Article overview
This study reports two novel phosphate conversion coatings deposited on Ti6Al4V by chemical conversion, based on Mg-Zn and Zr-Zn systems. The results show that zirconium promotes a denser and more compact coating morphology, while magnesium favors acicular crystals and visible intercrystalline areas. XRD analysis confirmed the presence of hopeite and phosphophyllite, together with phases specific to Mg- and Zr-containing systems. The Zr-Zn coating exhibited markedly improved corrosion resistance, reaching up to nine times higher values in Ringer and Dulbecco solutions, while wettability and in vitro cytotoxicity tests indicated favorable adhesion and improved viability of L929 fibroblast cells. Overall, the work highlights the role of Mg and Zr ions in tailoring the morphology, corrosion performance, and biological behavior of zinc-based phosphate coatings on titanium alloy substrates.
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