Effect of anodic oxidation on fatigue performance of 7075-T6 alloy
Effect of anodic oxidation on fatigue performance of 7075-T6 alloy
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DOI：
10.1016/j.surfcoat.2008.06.049
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发表时间：
2008-07-30
影响因子：
5.4
通讯作者：
Genel, K.
中科院分区：
文献类型：
--
作者：
Cirik, E.;Genel, K.
通过在95Hz下进行一系列旋转弯曲疲劳试验，研究了阳极氧化对预腐蚀和未腐蚀的7075 - T6合金疲劳性能的影响。具有不同涂层厚度（6μm、12μm和23μm）的阳极氧化试样在3.5 wt.%的NaCl溶液中暴露6小时、48小时、96小时和240小时。结果表明，氧化有降低疲劳性能的趋势。疲劳强度随着涂层厚度的增加而降低；对于23μm厚的涂层，疲劳强度降低了约40%。观察到氧化减轻了点蚀。最厚的涂层具有优异的耐腐蚀性。对预腐蚀试样进行的疲劳试验表明，除了具有最厚涂层的试样外，涂层试样的疲劳寿命受预腐蚀的显著影响。当比较预腐蚀的裸样和涂层试样时，涂层仅在高周疲劳（>10⁵）时提高了疲劳性能，而在低周疲劳阶段降低了疲劳性能。（C）2008 Elsevier B.V.保留所有权利。
Effect of anodic oxidation on fatigue performance of 7075-T6 alloy for pre-corroded and non-corroded specimens has been investigated by conducting a series of rotary bending fatigue tests at 95 Hz. The anodized specimens with different coating thickness (6,12 and 23 pm) were exposed to 3.5 wt.% NaCl solution for 6, 48, 96 and 240 h. The results indicate that oxidation has a tendency to decrease the fatigue performance. Fatigue strength was reduced with increasing coating thickness; approximately 40% reduction for a 23 pm thick coating was obtained. It was observed that oxidation mitigated pitting corrosion. Superior corrosion resistance was obtained for the thickest coating layer. Fatigue tests with pre-corroded specimens showed that fatigue life of coated specimens was significantly affected by pre-corrosion, except for the specimen with the thickest coating layer. When the pre-corroded bare and coated specimens were compared, the coating improved the fatigue performance in high cycle fatigue (>10(5)) only and it degraded the fatigue performance in low cycle regime. (C) 2008 Elsevier B.V. All rights reserved.