Abstract In this study, different primer formulations were used for enhancing the adhesion between a high consistency methyl phenyl vinyl silicone rubber (HCR) and AA6061 aluminum alloy. These formulations were selected on the basis of their different chemical composition. One contains only silanes and a titanate catalyst, a second contains only reactive macromolecular polysiloxane chains and a third contains both silanes and reactive macromolecular polysiloxane chains as the main components. The effect of the metal surface topography on the efficiency of the primers was investigated. The condensation reactions in the primers were followed by Fourier Transform Infrared Reflexion Absorption (FTIR-RA) spectroscopy and rheological measurements. 90° peel test was used to measure the adhesive strength of the silicone on metal and the fracture surfaces after peeling were analysed using SEM-EDS to determine the loci of failure. Cure monitoring of the silane based formulations showed that hydrolysis/condensation of silanes occur rapidly after their application on AA6061 surfaces and lead to a high degree of crosslinking even in the formulations with PDMS additives. The heat cure of the formulation based on a one-component addition curing system (SiH oligomer, vinylated-PDMS with a platinum catalyst) resulted in a film with a high cohesive strength. The primer formulation containing silanes and reactive PDMSs as the main components resulted in the best adhesion of the silicone elastomer with a dominant cohesive failure. However, a weaker adhesion was obtained at a high roughness of the substrate due to a weak adhesive strength at the metal/primer interface. A pretreatment composed of a first layer of activated silanes and a second layer of reactive silicone chains gave a good adhesion both at low and high roughness of the aluminum substrate. Roughening of the metal surface did not improve the adhesion of silicone elastomers on the primed metals in any of the studied treatments, indicating that mechanical interlocking and increase in contact area do not contribute to adhesion. The results were discussed based on the different chemical composition and rheological properties of the primer formulations.

中文翻译：

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表面形貌对有机硅弹性体对AA6061铝合金附着力的影响

摘要 在这项研究中，使用不同的底漆配方来增强高稠度甲基苯基乙烯基硅橡胶 (HCR) 与 AA6061 铝合金之间的附着力。这些配方是根据它们不同的化学成分选择的。一种仅含有硅烷和钛酸酯催化剂，第二种仅含有反应性高分子聚硅氧烷链，第三种含有硅烷和反应性高分子聚硅氧烷链作为主要成分。研究了金属表面形貌对底漆效率的影响。引物中的缩合反应随后进行傅立叶变换红外反射吸收 (FTIR-RA) 光谱和流变测量。90°剥离试验用于测量有机硅在金属上的粘合强度，剥离后的断裂表面使用SEM-EDS分析以确定失效位置。硅烷基配方的固化监测表明，硅烷在应用于 AA6061 表面后会迅速发生水解/缩合，即使在含有 PDMS 添加剂的配方中也会导致高度交联。基于单组分加成固化系统（SiH 低聚物、乙烯基化-PDMS 和铂催化剂）的配方热固化产生具有高内聚强度的薄膜。包含硅烷和反应性 PDMS 作为主要成分的底漆配方导致有机硅弹性体的最佳附着力，但主要是内聚失效。然而，由于金属/底漆界面处的粘合强度较弱，因此在基材的高粗糙度下获得较弱的粘合力。由第一层活化硅烷和第二层反应性有机硅链组成的预处理在铝基材的低粗糙度和高粗糙度下均具有良好的附着力。在任何研究的处理中，金属表面的粗糙化都没有提高有机硅弹性体在底漆金属上的附着力，表明机械互锁和接触面积的增加对附着力没有贡献。根据底漆配方的不同化学成分和流变特性对结果进行了讨论。由第一层活化硅烷和第二层反应性有机硅链组成的预处理在铝基材的低粗糙度和高粗糙度下均具有良好的附着力。在任何研究的处理中，金属表面的粗糙化都没有提高有机硅弹性体在底漆金属上的附着力，表明机械互锁和接触面积的增加对附着力没有贡献。根据底漆配方的不同化学成分和流变特性对结果进行了讨论。由第一层活化硅烷和第二层反应性有机硅链组成的预处理在铝基材的低粗糙度和高粗糙度下均具有良好的附着力。在任何研究的处理中，金属表面的粗糙化都没有提高有机硅弹性体在底漆金属上的附着力，表明机械互锁和接触面积的增加对附着力没有贡献。根据底漆配方的不同化学成分和流变特性对结果进行了讨论。表明机械互锁和接触面积的增加对粘附没有贡献。根据底漆配方的不同化学成分和流变特性对结果进行了讨论。表明机械互锁和接触面积的增加对粘附没有贡献。根据底漆配方的不同化学成分和流变特性对结果进行了讨论。