Estudio de superficies de magnesio modificadas con fosfatos y películas poliméricas para aplicaciones médicas

Abstract

Magnesium and its alloys have been of scientific interest in bone regeneration due to its resorbable, biocompatible and mechanical characteristics. However, its electrochemical activity is a challenge; surface modification treatments are sought through biopolymers or conversion treatments to reduce its corrosion rate. The objective of this research was to evaluate the corrosive behavior of magnesium in simulated physiological solution through electrochemical techniques through a phosphating interface and a chitosan-grenetine film. The phosphating treatment was carried out by chemical conversion pH 10, 11 and 12 and a film was prepared by polymer solution and convective drying. The surfaces were characterized by DRX, RAMAN, SEM-EDS. Combined phases of phosphates with rugose and porous morphology with non-conductive properties were obtained to relate to the electrochemical response of the phosphate interface with different areas of pure magnesium, estimating the actual phosphated area. The biopolymeric film induces the corrosion process at a rate of approximately a quarter of magnesium phosphate during 4 weeks of exposure in the physiological medium. Improving the adhesion properties of the biopolymer film and the porosity could contribute to bone regeneration during this corrosive process.