使用开口试样的粘接接头水热降解行为

IF 3.2 3区 材料科学 Q2 ENGINEERING, CHEMICAL International Journal of Adhesion and Adhesives Pub Date : 2024-07-27 DOI:10.1016/j.ijadhadh.2024.103785
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引用次数: 0

摘要

众所周知,湿气进入粘合剂接缝会降低粘合强度。湿气导致的强度降低主要有两个原因。首先是粘合剂层的降解,其进展相对缓慢。其次是粘合剂与被粘物之间的界面强度降低,这一点较难预测。界面强度的降解行为因粘合剂类型而异。因此,我们研究了水渗入对使用单组分环氧树脂粘合剂粘合的三个开口钢和镁合金试样的影响。开口试样的一侧没有粘合剂,水从开口一侧高速渗入。这种试样更快达到饱和吸水状态,因此可以快速确认吸水后的降解情况。为了缩短试验时间,试样在 87 °C 的热水中进行了检验。最初,钢试样粘合层发生内聚破坏,强度随时间而降低。长时间浸泡导致逐渐腐蚀,腐蚀层内的裂缝开始混合。对于镁合金板,在热水中浸泡会导致粘合立即失效,同时粘合强度显著降低。当使用闭面试样(即普通试样)而不是开口试样时,可以观察到从边缘浸泡到粘附失效的顺序过渡。
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Hydrothermal degradation behaviour of bonded joints using open-faced specimens

Moisture ingress into adhesive joints is known to reduce bond strength. The strength loss due to moisture is attributed to two primary causes. The first is the degradation of the adhesive layer, which progresses relatively slowly. The second is the reduction in the interfacial strength between the adhesive and the adherend, which is more difficult to predict. The degradation behaviour of interfacial strength varies depending on the adherend type. Therefore, the effect of water penetration on three open-faced steel and magnesium alloy specimens bonded with one-component epoxy adhesives was investigated. The open-faced specimen had no adherend on one side, and water penetrated at a high speed from the open side. The saturated water absorption state was reached faster in this specimen, which allowed the rapid confirmation of degradation after water absorption. To reduce test time, the specimens were examined in hot water at 87 °C. Initially, cohesive failure in adhesive layers occurred for the steel specimens and the strength decreased with time. Prolonged immersion resulted in progressive corrosion, and the fractures within the corrosion layer began to mix. For magnesium alloy plates, immersion in hot water caused immediate adhesion failure and, simultaneously, a significant reduction in the adhesion strength. When closed-faced specimens (i.e. normal specimens) were used instead of open-faced specimens, a sequential transition was observed from cohesion to adhesion failure with immersion from the edge.

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来源期刊
International Journal of Adhesion and Adhesives
International Journal of Adhesion and Adhesives 工程技术-材料科学:综合
CiteScore
6.90
自引率
8.80%
发文量
200
审稿时长
8.3 months
期刊介绍: The International Journal of Adhesion and Adhesives draws together the many aspects of the science and technology of adhesive materials, from fundamental research and development work to industrial applications. Subject areas covered include: interfacial interactions, surface chemistry, methods of testing, accumulation of test data on physical and mechanical properties, environmental effects, new adhesive materials, sealants, design of bonded joints, and manufacturing technology.
期刊最新文献
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