Influence of Rare Earth Element (Y) on Microstructure and Corrosion Behavior of Hot Extrusion AZ91 Magnesium Alloy

Yanan Cui; Yonghai Wang; Zhongyu Cui; Wenlong Qi; Jidong Wang; Pengfei Ju; Yang Zhao; Bin Liu; Tao Zhang; Fuhui Wang

doi:10.3390/ma13163651

Influence of Rare Earth Element (Y) on Microstructure and Corrosion Behavior of Hot Extrusion AZ91 Magnesium Alloy

Materials (Basel). 2020 Aug 18;13(16):3651. doi: 10.3390/ma13163651.

Authors

Yanan Cui¹, Yonghai Wang², Zhongyu Cui³, Wenlong Qi⁴, Jidong Wang⁴, Pengfei Ju⁵, Yang Zhao⁴, Bin Liu¹, Tao Zhang^{1

4}, Fuhui Wang^{1

4}

Affiliations

¹ Corrosion and Protection Laboratory, Key Laboratory of Superlight Materials and Surface Technology, Harbin Engineering University, Ministry of Education, Harbin 150001, China.
² Technical Office Department, Beijing Institute of Space Long March Vehicle, Beijing 100076, China.
³ School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China.
⁴ Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China.
⁵ Shanghai Aerospace Equipment Manufacture, Shanghai 200245, China.

Abstract

The influence of rare earth element (RE) Y on the microstructure and corrosion behavior of extruded AZ91 Mg alloy was surveyed via morphology characterization and corrosion performance measurements. The results indicate the corrosion resistance of the transversal section of AZ91 Mg alloy containing Y was improved compared with AZ91 Mg alloy without Y. The corrosion resistance of the longitudinal section of AZ91 Mg alloy with Y was lower than that of AZ91 Mg alloy without Y. The change of corrosion resistance can be attributed to the dispersion and volume fraction of the second phase, the effect of cathodic reduction rate, and the refined second phase.

Keywords: AZ91 Mg alloy; corrosion resistance; microstructure; rare earth element.

Abstract

Grants and funding