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Characterization and corrosion behavior of phytic acid coatings, obtained by chemical conversion on magnesium substrates in physiological solution

机译:通过在生理溶液中对镁基质进行化学转化获得的植酸涂层的特性和腐蚀行为

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摘要

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.
机译:为了提高可生物降解的镁和AZ31镁合金植入物的耐腐蚀性,已在两种基材上均施加了植酸涂层,并评估了它们的抗腐蚀作用。用SEM / EDX,XRD和FTIR分析了转化膜的形貌和化学性质。光谱表明,转化膜是非晶态的,由镁表面的Mg,O和P以及AZ31合金的Al,Zn和C组成。主要涂层成分是由植酸和金属离子形成的螯合物。通过在Hank溶液中于37°C下通过电位动力极化技术评估裸露和涂层样品的耐腐蚀性。结果表明,植酸转化膜为所研究的镁基质提供了非常有效的保护。版权:©2014 CSIC。

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