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Study of the Intergranular Corrosion of Sensitized UNS S31803 Stainless Steel in Transpassive Region

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Abstract

In this study, intergranular corrosion behavior of UNS S31803 duplex stainless steel was investigated using conventional potentiodynamic polarization, double loop electrochemical potentiokinetic reactivation (DLEPR), and electrochemical impedance spectroscopy (EIS) technique carried out at different potentials in the transpassive region. Different types of heat treatments were used to obtain samples with different degrees of sensitization. The results of the DLEPR tests showed that the solution-annealed sample and that was sensitized for half an hour would be considered as nonsensitized ones. Moreover, the sample that was sensitized for 24 h exhibits the highest value of the degree of sensitization. Polarization test results showed a typical active-passive behavior from which the transpassive potential range was determined and used as the range of the applied DC bias in the EIS experiments. Three different AC responses (including capacitive and inductive responses) were observed depending on the value of applied DC bias in the EIS experiments. In addition, it was observed that the presence of the second inductive loop at high applied DC bias is due to the adsorption of nonsoluble corrosion products on the surface of the samples. Moreover, the fitted values to the charge transfer and polarization resistances (R ct and R P) decreased as the sensitization time increased from 30 min to 24 h. Such observations were in good accordance with the metallographic examination of the corroded surfaces, carried out by optical and scanning electron microscopy techniques, revealing discontinuous grain boundary attack in nonsensitized samples and a continuous network of grain boundary attack in the case of sensitized ones. Moreover, as the applied DC bias increases the ferrite phase attack also occurs in the sensitized samples. In addition, approximately no pitting corrosion was observed on the surface of the corroded samples which is in accordance with their respective cyclic polarization responses.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Blvd., 7134851154, Shiraz, Iran

    Khashayar Morshed Behbahani, Pooria Najafisayar & Mahmoud Pakshir

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  1. Khashayar Morshed Behbahani
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  2. Pooria Najafisayar
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  3. Mahmoud Pakshir
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Correspondence to Pooria Najafisayar.

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Morshed Behbahani, K., Najafisayar, P. & Pakshir, M. Study of the Intergranular Corrosion of Sensitized UNS S31803 Stainless Steel in Transpassive Region. J. of Materi Eng and Perform 25, 3418–3429 (2016). https://doi.org/10.1007/s11665-016-2176-3

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  • DOI: https://doi.org/10.1007/s11665-016-2176-3

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