刘志浩,邹田春,李晔,巨乐章.等离子体处理对AA7075铝合金表面特性及胶接性能的影响[J].表面技术,2022,51(11):452-461.
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].Surface Technology,2022,51(11):452-461 |
| 等离子体处理对AA7075铝合金表面特性及胶接性能的影响 |
| 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 |
| 中文关键词: AA7075铝合金 等离子体处理 胶接 表面润湿性能 表面轮廓 表面活性 |
| 英文关键词:AA7075 aluminum alloy plasma surface treatment the bonding performance surface wettability surface profile surface activity |
| 基金项目:国家自然科学基金(52071069) |
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| 中文摘要: |
| 目的 改善AA7075铝合金的胶接性能及表面特性，提高胶接强度，研究等离子体处理对AA7075铝合金表面特性的影响。方法 采用低温空气等离子体处理设备对AA7075铝合金进行表面处理，改变等离子体处理距离及处理速度，通过胶接及拉伸剪切试验对AA7075铝合金胶接强度进行测试，并利用SEM、AFM、接触角测量仪、FTIR、XPS等对铝合金表面的物化特性进行表征和分析，探究等离子体处理对铝合金胶接性能的影响及机理。结果 当等离子体处理距离d为5 mm，速度v为2 mm/s时，AA7075铝合金胶接接头强度最大为14.56 MPa，与丙酮处理及未处理相比，分别提高约80％、200%。接头拉伸载荷位移曲线及破坏形貌表明，接头内聚破坏程度增大，胶粘剂呈内聚破坏形态分布在铝合金两侧。随着处理距离从10 mm降低至5 mm，铝合金表面部分污染物可以有效清除，表面最大高度差从221.8 nm降低至121.6 nm，表面微米级粗糙轮廓增加。同时，表面水接触角从46°降低至26°，表面自由能及极性分量增加，铝合金表面润湿性及表面吸附性能提高。表面FTIR、XPS测试表明，等离子体处理可以改变AA7075铝合金表面C1s、O1s、Al2p、N1s、Mg1s等元素含量占比，表面C—C、C—O和O—C=O基团含量减少，OH、Al—O等极性基团增多，铝合金表面活性明显增加。结论 等离子体处理可以显著提高AA7075铝合金胶接强度，胶接接头失效模式由单一界面失效转变为胶粘剂内聚失效。等离子体处理通过改善AA7075铝合金表面润湿、黏附性能，增大粘结面积，同时提高表面极性基团及表面活性，使铝合金与胶粘剂胶接界面形成化学键合作用，从而提高其与胶粘剂界面的粘结强度。 |
| 英文摘要: |
| 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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