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Passivation Characterization of Nickel-Based Glassy Alloys in Artificial Sea Water

  • Hanaa AL-Refai
  • Khadijah Mohammed Emran AbdalsamadEmail author
Article
  • 37 Downloads

Abstract

The effect of different pH values of artificial sea water on the passivation behavior and the pitting corrosion resistance of Ni70Cr21Si0.5B0.5P8C≤0.1Co≤1Fe≤1 (VZ1) and Ni72.65Cr7.3Si6.7B2.15C≤0.06Fe8.2Mo3 (VZ2) glassy alloys were studied using impedance spectroscopy measurements (EIS), cyclic polarization, and electrochemical frequency modulation techniques. The results showed that the alloys undergo a general corrosion process and tend to form an oxide film on the alloy surface, developing a stable protective layer in the artificial seawater solution. In both alloys, the lower corrosion current density was observed at a pH of 8.5 but had less pitting corrosion resistance. The VZ1 alloy had a relatively lower passive current density value, having a smaller anodic hysteresis loop area compared to the VZ2 alloy. The effect of the medium’s pH on corrosion potential, corrosion current density, pitting potential, and repassivation potential was investigated and discussed, as was surface morphology.

Graphic abstract

Keywords

Ni-based glassy alloys Passivation Artificial seawater Cyclic polarization EIS EFM 

Notes

Acknowledgements

The authors would like to thank Dr. Hartmann Thomas from Vacuumschmelze company for providing the specimens. Also, the authors would like to thank Mr. Abdallah Jaber of physical department for conducting surface measurements of the study samples.

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Copyright information

© The Korean Institute of Metals and Materials 2019

Authors and Affiliations

  1. 1.Chemistry Department, College of ScienceTaibah UniversityYanbuSaudi Arabia
  2. 2.Chemistry Department, College of ScienceTaibah UniversityAl-Madinah Al-MonawarahSaudi Arabia

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