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Investigation of Mixed-Type Craters and the Role of Bifluoride Additives to Produce Zirconia-Toughened Alumina-Based PEO Coating

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Abstract

Al2O3-ZrO2 composite ceramic coatings were prepared on Al6061 aluminum alloy by plasma electrolytic oxidation in Na3PO4-K2ZrF6-Na2SiF6-based alkaline electrolyte. Optimum processing time for the coating formation was found to be ~ 50 min. Cross section and surface morphology of the coatings were analyzed using scanning electron microscope. From the phase and elemental composition analysis, the presence of m-ZrO2 and t-ZrO2 phases was confirmed. It was further observed that the peak intensities of t-ZrO2 and α-Al2O3 phases increased with processing time, which was attributed to the enhanced crystallinity caused by the efficient sintering conditions. Corrosion properties were investigated by potentiodynamic polarization test in 3.5 wt.% NaCl solution. The results showed high improvement in corrosion rate with minimum recorded value ~ 0.25 mmy (mm/year) and corrosion current ~ 0.15 × 10−6 A/cm2.

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Acknowledgments

This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2011-0030058).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Changwon National University, Changwon, 641-773, South Korea

    Zeeshan Ur Rehman, Seong Hun Shin & Bon Heun Koo

  2. Department of Physics, Abdul Wali Khan University, Garden Campus, Mardan, Pakistan

    Tanveer Ahmad

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  1. Zeeshan Ur Rehman
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  2. Seong Hun Shin
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  4. Bon Heun Koo
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Correspondence to Zeeshan Ur Rehman.

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Ur Rehman, Z., Shin, S.H., Ahmad, T. et al. Investigation of Mixed-Type Craters and the Role of Bifluoride Additives to Produce Zirconia-Toughened Alumina-Based PEO Coating. J. of Materi Eng and Perform 27, 2430–2437 (2018). https://doi.org/10.1007/s11665-018-3338-2

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  • DOI: https://doi.org/10.1007/s11665-018-3338-2

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