Abstract
Practical constraints may restrict the method of surface pretreatment of aluminium alloy surfaces prior to bonding, and a need then arises for simpler techniques than those normally carried out, without a significant decrease in long term environmental durability of the bonded components. It is shown that use of the conventional sodium dichromate/sulphuric acid etching process at room temperature for a longer time, rather than at the specified 60–65°C, can produce equally durable joints and, with the particular alloy composition investigated, appears to show an improvement. Two cold curing modified epoxy adhesives were used to compare the performance of the hot and cold etching processes, respectively, and some limited testing was also carried out with several hot curing adhesives. Joint durability was assessed by water immersion of lap shear specimens and by wedge testing.
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