摘要
为提高镁合金表面耐蚀性，采用火焰喷涂与高能电子束重熔技术在AZ91D镁合金表面制备了A1涂层。分析了涂层的微观组织结构和各区域的元素分布情况，测试了涂层硬度与耐蚀性。结果表明，在电子束重熔过程中，Al—Mg元素在涂层与基体间产生了明显的扩散，呈现交错的界面结合特征。涂层主要由熔覆区、合金化区和热影响区三部分组成，其中合金化层为典型的树枝晶结构。由于涂层中形成大量金属间化合物如Mg2Al3、Mg17Al12，使硬度由基体的70～80 HV0.05提高到220 HV0.06。这些相的存在也显著的提高了AZ91D镁合金表面的耐蚀性。
in order to enhance corrosion resistance of Mg alloy, aluminum was coated on AZ91D magnesium alloy using flame spray and electron beam remelting. The microstructure and composition of the coating were analyzed in detail. The microhardness and corrosion resistance of the coating were tested. The results show that AI and Mg elements have obvious diffusion between coating and substrate, and the interface has a characteristic of interlaced bonding. The coating is mainly composed of cladding zone, alloying zone and transition zone. The alloying zone has a typical dendritic structure. Microhardness of the coating improves from 70---80 HV0.05 to 220 HV0.05 due to the formation of intermetallic compounds, such as Mg2Al3 and Mg17Al12. These phases also improve corrosion resistance of AZ91D alloy.
出处
《铸造技术》
CAS
北大核心
2008年第8期1056-1058,共3页
Foundry Technology
基金
重庆市科委应用基础项目:2006BB4391
关键词
镁合金
电子束喷涂
铝涂层
组织
Magnesium alloy
Electron beam spraying
AI coating
Microstructure
