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Abstract
Medical implants manufactured using biomaterial Ti-6Al-4V exhibit some disadvantages. Its higher elastic modulus than that of natural bone can cause stress shielding problems. This can be avoided using Ti-6Al-4V with pores in the implant structure. However, poor corrosion and tribocorrosion behaviors are yielded because of the large area exposed to the medium. To mitigate both issues, coating technologies can be applied. The plasma electrolytic oxidation (PEO) process is a cost-effective process that has been used successfully in nonporous Ti alloys. In this study, two PEO coatings with different amounts of Ca/P are used. However, reports regarding their application in porous materials are scarce. The effects of PEO treatments on corrosion and tribocorrosion in Ti-6Al-4V powder metallurgy are analyzed herein. The porous materials provide an efficient surface for PEO coatings, as demonstrated via scanning electron microscopy (SEM) and atomic force microscopy (AFM), and the porosity of the substrates improved the adherence of the coatings. The corrosion resistance measured via electrochemical impedance spectroscopy confirmed the beneficial effect of the coatings, particularly for long exposure time. The lower roughness, small pore size, and more compact film observed in the PEO-Ca/P sample resulted in favorable tribological and corrosion properties.
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Details
1 Universidad de Valladolid, Materials Engineering, E.I.I., Valladolid, Spain (GRID:grid.5239.d) (ISNI:0000 0001 2286 5329); Universidad de Valladolid, BioecoUVA Research Institute, Valladolid, Spain (GRID:grid.5239.d) (ISNI:0000 0001 2286 5329)
2 Universidad de Valladolid, BioecoUVA Research Institute, Valladolid, Spain (GRID:grid.5239.d) (ISNI:0000 0001 2286 5329); Universidad de Valladolid, Group UVASENS, Escuela de Ingenierías Industriales, Valladolid, Spain (GRID:grid.5239.d) (ISNI:0000 0001 2286 5329)
3 Univesitat Politécnica de Valencia, Instituto de Tecnología de Materials, Valencia, Spain (GRID:grid.157927.f) (ISNI:0000 0004 1770 5832)
4 Fundación IK4-Tekniker, Tribology Unit, Eibar, Spain (GRID:grid.6496.d) (ISNI:0000 0004 1763 8481)
5 Universidad de Valladolid, Group UVASENS, Escuela de Ingenierías Industriales, Valladolid, Spain (GRID:grid.5239.d) (ISNI:0000 0001 2286 5329)