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Effect of anodized layer on fatigue mechanism of magnesium alloy

机译：阳极氧化层对镁合金疲劳机理的影响

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Anodic coatings generally degrade the stress-life (S-N) fatigue performance of a material. So far many research works have been carried out on the effect of anodic coating on fatigue performance but very few of them deal with the possible effect of anodizing thickness on the fatigue behavior. Hence, rotating bending fatigue test was conducted in laboratory air under the stress ratio, R, of 0.1 using smooth specimen with anodized film thickness of 15 and 5μm. Fatigue strength of anodized specimen decreased considerably as compared with that of the untreated one. But the degradation of fatigue life was much more pronounced in 15 μm coating compared to the 5 μm coated samples. It was pointed out through study that the fatigue strength of anodized alloy was controlled by the crack initiation behavior in the coating and the result of the interrupted fatigue test showed a much faster crack initiation time in anodized materials compared with that of the base metal. Crack imitation time increased with decreasing coating thickness causing an improvement in fatigue behavior. Fractographic observation also revealed the presence of many flaws in 15μm coating compared to that of the 5 μm one that also lead to better fatigue performance of the later under low humidity condition.
机译：阳极涂层通常降低材料的应力 - 寿命（S-N）疲劳性能。到目前为止，许多研究工作已经开始对阳极涂层对疲劳性能的影响，但是它们很少有人处理阳极氧化厚度对疲劳行为的可能影响。因此，使用具有阳极氧化膜厚度为15和5μm的阳极氧化膜厚度的应力比R，旋转弯曲疲劳试验。与未经处理的阳极氧化试样的疲劳强度相比，阳极氧化试样的强度显着降低。但与5μm涂覆的样品相比，在15μm涂层中，疲劳寿命的降解更加明显。通过研究指出的是，通过涂层中的裂纹引发行为来控制阳极氧化合金的疲劳强度，并且中断疲劳试验的结果显示与基础金属相比阳极氧化材料中的更快的裂纹引发时间。裂纹模仿时间随着涂层厚度的降低而导致疲劳行为的提高。与5μm的涂层相比，Fretography观察还揭示了15μm涂层中许多缺陷的存在，这也导致在低湿度条件下更好地疲劳性能。

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