Many types of adhesives are available in the market for bonding aluminum sheets. The selection of the adhesive will depend on the strength, durability and other performance requirements of the joint. I have annexed literature from a manufacturer of adhesives (Loctite Co.) and another document (from Sapa Group) that explains adhesive bonding for your reference, but I suggest that you do search the internet for "adhesive bonding of aluminium" in order to pick out suitable adhesives according to your needs.