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The Electrolytic Ionic Strength Effect on Corrosion Resistance and Crystallinity of Plasma Electrolytic Oxidation (PEO) Coating Developed on Ti6Al4V

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Abstract

The aim of this paper was to investigate the formation of an amorphous phase in the coating structure due to reduction in porosity and improvement in corrosion resistance of Ti6Al4V alloy during PEO process. The effect of crystallization on the electrochemical corrosion behavior and surface property of Ti6Al4V coating fabricated by plasma electrolytic oxidation (PEO) technique, was investigated in 5 wt %HCl solution. The coating compositions and electrochemical behaviors were examined by X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and electrochemical impedance spectroscopy (EIS) and polarization tests. The results showed that an increase in the ionic strength of electrolyte had a direct effect on the crystal size, the lattice strain and corrosion resistance. An increase in lattice strain due to Ti–O–Si led to a reduction in coating adhesion and corrosion resistance. A significant effect in phase transformation for Titania in the PEO process was not only led to an increase in polarization resistance but also reduced the number and size of porosity.

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Authors and Affiliations

  1. Imam Khomeini International University, Qazvin, Iran

    F. Malekmohammadi & A. Razaghian

  2. School of Metallurgy and Materials, College of Engineering, University of Tehran, Tehran, Iran

    C. Dehghanian

Authors
  1. F. Malekmohammadi
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  2. A. Razaghian
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  3. C. Dehghanian
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Correspondence to A. Razaghian.

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Malekmohammadi, F., Razaghian, A. & Dehghanian, C. The Electrolytic Ionic Strength Effect on Corrosion Resistance and Crystallinity of Plasma Electrolytic Oxidation (PEO) Coating Developed on Ti6Al4V. Prot Met Phys Chem Surf 55, 115–126 (2019). https://doi.org/10.1134/S2070205119010143

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  • DOI: https://doi.org/10.1134/S2070205119010143

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