Abstract
Phosphoric acid anodization (PAA) is a candidate for replacement of toxic chromates during the surface treatment of aluminum prior to gluing in the aerospace industry. During PAA, a layer of AlPO4 ...
Highlights
Adhesion is a phenomenon of great importance for applications in joining and coating, at least in the automotive and aerospace industries
One theory being that the adhesive force comes from interlocking created when the adhesive fills pores on the substrate before solidifying.[2−5] The other theory being that atomic scale interactions between the substrate and the coating/glue account for the adhesion.[6−10] Recent research indicates that both mechanisms contribute to adhesion.[11]
Hydrogen bonding between epoxy−resin hydroxyl groups and alumina was considered. It has been experimentally verified by Davis et al.[19] that the surface of Phosphoric acid anodization (PAA) aluminum consists of alumina covered by a layer of AlPO4
Summary
Adhesion is a phenomenon of great importance for applications in joining and coating, at least in the automotive and aerospace industries. Several computational studies of the α-quartz (0001) surface exist.[21−23] Rignanese et al.[21] explored several reorganizations for the α-quartz (0001) surface and found that the structure that they termed the dense model (Figure 5 in their paper) had the lowest energy. Bonding of this type of epoxy resin to hydroxylated γ-alumina surfaces has been studied at the DFT level of theory by Semoto et al.[18] They modeled epoxy resin as epoxy oligomers (Figure 1b) or a single molecule of 1,3-bis(phenoxy)propan-2-ol (BPP) (Figure 1c). Hydrogen bonding between epoxy−resin hydroxyl groups and alumina was considered It has been experimentally verified by Davis et al.[19] that the surface of PAA aluminum consists of alumina covered by a layer of AlPO4.
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