Study on Corrosion Behavior of 7075 Aluminum Alloy with Retrogression and Reaging Using Taguchi Method

The 7075 aluminum alloy was an important structural material in the field of aeronautics and astronautics. With the development of this field, the requirements for its comprehensive properties were increasing. A novel casting method, the impact jet solid-liquid compound casting, was adopted to fabricate the 3A21/7075 aluminum alloy cladding material. Retrogression and reaging (RRA) treatment was further applied to the 3A21/7075 aluminum alloy cladding material in order to investigate the influence of RRA on microstructure and microhardness of the 3A21/7075 aluminum alloy cladding material. Then, the electron backscattered diffraction (EBSD) technique and the transmission electron microscope (TEM) together with the energy dispersive spectrometer (EDS) and the hardness test were utilized to analyze the influence of RRA treatment on microstructure and hardness of the 3A21/7075 aluminum alloy cladding material. The research results showed the 3A21/7075 aluminum alloy cladding material had better deformability. The amount of fine and dispersed phases precipitated in grains was in favor of improving the comprehensive mechanical properties of the 3A21/7075 aluminum alloy cladding material. This research might provide data and a theoretical approach for the engineering application of the 3A21/7075 aluminum alloy cladding material.

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Effect of Laser Shock Processing on Electrochemical Corrosion Behavior of 7075 Aluminum Alloy Plasma Arc Weldments

Chinese Journal of Lasers ◽

10.3788/cjl201542.1203006 ◽

2015 ◽

Vol 42 (12) ◽

pp. 1203006

Author(s):

王江涛 Wang Jiangtao ◽

张永康 Zhang Yongkang ◽

陈菊芳 Chen Jufang ◽

周金宇 Zhou Jinyu ◽

卢雅琳 Lu Yalin ◽

...

Keyword(s):

Aluminum Alloy ◽

Corrosion Behavior ◽

Electrochemical Corrosion ◽

7075 Aluminum Alloy ◽

Plasma Arc ◽

Laser Shock ◽

Laser Shock Processing ◽

Electrochemical Corrosion Behavior ◽

Shock Processing

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The Effect of Ultraviolet Wavelength on Corrosion Behavior of 7075 Aluminum Alloy in the Marine Atmospheric Environment

International Journal of Chemical Engineering ◽

10.1155/2021/5520448 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Yanyu Cui ◽

Yuning Gao ◽

Yongxiang Qin ◽

Xiaoyu Shi

Keyword(s):

Aluminum Alloy ◽

Corrosion Behavior ◽

Salt Spray ◽

Atmospheric Environment ◽

Ultraviolet Rays ◽

7075 Aluminum Alloy ◽

Marine Atmosphere ◽

Accelerated Corrosion ◽

Ultraviolet Wavelength ◽

Oxygen Atoms

The influence of ultraviolet rays on the corrosion behavior of 7075 aluminum alloy in the marine atmosphere was studied by salt spray corrosion test. Electrochemical methods and surface analysis techniques were used to analyze and compare the corrosion laws of 7075 aluminum alloy in the marine atmosphere under ultraviolet radiation with wavelengths of 0 nm, 185 nm, 254 nm, and 365 nm. The results showed that ultraviolet light irradiation could promote the corrosion of 7075 aluminum alloy. Oxygen was prone to chemical reactions to form oxygen atoms after being irradiated by ultraviolet rays, and oxygen atoms recombined with oxygen to form ozone in the marine atmosphere. The 7075 aluminum alloy in the marine atmosphere accelerated corrosion due to the increasing ozone content. Although there were passivation films with different degrees of protection on the surface of aluminum alloy under ultraviolet irradiation, the surface of 7075 aluminum alloy in the marine atmosphere failed to form a stable passivation film after pitting, and the corrosion rate was the fastest when the ultraviolet wavelength was 185 nm.

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