Conformal coatings with higher adhesion strength is crucial for mitigating the growth of whiskers from the pure tin (Sn) or Sn-rich surfaces of the Pb-free electronics. Silane coupling agents have the ability to form a durable bond between polymeric coatings and metallic materials. The main goal of this paper is to investigate the effect of silane agents on the adhesion behavior of polyurethane (PU), polyurethane acrylate (PUA) and both coatings filled with silicone rubber (SR) nanoparticles on the tin solder pads. It was found that an isocyanate-based silane provided excellent adhesion for PU and PU + SR coatings and an acrylic-based silane for PUA and PUA + SR coatings on the tin surface. This was due to the reaction bond formation between the silane coupling agent and the coating. Hence, the selection of silane coupling agents with the organofunctional group similar to the coating material is crucial to improve the adhesion properties of the coating.

具有更高粘附强度的保形涂层对于减缓无铅电子器件的纯锡 (Sn) 或富锡表面的晶须生长至关重要。硅烷偶联剂能够在聚合物涂层和金属材料之间形成持久的结合。本文的主要目的是研究硅烷试剂对聚氨酯 (PU)、聚氨酯丙烯酸酯 (PUA) 和两种填充有硅橡胶 (SR) 纳米颗粒的涂层在锡焊盘上的粘附行为的影响。结果表明，异氰酸酯基硅烷为 PU 和 PU + SR 涂层提供了优异的附着力，而丙烯酸基硅烷为锡表面上的 PUA 和 PUA + SR 涂层提供了优异的附着力。这是由于硅烷偶联剂和涂层之间形成了反应键。因此，