Ensaios eletroquímicos para aplicação de magnésio puro e liga de magnésio com terras raras como biomaterial para regeneração óssea.

Abstract

The present work investigated the electrochemical behavior of magnesium metal under two composition conditions, pure and alloyed with earth alloy. To simulate the working conditions of these materials a phosphate buffered saline (PBS) solution that simulates body fluid, was used. The samples were produced using the cold embedding process and the tests were carried out with samples immersed in the PBS solution. The electrochemical properties could be evaluated from the Electrochemical Impedance Spectroscopy (EIE) and Potentiodynamic Polarization electrochemical tests. After polarization and immersion analysis, a microstructural characterization was performed by optical microscopy. Electrochemical testing is of vital importance to analyze the potential application of a material as biomaterial, since it is from them that it is possible to indicate the behavior of the studied material simulating the real conditions without endangering human lives. One of the current aims in the magnesium study as a biomaterial, is to control degradation with bone replacement rate. That is, the intention is to indicate whether there is compatibility of magnesium degradation rate with the natural replacement rate. Briefly, you can indicate if it is possible to apply magnesium as a biometal, which will be degraded at a rate that does not harm the host and results in corrosion rate close to the rate of bone regeneration. Based on this, the study of corrosion of biomaterials proves relevant to understand the consequences of their use in the human body. Testing results showed that pure magnesium samples were more susceptible to corrosion than rare earth magnesium alloys. Know that magnesium is corroded in pure state and bound with rare earths, making possible the application as biometal.