Pretreatment of Aluminium by Phosphoric Acid Anodizing Prior to Adhesive Bonding

Publisher Website
Google Scholar
Abstract
The advantages of phosphoric acid anodizing as pretreatment for durable adhesive bonding of aluminium alloys have been widely reported in US literature as a “quantum jump” in adhesive bonding. British Aerospace, Brough Materials Laboratory has investigated the process using traditional shear and peel tests, and also using the new and more controversial double cantilever beam or wedge test. The process can be used as an immersion process or locally in situ by use of a phosphoric acid gel electrolyte. Comparisons with current pretreatments on UK available adhesives support the American work under simulated accelerated environments of 50°C and 95% RH. There are a number of merits and disadvantages with the process, and these are briefly discussed.