Journal
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Volume 20, Issue 3, Pages 209-220Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0143-7496(99)00046-9
Keywords
aluminium and alloys; surface treatment by chemical solutions; X-ray photoelectron spectroscopy; wedge tests
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Three series of aluminium alloys received a surface pre-treatment including immersion in boiling water followed by soaking in a 1% aqueous solution of 3-glycidoxytrimethoxysilane. When aluminium was pre-treated in this manner, adhesive joints formed with a range of epoxy resins produced notable improvements in bond durability in comparison with simple abrasion pre-treatments. In some cases, the pre-treatment improved joint durability to the level observed for the phosphoric acid anodise process. The development of a platelet structure in the outer film region combined with the hydrolytic stability of adhesive bonds made to the epoxy silane appear to be critical in developing the bond durability observed. Generally, immersion of the aluminium alloys at temperatures above 80 degrees C for periods between 4 and 60 min provide the optimum conditions required to prepare a surface film, which will produce durable bonds with epoxy adhesive. Crown copyright (C) 2000 Published by Elsevier Science Ltd. All rights reserved.
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