BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...
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Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 115<br />
The strength of the bonding depends of the adhesive and of the surfaces. In<br />
a group of experiments where the aluminium alloy 6063 with a tensile strength<br />
of 100 MPa was used the strength of the bonding on plate of 20 mm and the<br />
bonding area of 20 x 20 mm 2 have for anodized unsealed aluminium been<br />
measured to app. 7400 N with DP460 and to 3700 N for the flexible Sikaflex -<br />
360HC. The strength of bonding with DP460 (epoxy resin) can be up to 10000<br />
N on the area 20x20 mm 2 .<br />
8. Conclusions<br />
It is possible to bond aluminium with an adhesive and obtain a good<br />
strength and flexibility. The adhesive bonding is best for a shear stress and<br />
sensitive for especially a peeling. The adhesive used will always be a structural<br />
adhesive. Epoxy adhesives, polyurethane adhesives and acrylics adhesives are<br />
the most common used adhesives for aluminium.<br />
For obtaining a good bonding the surface of the aluminium needs to be<br />
wetted by the adhesive. If a surface shall be wetted by an adhesive the surface<br />
tension of the surface need to be higher than the surface tension of the adhesive.<br />
For estimating the possibility of wetting of the surface with an adhesive the<br />
HSP can be used as a tool.<br />
Adhesive bonding give a better strength for anodized aluminium if the<br />
bonding is made on unsealed anodized aluminium. The unsealed anodized<br />
aluminium is porous and will give a better mechanical interlocking together<br />
with a physical adsorption in the interphase between the anodized layer and the<br />
adhesive. Use of an adhesive as a primer can increase the strength in the<br />
interphase. If it is possible a primer or an adhesive, which can give a chemical<br />
reaction between the unsealed anodized aluminium, shall be used for obtaining<br />
the highest strength of the bonding.<br />
Received:January, 30,l 2010 Aalborg University,<br />
Esbjerg Institute of Technology<br />
Esbjerg, Denmark<br />
e-mail: bks@bio.aau.dk<br />
R E F E R E N C E S<br />
1. H a n s e n Ch. M., Handbook of Solubility Parameters – A User´s Handbook, CRC<br />
Press, 1 st edition, 2000.<br />
2. O e r t e l G., Polyurethane Handbook, Hanser Publishers, 2 nd edition, 1994.<br />
3. P e t r i e E. D., Handbook of adhesives and sealants, McGraw-Hill, 2000.
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