Duralumin and Its Corrosion
A 1927 technical memorandum from the US National Advisory Committee for Aeronautics (NACA) on corrosion in duralumin, an aluminium alloy used for aircraft parts. It was written for aeronautical engineers and metallurgists studying how the metal fails in air, fuel and seawater. The pictures are plain black-and-white photographs of test strips and corroded sheet, showing mottled grey surfaces and dark pitting that a designer could use as raw material for weathered or corroded textures.
