热处理对Mg-11Gd-3Y-0.6Ca-0.5Zr合金显微组织和腐蚀行为的影响

doi:10.11896/cldb.19070159

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Abstract In this paper, Mg-11Gd-3Y-0.6Ca-0.5Zr alloy was taken as the research object, and solid solution and aging heat treatment are performed. Metallographic microscope, scanning electron microscope with energy spectrum, X-ray diffractometer were used to analyze the microstructure and phase of the alloy before and after heat treatment and corrosion, and the static weight loss method and electrochemical test method were used to study the corrosion resistance of the alloy before and after heat treatment. The results show that the as-cast microstructure of the alloy is composed of α-Mg matrix and the coarse eutectic phases Mg₅Gd, Mg₂₄Y₅ and Mg₂Ca, which are distributed along the grain. In 3.5wt% NaCl solution, heat treatment significantly improves the corrosion resistance of the alloy. Among them, the corrosion rate of the aging alloy is the lo-west, the self-corrosion potential is the highest, the corrosion current density is the lowest, and the corrosion resistance of the alloy is the best, followed by the solid solution state and the casting state. The corrosion products on the surface of the alloy are mainly Mg(OH)₂.

Key words： Mg-11Gd-3Y-0.6Ca-0.5Zr solid solution aging microstructure corrosion

Published: 06 November 2020

CLC number:

TG146.2

Fund:National Natural Science Foundation of China (51571084, 51171059).

About author:: Shuai Zhangis a master student at Henan University of Science and Technology. His professional research direction is advanced magnesium alloy, which is mainly engaged in the design and development of high perfor-mance magnesium alloy.
Quan’an Liis currently a professor in Henan University of Science and Technology. His research interests are rare-earth functional materials, rare earth aluminum alloys, rare earth aluminum alloys and the surface mo-dification of rare earth materials. He has presided over more than 10 projects including the national natural scie-nce foundation of China, Henan outstan-ding talents fund and Henan outstanding youth fund. He has published more than 300 research papers, and he has been granted more than 20 national invention patents.

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	ZHANG Shuai
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	ZHU Hongxi
	CHEN Xiaoya
	WANG Songbo
	GUAN Haikun

Cite this article:

ZHANG Shuai,LI Quan’an,ZHU Hongxi, et al. Effect of Heat Treatment Process on Microstructure and Corrosion Behavior of Mg-11Gd-3Y-0.6Ca-0.5Zr Alloy[J]. Materials Reports, 2020, 34(20): 20070-20075.

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http://www.mater-rep.com/EN/10.11896/cldb.19070159 OR http://www.mater-rep.com/EN/Y2020/V34/I20/20070

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