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Role of chloride in the electrochemical behaviour of AZ31B Mg alloy

  • Arash Fattah-alhosseini and Mahshid Sabaghi Joni
Published/Copyright: March 12, 2015
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 106 Issue 3

Abstract

The role of chloride in the electrochemical behaviour of AZ31B Mg alloy in 0.05 M NaOH was investigated by means of potentiodynamic polarization, Mott–Schottky analysis, electrochemical impedance spectroscopy and scanning electron microscopy. Potentiodynamic polarization curves indicated that chloride concentration increase leads to a narrower passivation region of AZ31B Mg alloy. Also, the polarization curves revealed that increasing chloride concentration leads to higher corrosion current density in AZ31B Mg alloy. The micrographs clearly showed that the number and depth of pits increased with increasing chloride concentration. The Mott–Schottky analysis showed that the passive films have n-type semiconductive characteristics, where the number of oxygen vacancies and interstitials predominate over the cation vacancies. Moreover, Mott–Schottky results showed that the donor densities are in the range of 1021 cm−3 and increase with increasing chloride concentration.

Keywords: Mg alloy; Chloride; Mott–Schottky analysis; SEM; EIS
* Correspondence address, Dr. Arash Fattah-alhosseini, Faculty of Engineering, Bu-Ali Sina University, Hamedan 65178-38695, Iran, Tel.: +988138257409, Fax: +988138257400, E-mail: ,

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Received: 2014-09-29
Accepted: 2014-11-21
Published Online: 2015-03-12
Published in Print: 2015-03-11

© 2015, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111183
Keywords for this article
Mg alloy; Chloride; Mott–Schottky analysis; SEM; EIS

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Phase equilibria studies of the “MnO”–Al2O3–SiO2 system in equilibrium with metallic alloy. Part 2: phase equilibria
  5. X-ray stress measurement from an imperfect Debye–Scherrer ring
  6. Effect of heat treatment on the microstructure and tensile properties of Ti-5Al-3Zr-4Mo-3V alloy
  7. Quantification of roping in aluminium sheet alloys for car body applications by combining 3D surface measurements with Fourier analysis
  8. Dissimilar friction stir welding between polycarbonate and AA 7075 aluminum alloy
  9. Evaluation of the corrosion resistance of plasma nitrided austenitic stainless steel
  10. Corrosion performance and microstructural response of A380 matrix alloy reinforced with sol–gel TiO2-coated SiC particles: a perspective on previous studies
  11. Role of chloride in the electrochemical behaviour of AZ31B Mg alloy
  12. Implications of solute super-saturation in growth of vaporisation-induced recrystallised grains during heat treatment in Ni-base superalloys
  13. Rapid synthesis of Mn3O4 powder from pyro-synthesis of ethylene glycol–metal nitrate precursor assisted by nitric acid
  14. Production of bioactive glass-derived scaffolds using citric acid porogen
  15. Short Communications
  16. Microstructure and mechanical properties of deformed Mg–Mn–Sn alloys
  17. Fast microwave synthesis and characterization of MgTi2O5
  18. Time dependent synthesis of crystalline Bi2S3 and its application as a sensitizer in SnO2 based solar cells
  19. Synthesis of cobalt-doped CdS (CdS:Co) by a simple and rapid microwave activated method and investigating optical properties
  20. People
  21. In Memoriam Volker Schumacher
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