results confirm the formation of σ phases and secondary austenite (γ2). For the analysis of the influence of σ and γ2 phases, metallographic analysis were conducted through optical microscopy, potentiokinetic reactivation electrochemical techniques and potentiodynamic polarization in NaCl 3.5% solution. Microstructural analysis has shown a formation of γ2 and σ phase in heat treatment, due to diffusion of chromium and molybdenum from δ phase to γ phase, precipitating on δ/γ and δ/δ interfaces. The DL-EPR (Double loop electrochemical potentiokinetic reactivation) results have shown an increase of the DOS (degree of sensitization) for long periods of time on heat treatment. The results of potentiodynamic polarization showed a reduction of the corrosion and pitting potentials, followed by an increase of the current density when the UNS S31830 steel is heat treated during long periods of time.
Intergranular corrosion, σ phase, DL-EPR, pitting corrosion.
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