薛景辉,高东,张桂,周王凡.激光织构复合等离子体表面处理对PA66胶接性能的作用机理研究[J].表面技术,2025,54(9):204-213, 259.
XUE Jinghui,GAO Dong,ZHANG Gui,ZHOU Wangfan.Mechanism of Improving Bonding Performance of PA66 by Laser Texturing Combined with Plasma Surface Treatment[J].Surface Technology,2025,54(9):204-213, 259 |
| 激光织构复合等离子体表面处理对PA66胶接性能的作用机理研究 |
| Mechanism of Improving Bonding Performance of PA66 by Laser Texturing Combined with Plasma Surface Treatment |
| 投稿时间：2024-08-14 修订日期：2024-11-26 |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.09.017 |
| 中文关键词: PA66 激光织构 等离子体表面处理 胶接强度 接触角 元素分析 |
| 英文关键词:PA66 laser texturing plasma surface treatment bonding strength contact angle elemental analysis |
| 基金项目:国家自然科学基金(52105448);江苏省自然科学基金(BK20200912) |
| 作者 | 单位 |
| 薛景辉 | 江苏大学 机械工程学院，江苏 镇江 212013 |
| 高东 | 江苏大学 机械工程学院，江苏 镇江 212013 |
| 张桂 | 江苏大学 机械工程学院，江苏 镇江 212013 |
| 周王凡 | 江苏大学 机械工程学院，江苏 镇江 212013 |
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| Author | Institution |
| XUE Jinghui | School of Mechanical Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
| GAO Dong | School of Mechanical Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
| ZHANG Gui | School of Mechanical Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
| ZHOU Wangfan | School of Mechanical Engineering, Jiangsu University, Jiangsu Zhenjiang 212013, China |
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| 中文摘要: |
| 目的 提高聚酰胺66(PA66)的胶接强度。方法 利用脉冲激光在PA66板材表面进行激光织构，再对激光织构后的PA66板进行等离子体表面处理，通过单搭接拉伸剪切试验评价胶接强度。通过激光共聚焦显微镜观察分析表面形貌，利用X射线光电子能谱仪分析PA66表面的元素分布，并通过测量接触角研究PA66表面的润湿性。结果 未经表面改性的PA66的胶接强度为0.44 MPa。激光织构的最佳参数为激光功率P=7 W、线间距h=50 µm、扫描速度v=1 500 mm/s，等离子体表面处理的最佳参数为功率P=750 W、喷头高度H=11 mm、喷涂速度v=2 mm/s，在此参数下经激光织构和等离子体表面处理后其胶接强度分别提高到6.58 MPa和7.45 MPa。经激光织构复合等离子体表面处理后，胶接强度为8.67 MPa，相较于激光织构处理和等离子体表面处理分别提高了31.76%、16.38%。同时，相较于单等离子体表面处理，采用复合处理具有更好的工艺稳定性。经复合处理后，PA66的表面粗糙度显著提升，表面含氧量从2.92%提高到28.47%，表面接触角从89.7°降至13.9°。结论 通过激光织构在PA66表面制备了周期性沟槽结构，通过等离子体处理在PA66表面引入了大量的极性基团和含氧基团，在机械互锁力、对胶黏剂的吸附能力和化学键合力的协同作用下，PA66的胶接强度显著提升。 |
| 英文摘要: |
| Polyamide 66 (PA66) has been widely used due to its excellent mechanical properties. Due to its advantages of reduced structural weight, good sealing, and uniform stress distribution, adhesive bonding is suitable for connecting PA materials. The low surface energy and poor wettability result in poor bonding performance of PA66. The work aims to improve the bonding strength of PA66 by laser texturing combined with plasma surface treatment. The laser texturing experiments were carried out by a pulsed laser with a wavelength of 1 064 nm, a laser pulse width of 104 ns, a frequency of 20 kHz, a spot diameter of 50 µm, and an "S"-shaped scanning path. The low-temperature atmospheric pressure air plasma treatment equipment was used for plasma surface treatment, with a working pressure of 0.2-0.3 MPa. The mechanism of bonding performance improvement of PA66 was investigated through tensile shear experiments, contact angle testing, surface morphology observation, and XPS testing. The geometry of the specimen for the single lap shear test was shown in Fig.1. To ensure a constant thickness of the adhesive layer, glass microspheres with a diameter of 0.25 mm were added during bonding. The Taguchi method was used to optimize parameters for laser texturing. The hatch spacing and scanning velocity were the main factors affecting the bonding strength, while the laser power had a relatively low impact. The optimal laser texturing parameters were a laser power of 7 W, a hatch spacing of 50 µm, and a scanning velocity of 1 500 mm/s. The power (P), the height of plasma treatment nozzle (H), and the spray velocity (v) during plasma treatment were studied. The maximum bonding strength of plasma treatment was achieved at P=750 W, H=11 mm, and v=2 mm/s. The maximum bonding strength after laser texturing and plasma surface treatment was 6.58 MPa and 7.45 MPa, respectively. The bonding strength of untreated PA66 was 0.44 MPa. Laser texturing and plasma surface treatment both significantly improved the bonding strength of PA66. By utilizing the optimal parameters of laser texturing and plasma treatment for composite processing, the bonding strength increased to 8.67 MPa. Compared with that subject to laser texturing and plasma surface treatment, the bonding strength increased by 31.76% and 16.38%, respectively. 10 repeated experiments were conducted on different treatments to study their process stability. The standard deviation of the bonding strength under composite treatment was 0.371, so the composite treatment had higher process stability than plasma treatment. Laser texturing significantly changed the surface morphology of PA66 by forming groove structures on the surface. The groove structure on the surface greatly enhances the mechanical interlocking force between the material and the adhesive. Plasma treatment significantly alters the chemical composition of the PA66 surface, increasing the surface oxygen content from 2.92% to 28.47%. The oxygen groups on the surface form a strong chemical bonding force with the adhesive. After composite treatment, the surface contact angle decreases from 89.7° to 13.9°, enhancing the adsorption capacity. Under the comprehensive effect of mechanical interlocking, adsorption capacity, and chemical bonding, the bonding strength is significantly improved after laser texturing followed by plasma surface treatment. |
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