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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Plots of the current density vs the MAO time for the deposition of the coatings under different applied voltages: (a) CaP coating on Ti; (b) Zn-CaP coatings on Ti-40Nb; (c) Zn-CaP coating on Ti; (d) Zn-CaP coating on Ti-40Nb.