中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 12 December 2025 |
（1. College of Materials Science and Engineering, Hohai University, Changzhou 213200, China;
2. Suqian Research Institute, Hohai University, Suqian 223800, China;
3. School of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu 215500, China;
4. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China）
Abstract:A balance between strength and corrosion resistance in 7xxx series aluminum (Al) alloys is difficult to achieve because of their diverse secondary phases. In this study, the Al-5Zn binary alloy was selected as a simplified representative of the 7xxx series Al alloys, and four distinct equal-channel angular pressing (ECAP) passes of 4, 8, 12, and 16 were used to adjust the Zn phase and dislocation distribution in the alloy. The corrosion behavior and mechanical properties of the alloy were evaluated by performing electrochemical and tensile tests as well as optical microscopy, scanning electron microscopy, and transmission electron microscopy. The results indicate that the Al-5Zn alloy exhibits the highest polarization resistance value and the lowest corrosion current density after 16 ECAP passes. Additionally, its overall mechanical properties with ultimate tensile strength of 224 MPa, yield strength of 199 MPa, and elongation of 21.3% are excellent. The fragmentation and uniform distribution of the Zn phase as well as the even distribution of dislocations contribute to exceptional corrosion resistance and mechanical properties.
Key words: Al-Zn alloy; corrosion resistance; Zn phase; dislocation; mechanical properties
