Aluminum alloy
Aluminum alloy usually use copper, zinc, manganese, silicon, magnesium and other alloy elements, the early 20th century by the German Alfred Wilm invention, the development of the aircraft to help greatly, after a World War II German aluminum alloy composition is classified as state secrets. Compared with the ordinary carbon steel has a lighter and corrosion-resistant performance, but the corrosion resistance is not as pure aluminum. In the clean, dry environment, the surface of the aluminum alloy will form a protective oxide layer. Causes galvanic corrosion (Galvanic corrosion) to accelerate the situation: aluminum and stainless steel contact with the situation, other metal corrosion potential than aluminum or low in the wet environment. If aluminum and stainless steel to be used together must be in water-containing systems or outdoor installation of intermetallic electronic or electrolytic isolation. The composition of the aluminum alloy needs to be registered with the American Aluminum Association (AA). Many organizations have published more specific standards for the manufacture of aluminum alloys, including the Society of Automotive Engineers (SAE), especially the aviation standards, as well as the American Society for Testing and Materials (ASTM). ...