Microstructure and properties of AL-SI alloy cladding on AZ91D magnesium alloy by low heat input DC-PMIG welding

被引：12
|
作者：
Liu, Chekai [1 ]
Li, Zhiyong [1 ]
Pei, Xiaolong [1 ]
Yang, Liuqing [1 ]
Zhang, Yingqiao [1 ]
Wei, Shouzheng [1 ]
机构：
[1] North Univ China, Coll Mat Sci & Engn, Taiyuan 030051, Shanxi, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2017年 / 329卷
关键词：
AZ91D magnesium alloy; Al-Si alloy; DC-PMIG welding; Low heat input; Microstructure; MECHANICAL-PROPERTIES; CORROSION-RESISTANCE; WEAR-RESISTANCE; ALUMINUM; COATINGS;
D O I：
10.1016/j.surfcoat.2017.09.030
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The corrosion resistance of magnesium is an important research field for useful application in industry. In order to form a corrosion resistant layer with enough thickness and strong adhesion on the surface of magnesium alloy, a low cost and efficient production process direct current (DC) pulse metal inert gas (PMIG) welding was used to deposit Al-Si alloy on AZ91D magnesium matrix. The heat input was strictly controlled to form compact metallurgical coating with a maximum thickness of 1.8 mm. The composite layer can be divided clearly into three zones: Mg matrix zone, the transition zone composed of a variety of intermetallic compounds (Al22Mg17, Al3Mg2 and Mg2Si etc.), and alloy coating (alpha-Al dendrites, Al-Si eutectic and Mg2Si.) zone. Furthermore, the properties of the alloy coating zone were investigated by both micro-hardness test and electrochemical corrosion. The micro-hardness of the coating is almost two times higher than that of the matrix and the corrosion resistance of the coating was greatly improved compared with that of the matrix.
引用
收藏
页码：42 / 48
页数：7
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