Abstract
In the current study, inclusions and the pitting corrosion resistance of 304 stainless steels with and without lanthanum addition were analyzed using a scanning electron microscope attached with an energy dispersive spectrum and an anodic potentiodynamic polarization test in 3.5 wt% NaCl solution. Inclusions of (Mn, Cr, Si, Al, Ca)-oxides were modified to (La, Al, Si)-oxides in the stainless steel by the addition of lanthanum. The number density and area fraction of oxide inclusions increased from 8.6 mm−2 and 165 ppm to 29.9 mm−2 and 153.5 ppm, respectively, while those of pure MnS decreased from 36.9 mm−2 and 162.9 ppm to 22.6 mm−2 and 101.7 ppm, respectively. Due to the variation in the chemical composition of oxide inclusions and the decrease in the amount of MnS, the potential of pitting corrosion was increased from 0.167 VSCE to 0.303 VSCE.
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Acknowledgements
The authors are grateful for the support from the National Natural Science Foundation of China (Grant No. 52104342), the Natural Science Foundation of Heibei Province (Grant No. E2021203062), and the High Steel Center (HSC) at North China University of Technology, Yanshan University and University of Science and Technology Beijing.
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© 2023 The Minerals, Metals & Materials Society
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Ren, Q., Zhang, L. (2023). Improvement of Pitting Corrosion Resistance of 304 Stainless Steel with Lanthanum Addition. In: TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22524-6_88
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DOI: https://doi.org/10.1007/978-3-031-22524-6_88
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