Rudawska Anna, Miturska-Barańska Izabela, Doluk Elżbieta, Olewnik-Kruszkowska Ewa
Faculty of Mechanical Engineering, Lublin University of Technology, Nadbystrzycka 36 St., 20-618 Lublin, Poland.
Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarin 7 St., 87-200 Toruń, Poland.
Materials (Basel). 2022 Jul 25;15(15):5158. doi: 10.3390/ma15155158.
The aim of the paper is to determine the influence of the surface treatment on the adhesive properties of steel sheet surfaces and the strength of the adhesive joints of steel sheets. The paper also aims to assess the degree of steel sheets' surface treatment in the bonding process. Due to the many methods of surface treatment and types of materials, the assessment of the surface treatment method is extremely important in adhesive processes. Two variants of the surface treatment were used: without a paint coating and with a paint coating, divided into two groups (without degreasing and with degreasing). Additionally, in the case of the analysis of the steel samples without the paint coating, mechanical treatment was applied. Two-component epoxy adhesive, prepared on the basis of bisphenol A and a polyamide curing agent, was used to prepare the single-lap adhesive joints of the steel sheets. The tests determined: (i) the adhesive properties of the steel sheets' surface based on the measurement of the contact angle of polar and apolar liquids (including wettability, work of adhesion, and surface free energy), (ii) surface roughness parameters (PN EN ISO 4287), and (iii) mechanical properties (load capacity and shear strength) of the steel sheets' adhesive joints (EN DIN 1465). Contact angle measurements of the steel sheet surfaces showed that the polar liquid better reflects the obtained strength results of the analyzed adhesive joints than the apolar liquid. Furthermore, better wettability of the surface of steel sheets with both polar and apolar liquids was obtained for samples whose surface was subjected to degreasing. It can also be concluded that the wettability of the surface can be used as one of the indicators of the degree of the surface treatment for the bonding process.
本文的目的是确定表面处理对钢板表面粘合性能以及钢板粘合接头强度的影响。本文还旨在评估钢板在粘合过程中的表面处理程度。由于表面处理方法和材料类型众多，在粘合过程中评估表面处理方法极为重要。使用了两种表面处理变体：无漆涂层和有漆涂层，有漆涂层又分为两组（无脱脂和有脱脂）。此外，在分析无漆涂层的钢样品时，进行了机械处理。基于双酚A和聚酰胺固化剂制备的双组分环氧胶粘剂用于制备钢板的单搭接粘合接头。测试确定了：(i)基于极性和非极性液体接触角的测量（包括润湿性、粘附功和表面自由能）来确定钢板表面的粘合性能，(ii)表面粗糙度参数（PN EN ISO 4287），以及(iii)钢板粘合接头的机械性能（承载能力和剪切强度）（EN DIN 1465）。钢板表面的接触角测量表明，极性液体比非极性液体能更好地反映所分析粘合接头的强度结果。此外，对于表面经过脱脂处理的样品，极性和非极性液体对钢板表面的润湿性都更好。还可以得出结论，表面润湿性可作为粘合过程中表面处理程度的指标之一。
