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In order to improve the corrosion resistance of biodegradable magnesium and AZ31 magnesium alloy implants, a phytic acid coating has been applied on both substrates and their protective effect against corrosion has been assessed. The morphology and the chemical nature of the conversion coating were analyzed by SEM/EDX, XRD and FTIR. The spectra showed that the conversion coating was amorphous, and it was composed of Mg, O, and P on magnesium surface, along with Al, Zn and C on AZ31 alloy. The main coating components were chelate compounds formed by phytic acid and metallic ions. The corrosion resistance of bare and coated samples was evaluated by potentiodynamic polarization technique in Hank's solution at 37 °C. The results indicate that phytic acid conversion coatings provided a very effective protection to the magnesium substrates studied. Copyright: © 2014 CSIC.Plan Nacional MAT 2008-06719-C03-01; MAT 2011-29152-C02-01Peer Reviewe

revista de metalurgia

Caracterización y comportamiento frente a la corrosión de recubrimientos de ácido fítico, obtenidos por conversión química, sobre substratos de magnesio en solución fisiológica