Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Corrosion properties of Mg-Ca-Gd alloy applied to biodegradable implants
Submission Author:
Ana Caroline Crema de Almeida , RJ , Brazil
Co-Authors:
Carlos Elias, Daniel Fernandes, Emília Monteiro, Paula Gomes, Ana Caroline Crema de Almeida
Presenter: Ana Caroline Crema de Almeida
doi://10.26678/ABCM.COBEM2017.COB17-1009
Abstract
Magnesium (Mg) alloys have the characteristic of bioabsorption, non-toxicity, physical and mechanical properties similar to bone. The purpose of this work is to investigate the corrosion properties of magnesium-calcium-gadolinium (Mg-Ca-Gd) alloy with a new composition. Samples from the Mg-Ca-Gd and Mg-Ca alloys were underwent potentiodynamic polarization tests and were analyzed by optical microscopy and surface roughness measurements. The results of the both alloys were compared in order to evaluate the effect of addition of Gadolinium. Comparing the results of both alloys, at all rates the Mg-Ca-Gd alloy had a more positive corrosion potential and a drop in the corrosion rate. The magnesium-calcium-gadolinium alloy presented best corrosion resistance with corrosion rate until 1/10 smaller than magnesium-calcium alloy, depending on the tests conditions.
Keywords
Biocorrosion, Magnesium-rare earth alloys, Biodegradable Implants, Tafel extrapolation
