Abstract
Abstract The durabilities of three pretreatments developed for the structural adhesive bonding of titanium alloys are being investigated. These are alkaline hydrogen peroxide etch (AHP), sodium hydroxide anodise (SHA) and catalytic alkaline hydrogen peroxide etch (CAHP). Natural weathering in several climates and accelerated laboratory aging are being carried out. The AHP etch has proved very durable. To date SHA and CAHP treatments are as good. Comparison of quality control and durability data suggests that wedge test crack growth data may not be suitable for these pretreatments. The use of the accelerated weathering data for predicting natural weathering is discussed.
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