Boiling water and silane pre-treatment of aluminium alloys for durable adhesive bonding

A superhydrophobic surface was prepared by consecutive immersion in boiling water and sputtering of polytetrafluoroethylene (PTFE or Teflon®) on the surface of an aluminum alloy substrate. Immersion in boiling water was used to create a micro-nanostructure on the alloy substrate. Then, the rough surface was coated with RF-sputtered Teflon film.The immersion time in boiling water plays an important role on surface morphology and water repellency of the deposited Teflon coating. Scanning electron microscopy images showed a "flower-like" structure in first few minutes of immersion. And as the immersion time lengthened, a "corn-flake" structure appeared. FTIR analyses of Teflon-like coating deposited on water treated aluminum alloy surfaces showed fluorinated groups, which effectively reduce surface energy. The Teflon-like coating deposited on a rough surface achieved with five-minute immersion in boiling water, provided a high static contact angle (~164 º) and low contact angle hysteresis (~4 º).

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“…1c) [18][19]. Figure 1d shows the aluminum alloy covered by a RF-sputtered PTFE thin film after a 5-minute immersion in boiling water.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of superhydrophobic nanostructured surface on aluminum alloy

2010

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“…The critical fracture energy for mode I was measured The dimensions of the DCB specimens, not including the adhesive thickness, are in accordance with ASTM D3433 [15]. The thickness of the adherend (3.2 mm) was deemed to be sufficient for 2024 T3 aluminium alloy because its elastic limit was not exceeded when the same thickness was used with the FM300 adhesive for the Boeing wedge test according to ASTM D3762 [16,17]. The bonding surfaces of the DCB specimens were prepared via the same method used to prepare the bonded panels above.…”

Section: Double Cantilever Beam Testmentioning

confidence: 99%

Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach

Lee

Yeo

Blacklock

et al. 2015

International Journal of Adhesion and Adhesives

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“…The results of the contact angle measurement of aluminum immersed in boiling water shows that the surface has hydrophilic properties due to the presence of polar components [135,136]. Also, the porosity and morphology of the substrate are changed by different immersion times [25,114,137]. …”

Section: Iv-1-2-boiling Water Treatmentmentioning

confidence: 99%

Development of nano-structured icephobic surfaces based on plasma polymerization /

Mobarakeh¹

2014

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Accumulated ice on exposed surfaces leads to operational difficulties and extensive maintenance for power transmission lines, antennas, aircraft, ships, and ground transportation vehicles.In the present study, the low pressure plasma polymerized Hexamethyldisiloxane (PP-HMDSO) film is deposited on aluminum surfaces to create a superhydrophobic coating with icephobic properties. Prior to the deposition of this low surface energy coating, aluminum surfaces were anodized or immersed in boiling water to make micro/nano structured surfaces.Plasma parameters were optimized in order to find the best optimum conditions for having high static contact angle and low contact angle hysteresis. Hence, the Grey-based Taguchi method was used as one of the Design of Experiment (DOE) techniques. The stability of coatings was studied under accelerated aging conditions such as UV degradation, immersion in distilled water and different pH solutions, and several icing/deicing cycles. It was observed that the PP-HMDSO coatings are quite stable against UV exposure and immersion in distilled water. However, the icephobicity of the PP-HMDSO coating deposited on the anodized aluminum decreased after fifteen icing/de-icing cycles.The stability of the developed coating was improved against several icing/de-icing cycles by increasing the deposition time of plasma polymerized coating from 15 to 25 minutes. The results showed that increasing the deposition time of plasma polymerization leads to decrease of the ice adhesion strength of coatings on anodized aluminum while it has no significant effect on the PP-HMDSO coating deposited on a water-treated aluminum surface. Finally, the superhydrophobic PP-HMDSO coating also provides anti-corrosion protection for the aluminum substrate.

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Boiling water and silane pre-treatment of aluminium alloys for durable adhesive bonding

Cited by 151 publications

References 14 publications

Fabrication of superhydrophobic nanostructured surface on aluminum alloy

Fabrication of superhydrophobic nanostructured surface on aluminum alloy

Predicting the strength of adhesively bonded joints of variable thickness using a cohesive element approach

Development of nano-structured icephobic surfaces based on plasma polymerization /

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