Effect of Heat Treatment Process on Microstructure and Corrosion Behavior of Mg-11Gd-3Y-0.6Ca-0.5Zr Alloy
ZHANG Shuai1, LI Quan’an1,2, ZHU Hongxi1,2, CHEN Xiaoya1,3, WANG Songbo1, GUAN Haikun1
1 School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023, China 2 Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology, Henan Province, Luoyang 471023, China 3 School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 740048, China
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.
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2020, Vol. 34 
