Alclad

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Alclad is a trademark of Alcoa used as a generic term to describe corrosion resistant Aluminium sheet formed from high-purity aluminium surface layers metallurgically bonded to high strength Aluminium Alloy core material. These sheets commonly used by the aircraft industry^[1].

Described in NACA-TN-259, of August 1927, as "a new corrosion resistant aluminum product which is markedly superior to the present strong alloys. Its use should result in greatly increased life of a structural part. Alclad is a heat-treated aluminum, copper, manganese, magnesium alloy that has the corrosion resistance of pure metal at the surface and the strength of the strong alloy underneath. Of particular importance is the thorough character of the union between the alloy and the pure aluminum. Preliminary results of salt spray tests (24 weeks of exposure) show changes in tensile strength and elongation of Alclad 17ST, when any occurred, to be so small as to be well within the limits of experimental error."

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