Steuernagel Leif, Schmidt Carsten, Jenensch Christian
Institute of Polymer Materials and Plastics Engineering, Clausthal University of Technology, Agricolastraße 6, 38678 Clausthal, Germany.
Institute of Production Engineering and Machine Tools, Leibniz Universität Hannover, Ottenbecker Damm 12, 21684 Stade, Germany.
Materials (Basel). 2025 Jun 26;18(13):3027. doi: 10.3390/ma18133027.
In the domain of agricultural machinery, the utilization of carbon fiber-reinforced plastics (CFRP) for structural components, such as the chassis, facilitates substantial weight reduction. To integrate additional components, stainless-steel connection points can be bonded to the CFRP chassis using adhesives. This study investigates surface preparation methods to enhance adhesive bonding strength at the coupon level. Three adhesives (DP490, MA8110, SG300) were tested on untreated, sandblasted, and sandpaper-grinded steel surfaces. Contrary to predictions, the highest strength (28.7 MPa) for DP490 was achieved after simple acetone cleaning, despite lower surface roughness (Ra = 1.60 µm), while sandblasting (Ra = 3.71 µm, 22 MPa) and grinding (Ra = 2.78 µm, 25.95 MPa) performed worse due to incomplete adhesive penetration. Subsequent tests on DP490 with laser structuring (Ra = 88.8 µm) and sandblasting with coating (Ra = 1.94 µm) provided strengths of 27.5 MPa and 29.3 MPa, respectively. The findings indicate that, under the examined conditions, surface cleanliness plays a more critical role in adhesive bonding strength than surface roughness. Practically, acetone cleaning is a cost-effective and time-efficient alternative to treatments like sandblasting or laser structuring. This makes it attractive for industrial use in agricultural machinery. While this study focuses on coupon-level surfaces, the findings provide a basis for scaling to component-level applications in future research.
在农业机械领域，将碳纤维增强塑料（CFRP）用于底盘等结构部件，可显著减轻重量。为集成更多部件，可使用粘合剂将不锈钢连接点粘结到CFRP底盘上。本研究在试样层面研究了提高粘结强度的表面处理方法。在未经处理、喷砂处理和砂纸打磨的钢表面测试了三种粘合剂（DP490、MA8110、SG300）。与预测相反，DP490在简单丙酮清洗后获得了最高强度（28.7MPa），尽管表面粗糙度较低（Ra = 1.60µm），而喷砂处理（Ra = 3.71µm，22MPa）和打磨处理（Ra = 2.78µm，25.95MPa）由于粘合剂渗透不完全而表现较差。随后对DP490进行激光结构化处理（Ra = 88.8µm）和喷砂并涂覆处理（Ra = 1.94µm），其强度分别为27.5MPa和29.3MPa。研究结果表明，在所研究的条件下，表面清洁度对粘结强度的影响比表面粗糙度更为关键。实际上，丙酮清洗是一种比喷砂或激光结构化处理更具成本效益和时间效率的替代方法。这使其在农业机械工业应用中具有吸引力。虽然本研究聚焦于试样层面的表面，但研究结果为未来研究扩大到部件层面的应用提供了基础。
