Effect of Cl- Content, pH Value and CO2 on Electrochemical Corrosion Features of Cr15 Super Martensitic Stainless Steel

Jin Ming Long; Quan Bin Liu; Kun Yu Zhao; Qi Long Yong; Jie Su

doi:10.4028/www.scientific.net/AMR.738.92

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 738Effect of Cl- Content, pH Value and CO2 on...

Effect of Cl^- Content, pH Value and CO₂ on Electrochemical Corrosion Features of Cr15 Super Martensitic Stainless Steel

Abstract:

The corrosion behavior of a Cr15 super martensitic stainless steel (Cr15 SMSS) was investigated in NaCl solutions by means of potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Effects of Cl^- content, pH value and saturated CO₂ on corrosion were sdudied. It was found that the parameters of maintaining passivity current density (i_p), the critical pitting potential (E_b) and charge transfer resistance (R_t) of Cr15 SMSS varied widely under different conditions. The corrosion resistance of Cr15 SMSS decrease with increasing Cl^- concentration and lowering pH value. Both i_p and E_b increase for Cr15 SMSS in CO₂-saturated NaCl solution, which verified that the CO₂ in NaCl solution can result in lower pitting sensitivity and higher uniform corrosion rate to Cr15 SMSS.

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Periodical:

Advanced Materials Research (Volume 738)

Pages:

92-96

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.738.92

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Online since:

August 2013

Authors:

Jin Ming Long, Quan Bin Liu, Kun Yu Zhao, Qi Long Yong, Jie Su

Keywords:

Corrosion, Electrochemical Impedance Spectroscopy (EIS), Pitting Corrosion, Polarization, Super Martensite Stainless Steel

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