Abstract

The effect of anodizing temperature (10–50°C) at each particular stage of the anodizing process of the commercial AA5052 in 0.4 M H₃PO₄ at 30 V is studied in relation to the concentration of Mg species in the oxide layer. An advantageous behavior of the alloy is observed in comparison with pure aluminum, especially at 30°C. However, an impediment of anodizing is observed, leading to a reduction of the benefits of AA5052, which is correlated with a reduction in the Mg/(Mg + Al) atomic ratio for the oxide layer compared to the bulk alloy estimated by SEM/EDS analysis. These phenomena become more intense as the anodizing time and temperature rise. For example, a thrice higher oxide layer thickness at stage III in comparison with pure aluminum becomes twice higher at stage IV at 30°C. The duration of stage III is affected, but not that of stages I and II, which are completed in a short time and in which only a slight retardation of the increase in the density of the consumed electric charge was observed. The porosity increases with time but at the end of stage III reduces slightly, at T above 30°C, in spite of the general aspect that it remains stable or increases slightly with temperature.

中文翻译：

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商业AA5052在磷酸溶液中阳极氧化过程中的电化学行为与膜中镁物种含量的关系的研究

摘要

在0.4 MH ₃ PO ₄中，商用AA5052阳极氧化工艺的每个特定阶段的阳极氧化温度（10–50°C）的影响研究了在30 V下与氧化物层中Mg种类的浓度有关的情况。与纯铝相比，观察到该合金的有利性能，尤其是在30℃下。然而，观察到阳极氧化的障碍，导致AA5052的益处降低，与通过SEM / EDS估算的块状合金相比，氧化物层的Mg /（Mg + Al）原子比降低了分析。随着阳极氧化时间和温度的升高，这些现象变得更加强烈。例如，在第三阶段，与纯铝相比，第三阶段的氧化物层厚度高30倍，而在第四阶段则高出两倍。第三阶段的持续时间会受到影响，但第一阶段和第二阶段的持续时间不会受到影响，它们在短时间内完成，并且只观察到了所消耗电荷密度的增加的轻微延迟。孔隙度随时间增加，但在第三阶段结束时略有降低，尽管一般情况下，T仍在30°C以上，但保持稳定或随温度而略有增加。