Tratamientos químicos de conversión para la protección de magnesio biodegradable en aplicaciones temporales de reparación ósea

Abstract

The present study was developed to improve the corrosion resistance of pure magnesium by applying chemical conversion coatings. Carbonate and fluoride layers were generated by immersion in solutions of NaHCO3 of concentration 9 wt.% and HF of concentration 48 wt.%, respectively. Corrosion resistance of the coated samples was evaluated in comparison with that of the uncoated substrate by electrochemical techniques in a physiological solution (PBS). Results have shown that the carbonate coating is not viable to be used for protecting magnesium against corrosion. On the contrary, the fluoride magnesium coating significantly increases the corrosion resistance of magnesium in physiological medium. The high compactness and adherence to the base metal of the MgF2 layer produced by this simple chemical conversion treatment confer the protective properties to the coating.