Some aspects of chemistry in adhesion on anodized aluminium

Kollek, H.

doi:10.1016/0143-7496(85)90019-3

Cited by 53 publications

(7 citation statements)

References 5 publications

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“…With its siblings: the double cantilever beam (DCB), and the tapered double cantilever beam (TDCB), a force is applied, essentially in cleavage, to provoke substrate separation perpendicularly to the bondline (e.g., [1][2][3][4][5][6][7][8][9][10][11]). Analysis of geometry, materials properties 132 M. Budzik et al / J. Adhes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adhesive Compliance in the Assessment of Soft Adhesives with the Wedge Test

Budzik¹,

Jumel

Imielińska

et al. 2011

Journal of Adhesion Science and Technology

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Wedge tests are usually analysed assuming that the free, unbonded members may be treated as encastré cantilever beams. However, if the adhesive layer is sufficiently flexible (e.g., due to low elastic modulus), then significant strain in the bonded region may occur and lead to modification of the behaviour outside this region. Using in conjunction a sensitive strain gauge method on asymmetric wedge tests and a mathematical analysis developed from the work of Winkler, we conclude that the standard, simple beam theory approach significantly overestimates crack length for a supple adhesive layer. The present contribution mainly considers strain effects in the intact, bonded zone, rather than fracture per se. However, it is concluded that, if in fracture tests, the incorrect values of crack length obtained from the encastré beam assumption are employed to calculate fracture energy using the simpler model, there will be some self-compensation and little error in estimates of the latter will result (at least in the cases presently studied).

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Section: Introductionmentioning

confidence: 99%

Effect of Adhesive Compliance in the Assessment of Soft Adhesives with the Wedge Test

Budzik¹,

Jumel

Imielińska

et al. 2011

Journal of Adhesion Science and Technology

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“…Resin with P:F ratio of 1:2.9 shows high shear values compared to resin with higher P=F ratios. Phenolic resin possesses exceptional adhesive properties on metal surfaces and can form a [15] . Figure 3 shows the variation of shear strength (Al-Al) with resin content for resin containing different CNSL:P ratios.…”

Section: Effect Of Sulfurmentioning

confidence: 99%

Studies on Metal-to-Metal Adhesives Based on CNSL Resins

Lubi

Thachil

2006

Polymer-Plastics Technology and Engineering

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In this study the adhesive properties of a blend of polychloroprene rubber and a resin derived from cashew nut shell liquid (CNSL) are investigated. The resin is a copolymer obtained by condensing a mixture of CNSL and phenol with hexamethylene tetramine. The effects of varying the stochiometric ratios between total phenol and formaldehyde, CNSL and phenol, resin content, choice and extent of fillers, and adhesion promoters in the adhesive formulation were studied. The results show that CNSL-based resin is an effective ingredient in adhesives for bonding aluminium to aluminium. This is significant from the viewpoint of conservation because CNSL is a renewable resource and a cheap agricultural by-product.

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“…6 Reviewing the literature to date, the high strength of these bonded structures is attributed to the accumulated effect of two main mechanisms: (1) mechanical interlocking and (2) chemical interactions and physical interactions between the oxide and the organic resin. [7][8][9] However, their extent and role remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Interface strength and degradation of adhesively bonded porous aluminum oxides

Abrahami

Kok²,

Gudla

et al. 2017

npj Mater Degrad

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For more than six decades, chromic acid anodizing has been the main step in the surface treatment of aluminum for adhesively bonded aircraft structures. Soon this process, known for producing a readily adherent oxide with an excellent corrosion resistance, will be banned by strict international environmental and health regulations. Replacing this traditional process in a high-demanding and high-risk industry such as aircraft construction requires an in-depth understanding of the underlying adhesion and degradation mechanisms at the oxide/resin interface resulting from alternative processes. The relationship between the anodizing conditions in sulfuric and mixtures of sulfuric and phosphoric acid electrolytes and the formation and durability of bonding under various environmental conditions was investigated. Scanning electron microscopy was used to characterize the oxide features. Selected specimens were studied with transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy to measure resin concentration within structurally different porous anodic oxide layers as a function of depth. Results show that there are two critical morphological aspects for strong and durable bonding. First, a minimum pore size is pivotal for the formation of a stable interface, as reflected by the initial peel strengths. Second, the increased surface roughness of the oxide/resin interface caused by extended chemical dissolution at higher temperature and higher phosphoric acid concentration is crucial to assure bond durability under water ingress. There is, however, an upper limit to the beneficial amount of anodic dissolution above which bonds are prone for corrosive degradation. Morphology is, however, not the only prerequisite for good bonding and bond performance also depends on the oxides' chemical composition.

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Some aspects of chemistry in adhesion on anodized aluminium

Cited by 53 publications

References 5 publications

Effect of Adhesive Compliance in the Assessment of Soft Adhesives with the Wedge Test

Effect of Adhesive Compliance in the Assessment of Soft Adhesives with the Wedge Test

Studies on Metal-to-Metal Adhesives Based on CNSL Resins

Interface strength and degradation of adhesively bonded porous aluminum oxides

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