Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第17卷    第7期    总第100期    2007年7月

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文章编号:1004-0609(2007)07-1053-05
AZ31镁合金表面液相渗铝的工艺与性能
谭成文1, 2,郭冠伟2,王潇屹2,王富耻2,才鸿年1, 2

(1. 北京理工大学 材料科学与工程学院, 北京100081;
2. 北京航空航天大学 材料科学与工程学院, 北京100083
)

摘 要:

采用液相扩渗技术在挤压态AZ31镁合金表面快速渗入铝,在合金表面获得过共晶渗层,并对渗层的成分、相组成、扩渗过程、纳米硬度和腐蚀性能进行分析。结果表明:AZ31镁合金在480 ℃热扩渗铝过程中发生了“熔化—凝固”变化,渗层为典型的过共晶组织;渗铝层含有Mg17Al12相和镁的铝饱和固溶体,这种渗层具有较高的纳米硬度和较好的耐腐蚀性能;通过提高扩渗温度进行液相扩渗可以大大提高扩渗速度,但由于快速凝固收缩会造成表层产生起伏现象,控制冷却速度可以将表层起伏控制在可接受的范围。

 

关键字: AZ31镁合金;过共晶渗层;耐蚀性;纳米硬度

Processes and properties of liquid aluminized
coating on AZ31 magnesium alloy
TAN Cheng-wen1, 2, GUO Guan-wei2, WANG Xiao-yi2,
WANG Fu-chi2, CAI Hong-nian1, 2

1. School of Materials Science and Engineering, Beijing Institute of Technology,
Beijing 100081, China;
2. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics,
Beijing 100083,China

Abstract:Liquid diffusion technology was used to aluminize on the surface of AZ31 magnesium alloy. The hypereutectic aluminized coating was obtained. The forming mechanism and properties of aluminized coating were studied by analyzing the component, phase state, nanoindentation hardness and corrosion resistance. The results show that a solidification-melting process occurs on the surface of AZ31 magnesium alloy when it is aluminized at 480 ℃. Mg17Al12 and Mg-Al supersaturated solid solution exist in the aluminized coating, and the coating nanoindentation hardness is about 3 times higher than that of AZ31 magnesium matrix, at the same time the corrosion resistance is improved obviously. Aluminizing in liquid phase may improve the diffusion velocity but up-and-down surface is formed due to surface solidification shrinkage from liquid phase, which can be controlled by reducing the cooling velocity.

 

Key words: AZ31 magnesium alloy; hypereutectic coating; corrosion resistance; nanoindentation hardness

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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