Alclad is a corrosion resistant aluminium sheet formed from high purity aluminium surface layers metallurgically bonded rolled onto to high strength aluminium alloy core material.
Clad aluminium sheet.
Alclad is a trademark of alcoa but the term is also used generically.
An example of clad aluminum is the surface of unpainted aircraft.
An extremely thin sheet of pure aluminum laminated onto each side of an aluminum alloy sheet improves the corrosion resistance with little impairment of strength.
2024t3 alclad aluminum sheet aluminum alloy sheet is sold in the thicknesses and sheet sizes shown in the table.
But it has little or no structural strength.
Minimum sheet size available is 2 x 4.
Order by part number.
Corrosion resistance and machinability are rated as fair though the addition of chromium provides good stress corrosion cracking resistance in 7075 aluminum sheet products.
Not all aircraft sheet aluminum is clad especially those alloy sheets from which small brackets gussets and fittings are made.
As with alloy 2024 alloy 7075 is available in bare form or in clad alclad to offer even further protection from corrosion.
Pure aluminum has considerable corrosion resistance compared to aluminum alloys.