The Investigation of Sensitization Effect on the Corrosion Behavior of SAF 2205 Duplex SS at Transpassive Region

Subject Areas :

خشایار مرشدبهبهانی ¹ , پوریا نجفی سیار ² , محمود پاکشیر ³

1 - دانشگاه شیراز
2 - دانشگاه شیراز
3 - دانشگاه شیراز

Received: 2015-08-20 Accepted : 2017-03-11 Published : 2017-02-19

Keywords: SAF 2205 duplex stainless steel, Intergranular Corrosion, Electrochemical Impedance Technique,

Abstract :

In this study, intergranular corrosion (IGC) behaviour of SAF 2205 duplex stainless steels (DSS) was investigated in the "2M H2SO4 + 1M HCl" solution at 30 ◦C using potentiodynamic polarization, DLEPR, X-ray diffraction, electrochemical impedance spectroscopy (EIS) and cyclic polarization tests. The EIS test results of the specimens, with various degrees of sensitization for 1 h and 5 h at 725 oC, shows three different responses in the trans passive region depending on the applied DC bias. Moreover, the results indicate that the charge transfer and polarization resistance (Rct and RP) of the sensitized DSS specimens decrease as a result of increasing the sensitization time which is in accordance with the optical and SEM micrographs from the corroded samples surfaces.

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