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Microarc Oxidation Coating Combined with Surface Pore-Sealing Treatment Enhances Corrosion Fatigue Performance of 7075-T7351 Al Alloy in Different Media

机译:微弧氧化涂层结合表面孔密封处理增强了7075-T7351铝合金在不同介质中的腐蚀疲劳性能

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摘要

Rotating bending fatigue tests have been performed to evaluate the corrosion fatigue performance and its influence factors of 7075-T7351 Al alloy in different media, namely air and a 5.0 wt % NaCl aqueous solution. All samples were coated by microarc oxidation (MAO) coating technology; some samples were followed by an epoxy resin pore-sealing treatment. Microscopic analyses of the surfaces and fracture cross-sections of samples were carried out. The results reveal that the sample with a MAO coating of 10 μm thickness and pore-sealing treatment by epoxy resin possesses optimal corrosion fatigue performance in the different media. The MAO coating with a pore-sealing treatment significantly improves the corrosion fatigue limit of 7075-T7351 Al alloy.
机译:已经进行了旋转弯曲疲劳试验,以评估7075-T7351铝合金在不同介质(即空气和5.0 wt%NaCl水溶液)中的腐蚀疲劳性能及其影响因素。所有样品均通过微弧氧化(MAO)涂层技术进行涂层;一些样品之后进行环氧树脂孔密封处理。对样品的表面和断裂横截面进行了微观分析。结果表明,具有10μm厚度的MAO涂层并通过环氧树脂进行孔密封处理的样品在不同介质中具有最佳的腐蚀疲劳性能。经过孔隙密封处理的MAO涂层显着提高了7075-T7351铝合金的腐蚀疲劳极限。

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