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Determination of the relationship between beta-tricalcium phosphate/hydroxyapatite multilayers and their deterioration in a simulated body fluid

Abstract:

Considering that the 316LVM regarded as a medical-grade, is one of the most used biomaterials in the manufacturing of joint prosthesis, due to its low cost, and also its mechanical properties and resistance to corrosion, however, in the presence of body fluids, it degrades, liberating ions to the medium and causing rejection of the implant. An alternative to this phenomenon is to employ coatings of one or more materials that isolate the steel from environmental degradation. In this paper, multilayer coatings of hydroxyapatite/beta-tricalcium phosphate were deposited, with a variation in the number of layers (n=1, 10, 30 and 50 layers) at the constant thickness, to analyze the electrochemical behaviour as the number of layers increases. The scanning electron microscopy technique was used to determine the elemental composition of the multilayers and the Ca/P ratio. Atomic force microscopy analyses were also performed to determine the topography. It is obtained that the corrosion current density, decreases to a greater number of multilayers, offering an improved behaviour in the corrosion processes.