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The electrochemical characteristics of pitting for two steels in phosphate buffer solution with chloride

Authors
Journal
Materials Chemistry and Physics
0254-0584
Publisher
Elsevier
Publication Date
Volume
116
Identifiers
DOI: 10.1016/j.matchemphys.2009.04.019
Keywords
  • Pitting Corrosion
  • Metastable Pitting
  • Steel
  • Impedance
  • Capacitance

Abstract

Abstract Metastable pitting and stable pitting behaviors of two carbon steels in 0.05 M Na 3PO 4 + 0.03 M Na 2B 4O 7 + 0.03 M Na 2SO 4 solution with 0.05 M NaCl or without NaCl (pH = 9.4) were studied by polarization measurements, current fluctuation measurements, EIS tests and analysis of Mott–Schottky plots. Compared with A3 steel, 16Mn steel shows higher passive film impedance and lower pitting susceptibility, which is characterized by higher pitting breakdown potential E b, metastable pitting potential E m and flat band potential U fb values, and lower electron concentration in the passive film. When the potential is above E m, diffusion tails occur on the resistance plots, indicating the beginning of local damage to the surface.

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