Effect of Zn content on corrosion behavior of Mg-Y-Zn alloys

J. Min. Metall. Sect. B-Metall., 58 (1) (2022) 51-61 DOI:10.2298/JMMB210525048S
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Available online 12 October 2021
(Received 25 May 2021; Accepted 05 October 2021)
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Abstract

The microstructure, corrosion behavior, and electrochemical behavior of as-cast Mg-4Y-xZn (x=1,2,3,4 wt.%) are studied by SEM, weight loss and electrochemical tests. Mg12YZn (X), Mg3Y2Zn3 (W) and Mg24Y5 constitute the phase composition system of the alloy. When Zn content is 1 wt.%, all tests reveal that alloy has the optimal corrosion performance. The second phase in these alloys, due to their nobler nature than α-Mg, exists as a cathode during the corrosion process, so that α-Mg preferentially occurs corrosion to accelerate the formation of corrosion pits. After soaking in 3.5 wt.% NaCl solution for some time, the stability of the W phase changed, and gradually dissolved, which was finally removed by chromic acid used for removal of corrosion products. In addition, X phase can be used as an anode in the micro-galvanic cells formed with W phase to reduce the corrosion rate of α-Mg and thus improve the corrosion performance of the alloy.

Keywords: Mg-Y-Zn; Second phase; Corrosion behaviors; Electrochemical behaviors
Correspondence Address:
X.-Q. Liu,
a College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China; b Jiangsu (Zhongyi) Engineering Research Center of Light Alloy Precision Die Casting, Changshu, Jiangsu, China; ,
email: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

 

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