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Title:Influence of equal-channel angular pressing pass on microstructure and corrosion properties for 7075 aluminum alloy
Authors: Ding Wenwen  Li Tao  Wu Hewei 
Unit: Science and Technology College of Hubei University of Arts and Science 
KeyWords: 7075 aluminum alloy equal-channel angular pressing extrusion pass corrosion resistance grain refinement 
ClassificationCode:TG311
year,vol(issue):pagenumber:2019,44(9):146-150
Abstract:

7075 aluminum alloy was treated by equal-channel angular pressing (ECAP) and heat treatment, and the influences of ECAP pass on its microstructure and corrosion properties were observed by experimental method. The results show that after four passes of ECAP treatment, the grains are significantly refined and the second phase grows up. After solution aging, the grain size grows. The increase of ECAP pass increases the corrosion potential, reduces the corrosion current density, effectively improves the corrosion resistance of material, and improves the corrosion resistance of passivation film. When the deformation pass increases, the number and size of corrosion pits decrease, and a structurally complete oxidation film is formed to significantly enhance its corrosion resistance. After ECAP treatment, the degree of segregation at the grain boundary of the second phase reduces, and the size and mathematical properties of the rod-shaped second phase at the grain boundary significantly reduce to hinder the corrosion process of the grain boundary.
 

Funds:
“机电汽车”湖北省优势特色学科群2018年开放基金项目(XKQ2018063)
AuthorIntro:
丁文文(1986-),女,硕士,讲师 E-mail:330966532@qq.com
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