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首页> 外文期刊>International Journal of Technology >Degradation Behavior of Coatings Formed by the Plasma Electrolytic Oxidation Technique on AZ61 Magnesium Alloys Containing 0, 1 and 2 wt% Ca
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Degradation Behavior of Coatings Formed by the Plasma Electrolytic Oxidation Technique on AZ61 Magnesium Alloys Containing 0, 1 and 2 wt% Ca

机译：等离子体电解氧化技术在含0、1和2 wt％Ca的AZ61镁合金上的降解行为

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摘要

The characteristics of coatings formed by Plasma Electrolytic Oxidation (PEO) are affected by the composition of metal substrates. In this work, the effect of alloying element Ca (0, 1 and 2 wt%) on the degradation behavior and apatite-forming ability of PEO coated AZ61 magnesium alloys was clarified by means of polarization measurements in 0.9% NaCl solution and an in-vitro test in Simulated Body Fluid (SBF), respectively. The AZ61 alloys were subjected to plasma electrolytic oxidation at a constant current of 200 A/m2 at 25°C for 8 min in 0.5 M Na3PO4 solution. The surface investigation suggested no significant effect of Ca content on the morphology of the PEO coating formed on the AZ61 specimens. The coatings exhibited an eruption-like structure decorated with micropores and microcracks. Their average thicknesses were 13.2, 17.4 and 14.3 μm for AZ61, AZ61-1Ca and AZ61-2Ca, respectively. The polarization measurements showed no significant difference in the corrosion potentials (-1.60 VAg/AgCl) and corrosion current densities (1.61×10-5 A cm-2) of all the coated specimens. Similarly, there was no significant effect of Ca on the apatite-forming ability in SBF, as indicated by the lack of apatite deposition on all the coated specimens after 14 days of immersion. Further sealing of the PEO coatings by chemical treatment in NaOH solution is suggested to enhance the corrosion resistance.
机译：通过等离子体电解氧化（PEO）形成的涂层的特性会受到金属基材组成的影响。在这项工作中，合金元素Ca（0、1和2 wt％）对PEO涂层AZ61镁合金的降解行为和磷灰石形成能力的影响通过在0.9％NaCl溶液中和分别在模拟体液（SBF）中进行体外测试。 AZ61合金在0.5 M Na3PO4溶液中于200°C / m2的恒定电流在25°C下进行8分钟的等离子电解氧化。表面研究表明，Ca含量对在AZ61试样上形成的PEO涂层的形态没有明显影响。涂层显示出带有微孔和微裂纹的类似喷发的结构。 AZ61，AZ61-1Ca和AZ61-2Ca的平均厚度分别为13.2、17.4和14.3μm。极化测量结果表明，所有涂层样品的腐蚀电位（-1.60 VAg / AgCl）和腐蚀电流密度（1.61×10-5 A cm-2）均无显着差异。同样，Ca对SBF中的磷灰石形成能力没有显着影响，浸入14天后所有涂覆的样品上磷灰石沉积均不足，这说明了这一点。建议在NaOH溶液中通过化学处理进一步密封PEO涂层，以增强耐腐蚀性。

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