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Plasma Electrolytic Oxidation Coatings on Pure Ti Substrate: Effects of Na3PO4 Concentration on Morphology and Corrosion Behavior of Coatings in Ringer’s Physiological Solution

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Abstract

Plasma electrolytic oxidation has been used as a relatively new method for applying ceramic coatings having different features. In the present study, commercially pure titanium is used as substrate, and effects of trisodium phosphate electrolyte concentration on the microstructure, as well as corrosion behavior of the coating in Ringer’s physiological solution are investigated. The morphology and phase compositions of coatings were analyzed by using scanning electron microscopy (SEM) and x-ray diffraction patterns. The study on the corrosion behavior of samples in a Ringer’s physiological solution was carried out using open-circuit potential potentiodynamic polarization and electrochemical impedance spectroscopy. The results of electrochemical analysis proved that higher concentration of phosphate electrolyte leads to increase in the corrosion resistance of applied coatings. Accordingly, obtained results revealed that the optimum electrolyte concentration for the best corrosion behavior was 20 g L−1. Furthermore, SEM images and reduction in the dielectric breakdown potential indicated that increase in the electrolyte concentration leads to morphological improvement and smoothening of the surface.

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Authors and Affiliations

  1. Department of Materials Engineering, Bu-Ali Sina University, Hamedan, 65178-38695, Iran

    Masoud Roknian, Arash Fattah-alhosseini & Seyed Omid Gashti

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  1. Masoud Roknian
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  2. Arash Fattah-alhosseini
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  3. Seyed Omid Gashti
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Correspondence to Masoud Roknian.

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Roknian, M., Fattah-alhosseini, A. & Gashti, S.O. Plasma Electrolytic Oxidation Coatings on Pure Ti Substrate: Effects of Na3PO4 Concentration on Morphology and Corrosion Behavior of Coatings in Ringer’s Physiological Solution. J. of Materi Eng and Perform 27, 1343–1351 (2018). https://doi.org/10.1007/s11665-018-3236-7

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  • DOI: https://doi.org/10.1007/s11665-018-3236-7

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