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Effects of Mo and Mn on Pitting Behavior of Duplex Stainless Steel

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Abstract

Effects of Mo and Mn elements on pitting corrosion resistance of lean duplex stainless steel in Cl− media solution have been studied. Gravimetric tests in 6 mass% FeCl3 at 35 °C and potentiodynamic analysis in 3.5 mass% NaCl were carried out. The corrosion potential (Ecoor) and the pitting potential (Epit) are shifted to a more noble potential because of the presence of Mo around the pits. While the presence of Mn could sharply reduce the value of pitting resistance equivalent number (PREn) and the pits can be formed more easily. The pits are found generating at the phase with a lower PREn. The identical tendencies between the Epit and PREn of weaker phase are the same. A corrosion mechanism has been proposed to determinate pitting corrosion behavior based on microstructural observations.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai University, 200072, Shanghai, China

    Li-cong An (Master), Jing Cao, Lin-cai Wu, Hong-huan Mao & Yi-tao Yang (Doctor, Professor)

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  1. Li-cong An
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  2. Jing Cao
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  3. Lin-cai Wu
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  4. Hong-huan Mao
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Correspondence to Li-cong An or Yi-tao Yang.

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An, Lc., Cao, J., Wu, Lc. et al. Effects of Mo and Mn on Pitting Behavior of Duplex Stainless Steel. J. Iron Steel Res. Int. 23, 1333–1341 (2016). https://doi.org/10.1016/S1006-706X(16)30196-0

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