Effect of bath concentration and curing time on the structure of non-functional thin organosilane layers on aluminium

Franquet, Alexis; Pen, Christophe Le; Terryn, Herman; Vereecken, Jean

doi:10.1016/s0013-4686(02)00832-0

Cited by 160 publications

(93 citation statements)

References 23 publications

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“…In the case of silica-organic coatings, as the concentration of the silicate solution increases, their protective properties deteriorate due to high porosity. An improvement in their protective properties can be achieved through additional curing [103] or by applying a subcoating which by forming Si-O-M (M-a metal constituent of the substrate) bonds perfectly adheres to the substrate surface [104]. Curing is used to induce better cross-linking of the layer.…”

Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

Self-healing coatings in anti-corrosion applications

2013

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Nonmetallic (based on polymers or oxides) and metallic protective coatings are used to protect metal products against the harmful action of the corrosion environment. In recent years, self-healing coatings have been the subject of increasing interest. The ability of such coatings to self-repair local damage caused by external factors is a major factor contributing to their attractiveness. Polymer layers, silica-organic layers, conversion layers, metallic layers and ceramic layers, to mention but a few, are used as self-healing coatings. This paper presents the main kinds of self-healing coatings and explains their selfhealing mechanisms.

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Section: Hybrid Oxide Coatingsmentioning

confidence: 99%

Self-healing coatings in anti-corrosion applications

2013

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“…More specifically, inorganic conversion coatings based on permanganate treatment and organosilanebased layers were prepared and applied to the surface of Al alloys. It would be useful to mention here that organosilane coupling agents followed by a self-assembled monolayer (SAM) coating process seem to be an interesting alternative system for replacing the toxic chromâtes, namely the bis-1, 2-(triethoxysilyl) ethane (BTSE) thin layers [19]. Curing of the silane layer has the potential for improving the barrier properties of the film.…”

Section: Preparation Of Anticorrosive Coatings On Aa Substratesmentioning

confidence: 99%

“…These conditions offer the best compromise between silane hydrolysis and condensation, leading to improved stability of the solution [19]. Polished and cleaned flat Al panels were dipped into the BTSE solution for different immersion times [166,167] followed by blow-drying in an N2 gas flow.…”

Section: ) L2-bis(triethoxysilyl)ethane (Btse) Chemical Bath Deposimentioning

confidence: 99%

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Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Farhadi¹

2010

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Ice and wet-snow accretion on outdoor structures, including power transmission and distribution equipment, is a serious problem for regions experiencing icing conditions.Various de-icing and anti-icing techniques have been developed to date to counter this problem. Most of the techniques currently in use, however, including active de-icing methods, are employed only where accumulations are substantial. Passive approaches to the problem such as anti-icing or icephobic coatings which inhibit or retard ice accumulation on the surfaces are gaining in popularity.Metal corrosion should also be taken into account since metal or metallic alloys are subject to corrosion problems when placed in a humid or aggressive environment; the development of any ice-releasing coatings on Al structures, as they must be durable enough, is thus closely related to anti-corrosive protection of that specific metal.Consequently, this research has made an attempt to prepare coatings, either one layer or multi-layer, for use on polished AA6061 and AA2024 substrates combining the qualities of reduced ice adhesion and improved corrosion resistance. These two alloys are among the most widely used aluminium alloys in transportation systems (including aircraft), electric power industry, military, etc. Both the stability of the coatings in a humid environment and their overall ice-repellent performance was systematically studied.This research work has made a systematic approach to investigating the influence of surface roughness on the ice-releasing potential and the hydrophobic properties of the prepared coating surfaces. All coatings displayed a gradual loss of their hydrophobic properties after ~ 1000 h of immersion in water, and while corrosion of surfaces was also observed, except in the case of surfaces treated with permanganate conversion coatings which provided satisfactory anti-corrosive protection. IllAll flat coated surfaces demonstrated shear stress of ice detachment values which were at least ~ 1.5 times lower than uncoated mirror-polished Al surfaces and about ~ 2 times lower than those observed on as-received Al surfaces. The adhesion reduction factor (ARF) values decreased after as many as 12 icing/de-icing events, implying a certain amount of decay of the coatings.All rough superhydrophobic samples allowed for ice adhesion shear stress values of at least ~ 4 to 7 times lower than those obtained on the uncoated as-received Al surfaces. After 24 icing/de-icing experiments, however, ice adhesion strength increased significantly on those surfaces by a factor of ~ 2 after 24 icing/de-icing cycles.In addition, all flat and rough-coated surfaces gradually lost their hydrophobic properties after nearly each icing/de-icing cycle. Thus, the ice-releasing ability of all samples tested was found to be time-dependent.The work thus reveals that it is possible to prepare coatings which provide the reduced adhesion of ice to Al surfaces, while at the same time also providing some degree of anticorrosive protection.

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“…Franquet et al [45,53] afirmam que o processo de cura contribui para a boa reticulação da camada de silano e consequente potencialização do efeito barreira, além de diminuir lentamente a espessura do filme por torná-lo mais denso e compacto. Dessa forma, os filmes após o processo de cura proporcionam uma melhor proteção contra a corrosão.…”

Section: Cura Dos Filmes De Polissiloxanounclassified

Avaliação do desempenho de pré-tratamentos à base de bissilanos sobre aço carbono e aço galvanizado utilizados na indústria automotiva.

Souza¹

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Effect of bath concentration and curing time on the structure of non-functional thin organosilane layers on aluminium

Cited by 160 publications

References 23 publications

Self-healing coatings in anti-corrosion applications

Self-healing coatings in anti-corrosion applications

Preventing corrosion and ice accretion on aluminium surfaces applying organic and inorganic thin films /

Avaliação do desempenho de pré-tratamentos à base de bissilanos sobre aço carbono e aço galvanizado utilizados na indústria automotiva.

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