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A study on pitting initiation mechanism of super-austenitic stainless steel weld in chloride environment

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Abstract

There has been controversy over the localized corrosion mechanism of super-austenitic stainless steel weld due mainly to the lack of effective evaluation technique for identification of corrosion nucleation site in weld. For this reason, an electrochemical polarization method followed by an observation of microstructure using the back-scattered electron mode in field emission-scanning electron microscopy is used. To clarify the localized corrosion mechanism, energy dispersive spectroscopy line profile analyzed by transmission electron microscopy is additionally utilized. It clearly reveals that the selective corrosion is preferentially initiated around the σ-phase precipitated in the interdendritic region in weld. The local depletion of Cr and Mo around the σ-phase can be partly replenished by the diffusion of the elements into the depleted area during the subsequent heat treatment at 1180 °C.

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ACKNOWLEDGMENTS

This work was supported by Sunchon National University and Pohang Iron and Steel Co. Ltd (POSCO) in Korea.

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Authors and Affiliations

  1. Department of Advanced Materials Engineering, Sunchon National University, Suncheon, 540-742, Republic of Korea

    Sung Jin Kim

  2. POSCO Steel Solution Marketing Division, Pohang, 790-704, Korea

    Seung Gab Hong

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  1. Sung Jin Kim
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  2. Seung Gab Hong
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Correspondence to Sung Jin Kim.

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Kim, S.J., Hong, S.G. A study on pitting initiation mechanism of super-austenitic stainless steel weld in chloride environment. Journal of Materials Research 31, 3345–3351 (2016). https://doi.org/10.1557/jmr.2016.347

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  • DOI: https://doi.org/10.1557/jmr.2016.347

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