Journal
CORROSION SCIENCE
Volume 120, Issue -, Pages 90-98Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2017.02.027
Keywords
Stainless steels; EIS; Polarization; Passive films; Pitting corrosion
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Influence of nitrogen alloying on corrosion resistance of martensitic stainless steels (MSSs) with different nitrogen contents was investigated by immersion corrosion measurement and electrochemical measurement in chloride medium. It was observed that the nitrogen bearing MSSs exhibit more superior corrosion resistance, and an optimum range of nitrogen content between 0.04-0.05 wt% was found. The degradation of corrosion properties happened in higher nitrogen bearing samples is attributed to the occurrence of more concentrated Cr-depleted zones resulted from massive Cr-rich M23C6 carbides precipitation, although nitrogen addition is believed to be able to improve the corrosion resistance of MSSs effectively. (C) 2017 Elsevier Ltd. All rights reserved.
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