Laminate including aluminum sheets

A method of making a laminate structure, the method comprising:

• providing a first metal sheet;
• providing a second metal sheet;
• wherein each of the first and second metal sheets are made of an aluminum based material and include an inwardly facing surface;
• applying an intermediate layer to the inwardly facing surfaces of the first and second metal sheets at a consistent thickness and coextensive with the inwardly facing surface to passivate the inwardly facing surface;
• wherein the intermediate layer includes one of titanium, zirconium, and tri-chromium oxide;
• applying an adhesive core material to the inwardly facing surface of the first metal sheet at a uniform thickness and coextensive with the inwardly facing surface, such that the intermediate layer is disposed between the adhesive core material and first metal sheet;
• wherein the adhesive core material is made of a viscoelastic material;
• laminating the first metal sheet to the second metal sheet such that the adhesive core material is disposed between the first and second metal sheets to form the laminate structure;
• and
• wherein the steps of applying the intermediate layer, applying the adhesive core material, and laminating the first metal sheet to the second metal sheet are performed sequentially in a continuous operation.