Wang Wanru, Wang Zhen, Guo Rui, Xian Guijun
Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China.
Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China.
Polymers (Basel). 2022 Aug 23;14(17):3438. doi: 10.3390/polym14173438.
Traditional steel surface treatment (e.g., sand blasting, or silane treatment) was regarded as an effective method to improve the bonding strength of steel-epoxy single-lap joints. In the present study, a new steel surface treatment method was developed. With this method, the steel surfaces were treated with suspensions of nano-sized and micro-sized AlO particles in ethanol/water mixture using the dip-coating method. Both AlO particle sizes were previously treated or not treated with silane. Single-lap shear tests of the steel-epoxy bonds were conducted to compare the effects of the treating methods. According to the testing results, the highest increase in the bonding strength (by 51.8%) was found for the steel coated with the suspension of silane treated nano-AlO particles. Scanning electron microscopy (SEM) analysis and energy dispersive spectrometer (EDS) analysis indicates that the nano-AlO particles were clearly attached to the treated steel surfaces. Moreover, the steel surface with the silane-treated nano-AlO particles was found to clearly enhance the contact angle between the steel and epoxy resin. The fracture morphology analysis of the single-lap shear testing specimen shows that the bonding between the steel and adhesive changed from steel-epoxy interfacial failure to cohesive failure when the steel surfaces were treated with the nano-AlO particles suspension. The developed steel surface treatment method with the suspension of nano-particles proves to be effective and reliable in enhancing the bonding strength of the steel-to-epoxy adhesives.
传统的钢表面处理方法（如喷砂或硅烷处理）被认为是提高钢-环氧单搭接接头粘结强度的有效方法。在本研究中，开发了一种新的钢表面处理方法。采用这种方法，使用浸涂法用乙醇/水混合物中的纳米级和微米级AlO颗粒悬浮液对钢表面进行处理。两种AlO颗粒尺寸均预先用硅烷处理或未处理。对钢-环氧粘结进行单搭接剪切试验，以比较处理方法的效果。根据测试结果，发现用硅烷处理的纳米AlO颗粒悬浮液涂覆的钢的粘结强度提高幅度最大（提高了51.8%）。扫描电子显微镜（SEM）分析和能量色散光谱仪（EDS）分析表明，纳米AlO颗粒明显附着在处理过的钢表面。此外，发现用硅烷处理的纳米AlO颗粒的钢表面明显提高了钢与环氧树脂之间的接触角。单搭接剪切试验样品的断口形貌分析表明，当用纳米AlO颗粒悬浮液处理钢表面时，钢与胶粘剂之间的粘结从钢-环氧界面破坏转变为内聚破坏。所开发的用纳米颗粒悬浮液进行钢表面处理的方法在提高钢与环氧胶粘剂的粘结强度方面被证明是有效且可靠的。
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