Aluminium bronze


Aluminium bronze
Aluminium bronze with 20% Aluminium, V=50:1

Aluminium bronze is a type of bronze in which aluminium is the main alloying metal added to copper, in contrast to standard bronze (copper and tin) or brass (copper and zinc) . A variety of aluminium bronzes of differing compositions have found industrial use, with most ranging from 5% to 11% aluminium by weight, the remaining mass being copper; other alloying agents such as iron, nickel, manganese, and silicon are also sometimes added to aluminium bronzes.

Contents

Compositions

The following table lists the most common standard aluminium bronze wrought alloy compositions, by ISO 428 designations. The percentages show the proportional composition of the alloy by weight. Copper is the remainder by weight and is not listed:

Alloy Aluminium Iron Nickel Manganese Zinc Arsenic
CuAl5 4.0% - 6.5% 0.5% max 0.8% max 0.5% max 0.5% max 0.4% max
CuAl8 7.0% - 9.0% 0.5% max 0.8% max 0.5% max 0.5% max
CuAl8Fe3 6.5% - 8.5% 1.5% - 3.5% 1.0% max 0.8% max 0.5% max
CuAl9Mn2 8.0% - 10.0% 1.5% max 0.8% max 1.5% - 3.0% 0.5% max
CuAl10Fe3 8.5% - 11.0% 2.0% - 4.0% 1.0% max 2.0% max 0.5% max
CuAl10Fe5Ni5 8.5% - 11.5% 2.0% - 6.0% 4.0% - 6.0% 2.0% max 0.5% max

Material properties

Aluminium bronzes are most valued for their higher strength and corrosion resistance as compared to other bronze alloys.[1] These alloys are tarnish-resistant and show low rates of corrosion in atmospheric conditions, low oxidation rates at high temperatures, and low reactivity with sulfurous compounds and other exhaust products of combustion. They are also resistant to corrosion in sea water. Aluminium bronzes' resistance to corrosion rests in the aluminium component of the alloys, which reacts with atmospheric oxygen to form a thin, tough surface layer of alumina (aluminium oxide) which acts as a barrier to corrosion of the copper-rich alloy. The addition of tin can improve corrosion resistance. [2]

Another notable property of aluminium bronzes are their biostatic effects. The copper component of the alloy prevents colonization by marine organisms including algae, lichens, barnacles, and mussels, and therefore can be preferable to stainless steel or other non-cupric alloys in applications where such colonization would be unwanted.

Aluminium bronzes tend to have a golden color.

Applications

Aluminium bronzes are most commonly used in applications where their resistance to corrosion makes them preferable to other engineering materials. These applications include plain bearings and landing gear components on aircraft, engine components (especially for seagoing ships), underwater fastenings in naval architecture, and ship propellers. Aluminum bronze is also used to fulfill the ATEX directive for Zones 1, 2, 21, and 22.[3] The attractive gold-toned coloration of aluminium bronzes has also led to their use in jewelry.

Aluminium bronzes are in the highest demand from the following industries and areas:

  • General sea water-related service
  • Water supply
  • Oil and petrochemical industries (i.e. tools for use in non-sparking environments)
  • Specialized anti-corrosive applications
  • Certain structural retrofit building applications

Aluminium bronze can be welded using the MIG welding technique with an aluminium bronze core and pure argon gas.

Aluminium bronze is used to replace gold for the casting of dental crowns. The alloys used are chemically inert and have the appearance of gold.

Alloys similar to aluminium bronze are used in making coins, for example the one and two dollar coins of Australian and New Zealand currency produced by the Royal Australian Mint, some Mexican coins and the Nordic gold used for some Euro coins. The Canadian 2 dollar coin, produced by the Royal Canadian Mint and circulated since 1996, is a bi-metallic piece with an outer ring of nickel and an inner circle of aluminum bronze composed of 92% copper, 6% aluminum, and 2% nickel.

References

External links


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Look at other dictionaries:

  • Aluminium bronze — Bronze Bronze, n. [F. bronze, fr. It. bronzo brown, fr. OHG. br?n, G. braun. See {Brown}, a.] 1. An alloy of copper and tin, to which small proportions of other metals, especially zinc, are sometimes added. It is hard and sonorous, and is used… …   The Collaborative International Dictionary of English

  • Aluminium bronze — Aluminium Al u*min i*um ([a^]l [ u]*m[i^]n [i^]*[u^]m), n. [L. alumen. See {Alum}.] (Chem.) same as {aluminum}, chiefly British in usage. [1913 Webster] {Aluminium bronze} or {gold}, a pale gold colored alloy of aluminium and copper, used for… …   The Collaborative International Dictionary of English

  • aluminium bronze — noun an alloy of copper and aluminum with high tensile strength and resistance to corrosion • Syn: ↑aluminum bronze • Hypernyms: ↑copper base alloy * * * aluminium bronze noun An alloy of aluminium and copper, of lighter weight than gold, but… …   Useful english dictionary

  • aluminium bronze — aliumininė bronza statusas T sritis chemija apibrėžtis Cu lydinys, turintis 6–11% Al, iki 5,5% Fe, iki 5,5% Ni, iki 2% Mn. atitikmenys: angl. aluminium bronze rus. алюминиевая бронза …   Chemijos terminų aiškinamasis žodynas

  • aluminium bronze — noun an alloy of copper and aluminium …   English new terms dictionary

  • Bronze — Bronze, n. [F. bronze, fr. It. bronzo brown, fr. OHG. br?n, G. braun. See {Brown}, a.] 1. An alloy of copper and tin, to which small proportions of other metals, especially zinc, are sometimes added. It is hard and sonorous, and is used for… …   The Collaborative International Dictionary of English

  • Bronze age — Bronze Bronze, n. [F. bronze, fr. It. bronzo brown, fr. OHG. br?n, G. braun. See {Brown}, a.] 1. An alloy of copper and tin, to which small proportions of other metals, especially zinc, are sometimes added. It is hard and sonorous, and is used… …   The Collaborative International Dictionary of English

  • Bronze powder — Bronze Bronze, n. [F. bronze, fr. It. bronzo brown, fr. OHG. br?n, G. braun. See {Brown}, a.] 1. An alloy of copper and tin, to which small proportions of other metals, especially zinc, are sometimes added. It is hard and sonorous, and is used… …   The Collaborative International Dictionary of English

  • Aluminium — Al u*min i*um ([a^]l [ u]*m[i^]n [i^]*[u^]m), n. [L. alumen. See {Alum}.] (Chem.) same as {aluminum}, chiefly British in usage. [1913 Webster] {Aluminium bronze} or {gold}, a pale gold colored alloy of aluminium and copper, used for journal… …   The Collaborative International Dictionary of English

  • Aluminium — Infobox aluminiumAluminium (Audio IPA|En uk aluminium1.ogg|ˌæljʊˈmɪniəm, IPA|/ˌæljəˈmɪniəm/) or aluminum (Audio IPA|En uk aluminum.ogg|/əˈluːmɪnəm/, see spelling below) is a silvery white and ductile member of the boron group of chemical elements …   Wikipedia


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