Effects of nitrogen on the passivation of nickel-free high nitrogen and manganese stainless steels in acidic chloride solutions |
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| Authors: | Yao Fu En-Hou Han Ke Yang |
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| Affiliation: | a State key Laboratory for Corrosion and Protection, Institute of Metal Research, South Campus, Chinese Academy of Sciences, Shenyang 110016, PR China
b School of Materials and Metallurgy, Northeastern University, Shenyang 110004, PR China |
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| Abstract: | The role of nitrogen on the passivation of nickel-free high nitrogen and manganese stainless steels was investigated in 0.5 M H2SO4, 3.5% NaCl and 0.5 M H2SO4 + 0.5 M NaCl solutions using potentiodynamic polarization, electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy techniques. The passive film stability was enhanced in 0.5 M H2SO4 and the pitting resistance was improved in 3.5% NaCl solution by more nitrogen addition. The influence of nitrogen extended the whole anodic polarization region in 0.5 M H2SO4 + 0.5 M NaCl solution, as demonstrated by the enhanced dissolution resistance, promoted adsorption and passivation process, improved film protection and pitting resistance with increasing nitrogen content. Possible mechanisms relating to the role of nitrogen in different potential regions were discussed. |
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| Keywords: | Nitrogen Stainless steel Electrochemical impedance spectroscopy Passivation X-ray photoelectron spectroscopy |
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