Monitoring laser cleaning for enhanced adhesion of FIPG silicone adhesive in automotive industry

IF 3.5 3区材料科学 Q2 ENGINEERING, CHEMICAL International Journal of Adhesion and Adhesives Pub Date : 2025-03-01 Epub Date: 2025-01-04 DOI:10.1016/j.ijadhadh.2025.103938

Moritz Wahl , Patrik Doraciak , Lea Römling , Thomas Scheffler , Thomas Lampke , Frank Henning

{"title":"Monitoring laser cleaning for enhanced adhesion of FIPG silicone adhesive in automotive industry","authors":"Moritz Wahl , Patrik Doraciak , Lea Römling , Thomas Scheffler , Thomas Lampke , Frank Henning","doi":"10.1016/j.ijadhadh.2025.103938","DOIUrl":null,"url":null,"abstract":"<div><div>Adhesive bonding and sealing of safety-relevant bonding joints in the automotive industry requires automatable monitoring of cleaning processes to reproducibly ensure clean adherend surfaces and finally sufficient adhesion. The industry lacks combined experimental data that include the cleaning of precisely contaminated surfaces, the monitoring thereof and the subsequent adhesive bonding to design these production processes holistically. Therefore, this study investigates laser-induced fluorescence (LIF) and laser-induced breakdown spectroscopy (LIBS) as inline-capable monitoring methods for laser cleaning of aluminium specimens contaminated with cooling lubricant by varying the contamination grammage and the laser cleaning power density. The results of the methods are validated with measurements using a Fourier transform infrared spectroscopy with an attenuated total reflectance unit (FTIR-ATR). Additionally, the adhesion properties of a model room temperature vulcanised (RTV) silicone adhesive are evaluated using lap shear tests. This adhesive is characteristically used as a formed-in-place gasket (FIPG) for sealing applications.</div><div>The results show a complete and consistent picture of the interaction of all applied analytical methods. LIF, LIBS and FTIR-ATR are able to detect contaminations between 0.15 and 2.0 g m<sup>−2</sup>. Subsequently, they determine a laser power density onset threshold for laser cleaning of a 2.0 g m<sup>−2</sup> contaminated specimen, which was verified in lap shear analysis. The fracture patterns show decreasing cohesive failure with increasing contamination grammage, which increases after laser cleaning with a laser power density above the determined threshold.</div></div>","PeriodicalId":13732,"journal":{"name":"International Journal of Adhesion and Adhesives","volume":"138 ","pages":"Article 103938"},"PeriodicalIF":3.5000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Adhesion and Adhesives","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0143749625000053","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/4 0:00:00","PubModel":"Epub","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Adhesive bonding and sealing of safety-relevant bonding joints in the automotive industry requires automatable monitoring of cleaning processes to reproducibly ensure clean adherend surfaces and finally sufficient adhesion. The industry lacks combined experimental data that include the cleaning of precisely contaminated surfaces, the monitoring thereof and the subsequent adhesive bonding to design these production processes holistically. Therefore, this study investigates laser-induced fluorescence (LIF) and laser-induced breakdown spectroscopy (LIBS) as inline-capable monitoring methods for laser cleaning of aluminium specimens contaminated with cooling lubricant by varying the contamination grammage and the laser cleaning power density. The results of the methods are validated with measurements using a Fourier transform infrared spectroscopy with an attenuated total reflectance unit (FTIR-ATR). Additionally, the adhesion properties of a model room temperature vulcanised (RTV) silicone adhesive are evaluated using lap shear tests. This adhesive is characteristically used as a formed-in-place gasket (FIPG) for sealing applications.

The results show a complete and consistent picture of the interaction of all applied analytical methods. LIF, LIBS and FTIR-ATR are able to detect contaminations between 0.15 and 2.0 g m⁻². Subsequently, they determine a laser power density onset threshold for laser cleaning of a 2.0 g m⁻² contaminated specimen, which was verified in lap shear analysis. The fracture patterns show decreasing cohesive failure with increasing contamination grammage, which increases after laser cleaning with a laser power density above the determined threshold.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

监测激光清洗提高汽车工业中FIPG硅酮胶的附着力

汽车工业中与安全相关的粘接接头的粘接和密封需要对清洁过程进行自动化监控，以确保粘接表面的清洁，并最终确保足够的附着力。该行业缺乏综合实验数据，包括对污染表面的精确清洁、监测以及随后的粘合剂粘合，以整体设计这些生产过程。因此，本研究研究了激光诱导荧光（LIF）和激光诱导击穿光谱（LIBS）作为在线监测方法，通过改变污染克重和激光清洗功率密度，对被冷却润滑剂污染的铝试样进行激光清洗。用带衰减全反射单元（FTIR-ATR）的傅里叶变换红外光谱测量验证了方法的结果。此外，使用搭接剪切试验评估了模型室温硫化（RTV）硅酮粘合剂的粘附性能。这种粘合剂的特点是用作密封应用的成形垫片（FIPG）。结果显示了所有应用分析方法的相互作用的完整和一致的画面。LIF， LIBS和FTIR-ATR能够检测0.15和2.0 g m−2之间的污染物。随后，他们确定了激光清洗2.0 g m−2污染样品的激光功率密度起始阈值，并在lap剪切分析中进行了验证。随着污染克重的增加，黏结破坏逐渐减少，当激光功率密度超过一定阈值时，黏结破坏增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

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.