Study of the effect of different aluminium surface pretreatments on the deposition of thin non‐functional silane coatings

Abstract

This paper focuses on the effect of aluminium surface pretreatment on the formation of thin non-functional silane films. Three pretreatments were used to prepare the aluminium surface before the deposition of silane films. The generated surfaces were characterized before and after the silane film deposition by infrared spectroscopic ellipsometry (IRSE) and by the combination of SEM, AES and spectroscopic ellipsometry (SE), respectively. It is demonstrated that the amounts of hydroxyl groups at the aluminium surface provided by the different pretreatments strongly influence the initiation and the formation of the silane films.

Optimisation of wet chemical silane deposition to improve the interfacial strength of stainless steel/epoxy

“…The solution pH affects the molecular orientation after deposition [16,21,24]. The silane concentration is often kept low to suppress self-condensation and limit the siloxane layer thickness after deposition [16,18,19,25]. Literature generally reports that the final film thickness (linearly) increases with the solution concentration, while the uniformity decreases [25][26][27].…”

“…The silane concentration is often kept low to suppress self-condensation and limit the siloxane layer thickness after deposition [16,18,19,25]. Literature generally reports that the final film thickness (linearly) increases with the solution concentration, while the uniformity decreases [25][26][27]. As a result the interfacial strength often decreases when higher silane concentrations are used [19].…”

Effect of the surface chemical treatment on the properties of a sol–gel film on AA1050

“…This peak was assigned to the Al-O stretching of the aluminium oxide. [28] Sample Al-AAA shows a remarkably higher number of Al-A Figure 1. Fourier transform infrared spectra of the uncoated samples.…”

Adhesive Bonding and Corrosion Performance Investigated as a Function of Aluminum Oxide Chemistry and Adhesives

“…Since silanes react with metals via their OH groups, maximizing the amount of these groups at the oxide surface is desired. In a study by Franquet et al 35 , it was shown that a pre-treatment increasing the amount of surface hydroxyls will in turn result in silane films of better uniformity and larger thickness.…”