Arabian Journal for Science and Engineering

, Volume 40, Issue 1, pp 63–67 | Cite as

Modified Point Defect Model for the Electrochemical Behavior of the Passive Films Formed on Alloy C (UNS N10002) in Borax Solutions

Research Article - Chemistry
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Abstract

Utilizing potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS), the passive films properties of alloy C in borax solutions under open circuit potential condition were evaluated. The potentiodynamic polarization curves suggested that alloy C showed excellent passive behavior in borax solutions. The capacitance versus potential curves revealed that the passive films displayed p-type semiconductive characteristics, where the Ni(II) vacancies preponderated over the oxygen vacancies and interstitials. The EIS data showed that the equivalent circuit \({{R}_{{\rm s}}[({R}_{{\rm fs}}{Q}_{{\rm fs}})({R}_{{\rm f}}{Q}_{{\rm f}}) ({R}_{{\rm mf}}{Q}_{{\rm mf}})]}\) by three time constants is applicable. These results also revealed that the measured value of polarization resistance increases with decreasing concentration of borax solutions.

Keywords

Alloy C Borax solution Polarization: EIS Passive films 
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References

  1. 1.
    Gray J.J., Orme C.A.: Electrochemical impedance spectroscopy study of the passive films of alloy 22 in low pH nitrate and chloride environments. Electrochim. Acta 52, 2370–2375 (2007)CrossRefGoogle Scholar
  2. 2.
    Raja K.S., Namjoshi S.A., Misra M.: Improved corrosion resistance of Ni–22Cr–13Mo–4W alloy by surface nanocrystallization. Mater. Lett. 59, 570–574 (2005)CrossRefGoogle Scholar
  3. 3.
    Gray J.J., El Dasher B.S., Orme C.A.: Competitive effects of metal dissolution and passivation modulated by surface structure: an AFM and EBSD study of the corrosion of alloy 22. Surf. Sci. 600, 2488–2494 (2006)CrossRefGoogle Scholar
  4. 4.
    Macdonald D.D.: Theoretical investigation of the evolution of the passive state on Alloy 22 in acidified, saturated brine under open circuit conditions. Electrochim. Acta 56, 7411–7420 (2011)CrossRefGoogle Scholar
  5. 5.
    Rodríguez M.A., Carranza R.M., Rebak R.B.: Influence of halide ions and alloy microstructure on the passive and localized corrosion behavior of alloy 22. Metall. Mater. Trans. A 36(5), 1179–1185 (2005)CrossRefGoogle Scholar
  6. 6.
    Lloyd A.C., Shoesmith D.W., McIntyre N.S., Noel J.J.: Effects of temperature and potential on the passive corrosion properties of alloys C22 and C276. J. Electrochem. Soc. 150, B120–B130 (2003)CrossRefGoogle Scholar
  7. 7.
    Rybalka K.V., Beketaeva L.A., Davydov A.D.: Effect of self-passivation on the electrochemical and corrosion behaviour of alloy C-22 in NaCl solutions. Corros. Sci. 54, 161–166 (2012)CrossRefGoogle Scholar
  8. 8.
    Gray J.J., Hayes J.R., Gdowski G.E., Viani B.E., Orme C.A.: Influence of solution pH, anion concentration, and temperature on the corrosion properties of alloy 22. J. Electrochem. Soc. 153(3), B61–B67 (2006)CrossRefGoogle Scholar
  9. 9.
    Gray J.J., Hayes J.R., Gdowski G.E., Orme C.A.: Inhibiting effects of nitrates on the passive film breakdown of alloy 22 in chloride environments. J. Electrochem. Soc. 153(5), B156–B161 (2006)CrossRefGoogle Scholar
  10. 10.
    Rodríguez M.A., Carranza R.M., Rebak R.B.: Passivation and depassivation of alloy 22 in acidic chloride solutions corrosion. J. Electrochem. Soc. 157(1), C1–C8 (2010)CrossRefGoogle Scholar
  11. 11.
    Zhang X., Shoesmith D.W.: Influence of temperature on passive film properties on Ni–Cr–Mo alloy C-2000. Corros. Sci. 76, 424–431 (2013)CrossRefGoogle Scholar
  12. 12.
    Zhang X., Zagidulin D., Shoesmith D.W.: Characterization of film properties on the Ni–Cr–Mo alloy C-2000. Electrochim. Acta 89, 814–822 (2013)CrossRefGoogle Scholar
  13. 13.
    Zagidulin D., Zhang X., Zhou J., Noël J.J., Shoesmith D.W.: Characterization of surface composition on alloy-22 in neutral chloride solutions. Surf. Interface Anal. 45, 1014–1019 (2013)CrossRefGoogle Scholar
  14. 14.
    Burstein G.T.: A hundred years of Tafel’s equation: 1905–2005. Corros. Sci. 47, 2858–2870 (2005)CrossRefGoogle Scholar
  15. 15.
    Zhang L., Macdonald D.D.: Segregation of alloying elements in passive systems—I. XPS studies on the Ni–W system. Electrochim. Acta 43, 2661–2671 (1998)CrossRefGoogle Scholar
  16. 16.
    Zhang L., Macdonald D.D.: Segregation of alloying elements in passive systems—II. Numerical simulation. Electrochim. Acta 43, 2673–2685 (1998)CrossRefGoogle Scholar
  17. 17.
    Nishimura R.: Pitting corrosion of nickel in borate and phosphate solutions. Corrosion 43, 486–492 (1987)CrossRefGoogle Scholar
  18. 18.
    Macdonald D.D.: The passive state in our reactive metals-based civilization. Arab. J. Sci. Eng. 37, 1143–1185 (2012)CrossRefGoogle Scholar
  19. 19.
    Macdonald D.D.: On the existence of our metals-based civilization I. Phase-space analysis. J. Electrochem. Soc. 153, B213–B224 (2006)CrossRefGoogle Scholar
  20. 20.
    Macdonald D.D.: On the tenuous nature of passivity and its role in the isolation of HLNW. J. Nucl. Mater. 379, 24–32 (2008)CrossRefGoogle Scholar
  21. 21.
    Priyantha N., Jayaweera P., Macdonald D.D., Sun A.: An electrochemical impedance study of alloy 22 in NaCl brine at elevated temperature. I. Corrosion behavior. J. Electroanal. Chem. 572, 409–419 (2004)CrossRefGoogle Scholar

Copyright information

© King Fahd University of Petroleum and Minerals 2014

Authors and Affiliations

  1. 1.Faculty of EngineeringBu-Ali Sina UniversityHamedanIran

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