Knust Steffen, Kuhlmann Andreas, Arcos Teresa de Los, Grundmeier Guido
Technical and Macromolecular Chemistry (TMC), Paderborn University Warburger Straße 100 33098 Paderborn Germany
RSC Adv. 2019 Oct 30;9(60):35077-35088. doi: 10.1039/c9ra07378g. eCollection 2019 Oct 28.
In this study, ZnMgAl alloy coated steel sheets were exposed to a dielectric-barrier discharge plasma with different gas mixtures (Ar, Ar + 5% O, Ar + 5% HO). Five different plasma-induced processes were identified at the surface: (i) etching of aliphatic carbon groups, (ii) conversion of absorbed carboxylates to carbonates, (iii) field-induced migration of Zn and Mg towards the surface, (iv) increased oxide layer thickness, and (v) homogenization of the surface potential of the originally very heterogeneous alloy. The relative contribution of each process depended on the specific gas mixture. Peel-test studies showed that all atmospheric-pressure plasma treatments improved the adhesive properties of the alloy coating for two different adhesives (acrylate and epoxy amine). The highest improvement was associated to the case of Ar + 5% HO gas mixture, where all described surface processes took place to a high degree.
在本研究中，将锌镁铝合金涂层钢板暴露于含有不同气体混合物（氩气、氩气+5%氧气、氩气+5%水蒸气）的介质阻挡放电等离子体中。在表面识别出了五种不同的等离子体诱导过程：（i）脂肪族碳基团的蚀刻，（ii）吸附的羧酸盐转化为碳酸盐，（iii）锌和镁向表面的场致迁移，（iv）氧化层厚度增加，以及（v）原本非常不均匀的合金表面电位的均匀化。每个过程的相对贡献取决于特定的气体混合物。剥离试验研究表明，所有大气压等离子体处理均改善了合金涂层对两种不同粘合剂（丙烯酸酯和环氧胺）的粘附性能。最大的改善与氩气+5%水蒸气气体混合物的情况相关，在这种情况下，所有上述表面过程都高度发生。
