Abstract
Recent worldwide demand has driven nickel and molybdenum prices to record high values. Alloys containing significant amounts of nickel and molybdenum, such as the austenitic and duplex grades, have experienced significant price increases and some spot shortages have resulted in some regions. With low or no nickel content and reasonable molybdenum content, super-ferritic stainless steels are now proving to be the most cost effective corrosion resistant materials. The electrochemical behavior APMT® (Fe–21Cr–5Al–3Mo–0.04C) and 4C54® (Fe–26.5Cr–0.8Mn–0.5Si) super-ferritic stainless steel in NaCl solutions has been studied using open circuit potential measurements, potentiodynamic polarization curves, and electrochemical impedance spectroscopy. The aim is to compare the behavior of these materials with austenitic stainless steel alloy 316 (Fe–18Cr–10Ni–2.5Mo). The results indicate that the APMT alloy presents a better performance than the AISI 316 stainless steel, while 4C54® does not, especially at anodic potentials. The good behavior of APMT ® may be attributed to Al and Mo content in its composition.
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Acknowledgements
This work was supported by PICT-2012-2952 of the National Agency for Promotion of Science and Technology. Thanks are due to the Argentinean Research Council (CONICET) for the financial support.
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© 2017 The Minerals, Metals & Materials Society
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Zadorozne, N.S., Vier, J.D., Rebak, R.B., Ares, A.E. (2017). Corrosion Behavior of Super-Ferritic Stainless Steels in NaCl Media. In: Ikhmayies, S., et al. Characterization of Minerals, Metals, and Materials 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51382-9_37
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