Microstructure and corrosion properties of the laser cladding Al-TiC composite coating on AZ31 magnesium alloy

被引：0
|
作者：
Liu F. [1 ,2 ]
Ning X. [3 ]
Bai Y. [3 ]
Shen Z. [4 ]
Chen H. [4 ]
机构：
[1] College of Energy Engineering, Yulin University, Yulin
[2] Yulin Key Laboratory of Metal Matrix Composites and Remanufacturing Technology, Yulin University, Yulin
[3] School of Chemistry and Chemical Engineering, Yulin University, Yulin
[4] School of Materials Science and Engineering, Northwestern Polytechnical University, Xi′an
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Al-TiC composite coating; AZ31; alloy; corrosion resistance; laser cladding; microstructure;
D O I：
10.13801/j.cnki.fhclxb.20220410.002
中图分类号：
学科分类号：
摘要：
In order to enhance the surface corrosion resistance of the AZ31 magnesium alloy, the defect-free Al-TiC composite coatings were prepared on AZ31 magnesium alloy using laser cladding technology. The influences of Al-TiC compositions with different contents on the phase composition, microstructure and corrosion resistance of the Al-TiC composite coatings were investigated. The results indicate that a large number of Al12Mg17, Mg2Al3 and TiC phases are produced in the Al-TiC composite coating. The microstructure of the composite coating characterizes as a continuous network distribution. With the decrease of the Al content in the composite powder, the contents of the Al12Mg17, Mg2Al3 and TiC phases in the composite coating gradually increase, and the network-like distribution characteristics of the microstructure in the composite coating become more uniform and continuous. In addition, a sound metallurgical bonding interface is prepared between the composite coating and the AZ31 substrate. The corrosion resistance of the Al-TiC composite coating prepared using the laser cladding technology is significantly enhanced compared to that of the AZ31 substrate. The self-corrosion potential increased from −1.563 V of the AZ31 substrate to −1.144 V of the Al-TiC composite coating, whereas the self-corrosion current decreased from 1.55×10−4 A to 2.63×10−6 A. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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页码：959 / 969
页数：10
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