| LIU Zhi-hao,ZOU Tian-chun,LI Ye,JU Yue-zhang.Effect of Plasma Treatment on Surface Properties and Bonding Performance of AA7075 Aluminum Alloy[J],51(11):452-461 |
| Effect of Plasma Treatment on Surface Properties and Bonding Performance of AA7075 Aluminum Alloy |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.11.043 |
| KeyWord:AA7075 aluminum alloy plasma surface treatment the bonding performance surface wettability surface profile surface activity |
| Author | Institution |
| LIU Zhi-hao |
College of Safety Science and Engineering, Tianjin , China |
| ZOU Tian-chun |
College of Safety Science and Engineering, Tianjin , China |
| LI Ye |
College of Aeronautical Engineering, Civil Aviation University of China, Tianjin , China |
| JU Yue-zhang |
College of Safety Science and Engineering, Tianjin , China |
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| Abstract: |
| This paper aims to improve the bonding performance and surface characteristics of AA7075 aluminum alloy and optimize the bonding strength. The surface treatment of AA7075 aluminum alloy was carried out by using low-temperature air plasma treatment equipment, and the plasma treatment distance and treatment speed were changed. The bonding strength of AA7075 aluminum alloy was tested by bonding and tensile shear experiments, and SEM, AFM, contact angle measuring instrument, FTIR, XPS, and other testing techniques were used to characterize and analyze the surface physicochemical properties of aluminum alloy as well as the effect of plasma treatment on the surface properties of AA7075 aluminum alloy was studied. The results show that the bonding strength of AA7075 aluminum alloy increases with the decrease of plasma treatment distance and treatment speed. When the plasma treatment distance d was 5 mm and the speed v was 2 mm/s, the strength of AA7075 aluminum alloy bonded joint was the largest, which was 14.56 MPa, and it was about 80% and 200% higher than that of acetone treatment and untreated treatment respectively. The tensile load displacement curve and failure morphology of the joint show that the cohesive failure process of the joint increases, the adhesive was distributed on both sides of the aluminum alloy, and the failure mode of the bonded joint changes from single interface failure to adhesive cohesive failure, indicating that plasma treatment can significantly improve the bonding strength of AA7075 aluminum alloy. With the gradual reduction of plasma treatment distance, some pollutants on the surface of aluminum alloy can be effectively removed, the maximum height difference of the surface is reduced from 221.8 nm to 121.6 nm, the surface micron rough contour is increased. At the same time, the minimum water contact angle of aluminum alloy surface can be reduced to 26°, the surface free energy and polarity component are increased, and the wettability and surface adsorption properties of aluminum alloy surface are improved, It shows that plasma treatment can improve the surface wettability and adhesion of AA7075 aluminum alloy and increase the interfacial bonding area between aluminum alloy and adhesive. In addition, after plasma treatment, the proportion of C1s, O1s, AL2p, N1s, Mg1s and other elements on the surface of AA7075 aluminum alloy changes, the content of C—C, C—O and O—C==O groups on the surface decreases, and the polar groups such as OH and Al—O increased, indicating that plasma treatment can increase the polar groups and surface activity on the surface of aluminum alloy and form chemical bonding between aluminum alloy and adhesive, so as to improve the interfacial bonding strength between them. |
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