A silane pre-treatment for improving corrosion resistance performances of emeraldine base-coated aluminium samples in neutral environment

Cecchetto, Laura; Denoyelle, Alain; Delabouglise, Didier; Petit, Jean‐Pierre

doi:10.1016/j.apsusc.2007.07.128

Cited by 49 publications

(33 citation statements)

References 26 publications

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“…This fact, can be related with an increase of the geometric area of the AA2024, because the silane coating was formed on a rough surface (porous oxide-hydroxide) in comparison with a freshly polished surface of AA2024 for Ppy deposition. The case of polypyrrole on aluminium has been previously studied, showing that the best deposits are obtained on surfaces that present defects or imperfections on which the polymerisation process starts, growing along the entire substrate [7,30]. No prior studies have been done on silanes, and we believe that the need for a lower number of cycles for electrodeposition is a consequence of a higher number of active zones over which the polymerisation will start, generating their collapse in a shorter time.…”

Section: Al/al 2 O 3 /Silanes/ppy Layersmentioning

confidence: 93%

Organosilanes and polypyrrole as anticorrosive treatment of aluminium 2024

et al. 2009

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This paper addresses the preparation and characterisation of anticorrosive silane-and polypyrrole-based organic coatings and combinations of the two on aluminium 2024. Layer adsorption studies of organosilanes such as propyl (C3), octyl (C8) and octadecyl (C18) trimethoxysilane and polypyrrole deposits on the aluminium electrodes reveal only limited protection. Their anticorrosive power declines when they are subject to highly corrosive environments, such as salt fog cabinets, for extended periods. The combination of both deposits yields a more protective structure that affords better protection with time. The best performance is achieved with polypyrrole deposits on silanes due to the excellent bonding between the silane adsorbed on the surface of the material and the polypyrrole film. Of the three organosilanes used, the one with the shortest chain performs best. When long-chain organosilanes are used, the polypyrrole film becomes detached due to the lesser interaction between the layers. Electrochemical impedance spectroscopy and morphological studies of the layers also show the greater adhesion and lesser deterioration of polypyrrole deposits on silane layers.

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Section: Al/al 2 O 3 /Silanes/ppy Layersmentioning

confidence: 93%

Organosilanes and polypyrrole as anticorrosive treatment of aluminium 2024

et al. 2009

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“…Recently, as a kind of novel and innoxious green pre-treatments, organosilanes are used gradually to replace cromatilizing and parkerzing, which can improve binding performance between coating and the substrate greatly [4][5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Influence of acetic acid on dynamic behavior of hydrolazation and film forming of organosilane

Yang

Zhang

et al. 2009

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Abstracts: The influence of acetic acid on dynamic behavior of hydrolazation and film forming of an expoxy-silane compound (γ-GPS ) was investigated by conductivity meter, IR and AFM. The experimental results show that there is an optimal pH value(pH=4-5) for hydrolysis of silane solution, and with the prolongation of hydrolytic time, the promotion of acetic acid on the hydrolyzation of silane solution become more obvious. During the adsorption and film forming process, acetic acid could promote the formation of Si-O-Fe bond, which activates hydroxyl group of silanol unit and facilitates this hydroxyl group to react with adjacent silanol unit forming linear condensation polymers.

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“…These adhesion promoters contain various functional groups, including amino, epoxy, vinyl and alkyl groups. Bonding mechanisms of silanes to metal surfaces have been reported by different authors (Cecchetto et al, 2008;Hintze & Calle, 2006). A general mechanism can be described in the following stages: i) immersion of a metal into a dilute silane solution for few seconds; ii) spontaneous adsorption of the silanols groups (SiOH) on the surface through hydrogen bonds; iii) formation of covalent metallo-siloxane bonds from -SiOH groups and metal hydroxyls (HO Sub ).…”

Section: Pani Adhesion On Aluminium Surfacesmentioning

confidence: 99%

“…However, the authors also observed that organosilanes form SAMs with a large number of defects on AA2024-T3 alloy, which probably occur over copper enriched particles found on the alloy surface. Cecchetto et al (Cecchetto et al, 2008) used 3-aminopropyl-triethoxysilane (APS) as primer to promote the adhesion between the AA5182 alloy substrate and PAni (in emeraldine base) coating in order to improve the corrosion protection. Potentiodynamic studies using samples coated with APS and PAni showed a reduction in the corrosion current when compared with the bare surface.…”

Section: Pani Adhesion On Aluminium Surfacesmentioning

confidence: 99%