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中南大学学报(英文版)

Journal of Central South University

Vol. 22    No. 6    June 2015

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Microstructure characterization and electrochemical corrosion behavior of Zn and Zn/Mg alloys in H2SO4 solution
S. H. Ettefagh Far1, A. Rahimi2, M. Chaghazardi2, A. Davoodi3

1. Young Researchers and Elites Club, North Tehran Branch, Islamic Azad University, Tehran, Iran;
2. Electrochemistry and Inhibitors Group, Environmental Protection Department,
Research Institute of Petroleum Industry, Tehran, Iran;
3. Materials and Polymers Engineering Department, Faculty of Engineering, Hakim Sabzevari University,
Sabzevar 391, Iran

Abstract:The three systems of pure Zn, Zn-0.10% Mg (mass fraction), and Zn-0.15% Mg (mass fraction) were cast under controlled atmosphere and their microstructures were characterized by SEM/EDS analysis. The electrochemical corrosion behavior of these three samples was examined in the very aggressive solution of 50% H2SO4 (mass fraction) using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results show that magnesium improves in some extent the corrosion resistance of pure Zn in 50% H2SO4 (mass fraction) confirmed by EIS test. Results of polarization measurment also demonstrate that small amount of Mg significantly improves the passivation of Zn in the test solution. Results of surface morphology of the samples and EDS analysis reveal that Mg reduced the corrosion attacks to pure Zn.

 

Key words: composites; corrosion; zinc-magnesium alloys; potentiodynamic polarization; electrochemical impedance spectroscopy

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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