Fabrication of Al coating for corrosion protection of Mg−Zn−Al−Sn−Mn alloy based on cold spraying process

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI:10.1016/S1003-6326(24)66531-3

Liang CHEN, Yi-hao BAO, Zhi-gang LI, Li-hua QIAN, Guo-qun ZHAO, Cun-sheng ZHANG

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Abstract

Al coating was fabricated on the surface of Mg−Zn−Al−Sn−Mn alloy by cold spraying process to enhance its corrosion resistance. The effects of temperature and pressure of working gas on the microstructure and corrosion behaviors of Al coating were investigated. The results show that as gas temperature and pressure increase, the densification and thickness of Al coating obviously increase. High gas temperature declines the critical velocity of powder deposition and increases the deposition efficiency. High gas pressure not only improves the quality of mechanical bonding, but also provides strong tamping effect on the deposited coating. Due to the reduction of porosity, the corrosion resistance of Al coating is improved with the increase of gas temperature and pressure. The corrosion products of Al(OH)₃ and Al₂O₃ can block the pores in Al coating and act as physical barriers to corrosion, which effectively protects Mg alloy from being corroded.

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基于冷喷涂工艺制作用于保护镁锌铝锡锰合金的铝涂层

通过冷喷涂工艺在镁锌铝锡锰合金表面制作了铝涂层，以增强其耐腐蚀性。研究了工作气体的温度和压力对铝涂层微观结构和腐蚀行为的影响。结果表明，随着气体温度和压力的增加，铝涂层的致密化程度和厚度明显增加。高气体温度降低了粉末沉积的临界速度，提高了沉积效率。高气体压力不仅能提高机械结合质量，还能对沉积涂层产生强烈的夯实作用。由于孔隙率的降低，随着气体温度和压力的增加，铝涂层的耐腐蚀性能也得到了改善。Al(OH)3 和 Al2O3 的腐蚀产物可以堵塞 Al 涂层中的孔隙，成为腐蚀的物理屏障，从而有效保护镁合金免受腐蚀。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.