alumiinibronssi

Alumiinibronssi is an alloy consisting mainly of copper and aluminum, typically containing 4 to 8 percent aluminum, with minor amounts of iron, nickel, and sometimes zinc or silicon. The addition of aluminum to copper improves strength and corrosion resistance compared with pure copper or brass. Compared with other bronze types, alumiinibronssi usually demonstrates a lower density, higher electrical conductivity, and better resistance to seawater corrosion.

The alloy first emerged in the late 19th century as a response to the need for marine and hydraulic fittings that possessed both durability and a low coefficient of friction. By the 1930s a standardized classification system was adopted in the United States (ASTM B148) and in Europe, enabling manufacturers to specify grades such as A1, A3, or B1 according to precise aluminum content. In recent years, the designation has been expanded to include nickel and silicon grades produced by the European Committee for Standardization (EN 12405).

Typical applications of alumiinibronssi include marine hardware such as propeller shafts, bearings, and valves, as well as electrical equipment like motor windings and commutators, where the alloy’s low thermal expansion and good electrical conductivity are beneficial. Its resistance to biofouling and corrosion makes it a preferred choice for submerged structural components.

Manufacturing methods commonly involve casting, extrusion, or forging, often followed by heat treatment to attain the desired mechanical properties. The alloy’s high strength-to-weight ratio and excellent wear resistance contribute to its continued use in demanding engineering environments.