EA009889B1 - Aluminium-based alloy - Google Patents

Abstract

The invention relates to aluminum-based alloys, for use in electrical industry, where high strength and corrosion stability are required.The invention is aimed at increasing alloy stability to pitting corrosion. The aim is achieved by adding into alumino-iron (iron content up to 3%) alloy one or more elements from rare earth group (Y, Ga, Er, Ce, Nd, Pr) in 0.005 to 0.5 % content. With minimum iron content of 0.2% to aluminum modification by yttrium reduced corrosion two times, as well as corrosion rate Al-Fe (2.18%) is also reduced two times with modification 0.005% (Ce + La) or (Ce + Nd). The most effective to eutectic composition is 0.005% gadolinium addition since corrosion rate is reduced four times. Alloying of aluminum alloy (maximum Fe content 3%) by cerium or yttrium to 0.5% reduces the corrosion rate by more than two times.The essence of the invention is to develop a composition of alumino-iron alloy modified by one or more metals from the rare earth group aimed at increasing corrosion stability against pitting corrosion.

Description

The invention relates to the metallurgy of alloys, namely aluminum alloys, which can be used for the manufacture of wires, cables, rods, products for the electrical industry, when you need a combination of sufficiently high strength with electrical conductivity, as well as a structural material, which is largely due to their resistance to corrosion [12].

Known conductor alloy based on aluminum, containing, wt.%:

Iron - 0.3-1.3

Cobalt - 0.2-1.6

Aluminum - Ost. [3], as well as aluminum alloy containing, wt.%:

Iron - 0.45-0.95

Silicon - <0.15

Aluminum - 98.95-99.45 [4].

However, the known alloys, along with good electrical conductivity and satisfactory strength properties, have an insufficiently high corrosion resistance (Table 1). The claimed alloys are characterized by increased resistance to corrosion, as evidenced by the data table. 2 in comparison with the known inventions.

The aim of the invention is to increase the corrosion resistance of the aluminum-iron alloy. To achieve this goal, at least one or more metals selected from the group of rare-earth metals are additionally introduced into the aluminum-based alloy containing iron, with the following ratio of components in wt.%: Iron — 0.2-3.0, one or more metals selected from the group of rare-earth (gadolinium, yttrium, erbium, cerium, praseodymium, neodymium), 0.005-0.50, aluminum - the rest.

The chemical composition and properties of the investigated alloys are given in Table. 2

The essence of the invention is to develop the composition of the aluminum-iron alloy, modified by one or more metals from the group of rare-earth in order to achieve improved corrosion resistance against pitting corrosion.

The corrosion-electrochemical characteristics of aluminum alloys with iron and rare-earth metals were determined in a medium of 3% solution No. С1 in a potential-dynamic mode on a potential-static complex PI-50.1 with a scan rate of 2 mV / s. All values of potentials are given on a silver chloride reference electrode. Auxiliary electrode was platinum, sealed in glass.

The advantage of the claimed composition is that the corrosion resistance of an aluminum-iron alloy modified by at least one rare earth metal is 2-2.5 times higher than that of similar alloys of composition without REM.

The proposed aluminum-based alloy can be used in the electrical industry for wires, cables as conductor materials in electronics, and also as a structural material for the manufacture of automotive and aircraft parts.

Industrial applicability is that for the production of alloys in accordance with the claimed formula can be used secondary aluminum.

Literature

1. Badalova L.M. and others. Electrochemical properties of equilibrium and rapidly quenched aluminum alloys with transition metals // Progressive methods and means of protecting metal products from corrosion: Tez. report All-Union. scientific and technical conf. Part 2, M., 1988, p. 77.

2. Filippova A.A. and others. Electrochemical properties of equilibrium and rapidly quenched aluminum alloys with iron and cerium. ibid. 78

3. US Patent No. 2099637 dated 1/27.75. Aluminum based conductor alloy.

4. U.S. Patent No. 3,512,221 dated 05.19.70. Aluminum based conductor alloy.

Table 1

No The composition of the alloy, weight. % Electrochemical characteristics, volt Corrosion rate, g / m ² · h Gay REM * -Esv. cor. -Ekor - Ed. ΔΕ pass. _{to 10} s one 0.20 - 0.66 0.72 0.62 0.30 3.4 2 2.18 - 0.78 0.73 0.61 0.36 13.4 3 3.00 - 0.62 0.74 0.60 0.35 18.4 four 0.5 1.5 Co * 0.67 0.70 0.63 0.38 33.5

silicon <0.15%, the rest is aluminum

- 1 009889

table 2

No The composition of the alloy, weight. % Electrochemical characteristics, volt Corrosion rate, g / m ² · h Gay REM * -Esv. cor. -Ekor - Ed. Aepas. one 0.20 0.005 Υ 0.66 0.71 0.63 0.33 1.7 2 0.20 0.005 Ce + ba 0.66 0.74 0.64 0.32 2.7 3 2.18 0.005 Ce + Pr 0.85 0.75 0.63 0.32 7.4 four 2.18 0.050 Ce + III 0.84 0.76 0.65 0.31 6.7 five 2.18 0.005 Υ 0.76 0.66 0.65 0.30 10.1 6 2.18 0.050 Υ 0.75 0.65 0.65 0.30 8.4 7 2.18 0.005 6 (1 0.79 0.75 0.60 0.35 3.4 eight 2.18 0.050 6ά 0.78 0.75 0.62 0.32 5.0 9 3.0 0.50 Υ 0.61 0.73 0.62 0.35 8.4 ten 3.0 0.50 Ce 0.60 0.72 0.62 0.35 7.7

* - silicon <0.15%, the rest is aluminum

Claims (1)

CLAIM An aluminum-based alloy containing iron and at least one metal from the group of rare-earth metals (REM), which has the following composition in wt.%: Iron in an amount of 0.2-3.0, one or more metals from the group of rare-earth metals in an amount of 0.005-0.50, while if the alloy contains only cerium as a metal from the REM group, its amount is 0.005-0.25, the rest is aluminum.