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Improved Corrosion Protection of Magnesium Alloys AZ31B and AZ91 by Cold-Sprayed Aluminum Coatings
Journal of Thermal Spray Technology ( IF 3.2 ) Pub Date : 2021-01-04 , DOI: 10.1007/s11666-020-01128-0
R. P. S. Chakradhar , G. Chandra Mouli , Harish Barshilia , Meenu Srivastava

Magnesium (Mg) alloys have a high strength/weight ratio, high dimensional stability, good machinability, and the ability to be recycled. However, their poor corrosion resistance in humid environments limits their usage for exterior aerospace components. This study aims to improve the corrosion resistance of two Mg alloys (AZ31B and AZ91) by using aluminum coatings. The latter have been deposited by a low pressure and temperature cold spray process. An aluminum powder (60 wt%) with a particle size ranging between 1 and 8 µm and nickel powder (40 wt%) with a particle size of about 70 µm were blended and used as feedstock powder. The coating thickness was about 240 μm. Its densification was achieved by the in-situ hammering effect of the nickel particles. The shot-peening effect also resulted in an enhanced coating hardness. The microstructure, mechanical properties, and corrosion resistance of the coatings have been investigated. They showed that the aluminum had a face centered cubic structure. Potentiodynamic polarization tests were performed along with a combination of materials characterization techniques to assess the corrosion resistance of the coatings when immersed in a 3.5 wt% NaCl solution for long durations. The results revealed that the corrosion resistance increased with the immersion time because of the formation of a protective oxide layer on the surface. These results were supported by elemental and structural analyses. This study shows that cold-sprayed aluminum coatings are a promising candidate for enhancing the corrosion resistance of AZ31B and AZ91Mg alloys compared to other thermal spray processes.

中文翻译:

通过冷喷涂铝涂层改善镁合金 AZ31B 和 AZ91 的腐蚀保护

镁 (Mg) 合金具有高强度/重量比、高尺寸稳定性、良好的机械加工性和回收能力。然而,它们在潮湿环境中较差的耐腐蚀性限制了它们在外部航空航天部件中的使用。本研究旨在通过使用铝涂层来提高两种镁合金(AZ31B 和 AZ91)的耐腐蚀性。后者已通过低压和低温冷喷涂工艺沉积。将粒径在 1 至 8 µm 之间的铝粉 (60 wt%) 和粒径约为 70 µm 的镍粉 (40 wt%) 混合并用作原料粉末。涂层厚度约为 240 μm。它的致密化是通过镍颗粒的原位锤击效应实现的。喷丸效应还导致涂层硬度提高。微观结构,研究了涂层的力学性能和耐腐蚀性能。他们表明铝具有面心立方结构。动电位极化测试与材料表征技术的组合一起进行,以评估涂层长时间浸入 3.5 wt% NaCl 溶液时的耐腐蚀性。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。这项研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。并对涂层的耐腐蚀性进行了研究。他们表明铝具有面心立方结构。动电位极化测试与材料表征技术的组合一起进行,以评估涂层长时间浸入 3.5 wt% NaCl 溶液时的耐腐蚀性。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。这项研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。并对涂层的耐腐蚀性进行了研究。他们表明铝具有面心立方结构。动电位极化测试与材料表征技术的组合一起进行,以评估涂层长时间浸入 3.5 wt% NaCl 溶液时的耐腐蚀性。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。这项研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。动电位极化测试与材料表征技术的组合一起进行,以评估涂层长时间浸入 3.5 wt% NaCl 溶液时的耐腐蚀性。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。这项研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。动电位极化测试与材料表征技术的组合一起进行,以评估涂层长时间浸入 3.5 wt% NaCl 溶液时的耐腐蚀性。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。这项研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。该研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。结果表明,由于在表面形成了保护性氧化层,因此随着浸泡时间的延长,耐腐蚀性能增加。这些结果得到了元素和结构分析的支持。该研究表明,与其他热喷涂工艺相比,冷喷涂铝涂层是提高 AZ31B 和 AZ91Mg 合金耐腐蚀性的有希望的候选材料。
更新日期:2021-01-04
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