The aluminum alloy components of the high-speed railway catenary, when exposed to the corrosive media in coastal regions, are confronted with a significant issue of corrosion-fatigue failure. Therefore, this study prepares a kind of composite ceramic coating formed by combining shot peening surface nanocrystallization pre-treatment, micro-arc oxidation (MAO) ceramic coating, and acrylic resin sealing post-treatment on 6082-T6 aluminum alloy used for high-speed railway catenary. Then, the corrosion and corrosion-fatigue properties of composite ceramic coated 6082-T6 aluminum alloy are investigated. Results indicate that the pre-treatment increases the thickness of ceramic coating, however results in larger internal defects connecting ceramic coating’s outer surface, leading to inferior corrosion resistance compared to plain ceramic coatings. However, owing to the presence of compressive residual stress and grain-refined layers within the substrate beneath the ceramic coating, ceramic coated specimens subjected to the pre-treatment exhibit superior corrosion-fatigue properties compared to plain coated specimens. Additionally, the post-treatment effectively reduces coating porosity and enhances corrosion resistance. In conclusion, the composite ceramic coating in this paper is demonstrated to exhibit a combination of superior corrosion resistance, fatigue and corrosion-fatigue properties.

中文翻译：

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结合表面纳米化前处理、微弧氧化和密封后处理形成的复合陶瓷涂层铝合金的腐蚀及腐蚀-疲劳性能


高速铁路接触网的铝合金构件在沿海地区暴露在腐蚀性介质中时，面临着腐蚀疲劳失效的重大问题。因此，本研究制备了一种在高速铁路接触网用6082-T6铝合金上结合喷丸表面纳米晶前处理、微弧氧化（毛）陶瓷涂层和丙烯酸树脂密封后处理形成的复合陶瓷涂层。然后，研究了复合陶瓷涂层 6082-T6 铝合金的腐蚀和腐蚀-疲劳性能。结果表明，预处理增加了陶瓷涂层的厚度，但导致连接陶瓷涂层外表面的内部缺陷更大，导致与普通陶瓷涂层相比，耐腐蚀性较差。然而，由于陶瓷涂层下方的基材内存在压缩残余应力和晶粒细化层，与普通涂层试样相比，经过预处理的陶瓷涂层试样表现出优异的腐蚀疲劳性能。此外，后处理有效降低了涂层孔隙率并增强了耐腐蚀性。总之，本文中的复合陶瓷涂层表现出优异的耐腐蚀性、疲劳性和腐蚀疲劳性能。