A composite material consisting of aluminum alloy with a thin outer layer of pure aluminum or another protective metal bonded to its surface.
Portmanteau of 'aluminum' and 'clad' (clothed/covered), coined in the 20th century as aviation and aerospace industries needed stronger materials with corrosion resistance.
Alclad is sandwich-like materials that give you the best of both worlds—a strong core with a corrosion-resistant skin—which became crucial for airplane bodies that need to resist salt air and weather.
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