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ALCLADAluminum Clad
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Also in 1927, Alcoa signed a contract to supply the Alclad version of 17S for construction of two new, larger dirigibles, the Akron and the Macon, which were to be monuments to the dead of the Shenandoah disaster.
They have found that a partial cladding layer covering only 7% of the core aluminum substrate provides equivalent corrosion protection to the mechanical properties of Al 2024 T3 when compared to Alclad products after a 300hour immersion exposure in a neutral 3.5% NaCl solution.
For comparison, medium scale test panels in both the as-received Alclad state and having the entire cladding layer removed have also been produced.
Initially a single clad spot test panel was produced from 6.35 mm thick Alclad Al 7075 T651 plate having a total area exposed to the corrosion environment of 10 x 10 [cm.sup.2] with a square 1 [cm.sup.2] clad spot located in the panel center.
A series of medium scale test panels were produced again from 6.35 mm thick Alclad Al 7075 T651 plate to investigate if a partial cladding pattern provides equivalent corrosion resistance when compared to Alclad in the selected corrosion environment.
Alclad means full clad, while spot clad (partial clad) and unclad were machined to remove part or all of the clad layer.