阅读说明：本技术 一种高导耐蚀高镍含铝铜合金及其制备方法 (High-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy and preparation method thereof ) 是由 向紫琪 申会员 何洋 赵波 于 2021-07-29 设计创作，主要内容包括：本发明提供了一种高导耐蚀高镍含铝铜合金及其制备方法,属于合金材料技术领域。所述高导耐蚀高镍含铝铜合金,按质量百分比计,包括以下化学成分：Sn：0.8～1.2wt％；Ni：0.8～1.2wt％；Al：0.4～0.6wt％；Zn：0.1～0.8wt％；Si：0.10～0.20wt％,Zr：0.01～0.30wt％；余量是Cu和不可避免的杂质。本发明通过控制铜合金中Sn、Ni、Al、Zn、Si、Zr含量,通过成分之间的协同作用,赋予铜合金优异的力学性能、耐腐蚀性以及导电性能。(The invention provides a high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy and a preparation method thereof, belonging to the technical field of alloy materials. The high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy comprises the following chemical components in percentage by mass: sn: 0.8-1.2 wt%; ni: 0.8-1.2 wt%; al: 0.4-0.6 wt%; zn: 0.1-0.8 wt%; si: 0.10 to 0.20 wt%, Zr: 0.01-0.30 wt%; the balance being Cu and unavoidable impurities. According to the invention, the contents of Sn, Ni, Al, Zn, Si and Zr in the copper alloy are controlled, and the copper alloy is endowed with excellent mechanical property, corrosion resistance and conductivity through the synergistic effect of the components.)

1. The high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy is characterized by comprising the following chemical components in percentage by mass:

sn: 0.8-1.2 wt%; ni: 0.8-1.2 wt%; al: 0.4-0.6 wt%; zn: 0.1-0.8 wt%; si: 0.10 to 0.20 wt%, Zr: 0.01-0.30 wt%; the balance being Cu and unavoidable impurities.

2. The high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy as claimed in claim 1, wherein the mass percentage of Zn is 0.4-0.6 wt%.

3. The high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy according to claim 1, wherein the mass percent of Zr is 0.05-0.10 wt%.

4. The high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy as claimed in claim 1, wherein the mass percentage of Fe impurity is less than or equal to 0.01 wt%.

5. The method for preparing the high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy according to claim 1, comprising the following steps:

weighing the raw materials according to the mass percentage ratio, putting the raw materials into a smelting furnace, and smelting to obtain an alloy melt; continuously casting the alloy melt into a plate blank on a horizontal continuous casting machine set; cooling the plate blank to room temperature after carrying out homogenization annealing; milling a surface; preserving the heat of the treated plate blank at 680-720 ℃ for 1-2 h, and then carrying out multi-pass hot rolling and acid pickling; and then, carrying out multi-pass cold finish rolling, and then carrying out stress relief annealing on the finish-rolled plate blank in a nitrogen atmosphere or an ammonia decomposition atmosphere to obtain the copper alloy strip.

6. The manufacturing method according to claim 5, wherein the thickness of the slab continuously cast on the horizontal continuous casting machine set is 15 to 25 mm.

7. The method of claim 5, wherein the homogenizing anneal is: and preserving heat for 2-4 h at 380-420 ℃, then heating to 680-720 ℃, and preserving heat for 2-3 h.

8. The preparation method of the steel plate blank according to claim 5, characterized by carrying out 8-15 hot rolling, wherein the deformation of each hot rolling is 10-30%, keeping the temperature at 680-720 ℃ for 0.5-1 h after each 5 hot rolling, and then continuing hot rolling until the thickness of the plate blank is 1-3 mm in the last hot rolling.

9. The production method according to claim 5, wherein the deformation of each cold finish rolling is 10 to 15%, and the total deformation of the slab is 65 to 70%.

10. The method according to claim 5, wherein the stress relief annealing temperature is 300 to 330 ℃ and the annealing time is 2 to 6 hours.

Technical Field

The invention belongs to the technical field of alloy materials, and relates to a high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy and a preparation method thereof.

Background

In recent years, with the rapid increase of economic level and the rapid increase of the number of new house decorations, the public has higher and higher requirements on power connection and electricity utilization extensibility products such as converters (extension line sockets, mobile sockets and the like), wall switch sockets, LED lighting, digital accessories and the like, and the novel house decoration light is fashionable in appearance, safe, durable and suitable for various climates. Therefore, higher requirements are put forward on the mechanical property and the environment-friendly corrosion resistance of the electronic and electric conductive copper alloy.

CN109609801A discloses a high-performance copper alloy and a preparation method thereof, wherein the copper alloy comprises the following components in percentage by weight: sn: 0.05 wt% -3.0 wt%, Ni: 0.01 wt% -2.5 wt%, Si: 0.01 wt% -0.6 wt%, Zn: 5 to 15 weight percent, but the Zn content is high, so that dezincification corrosion is easy to occur in a high-salt environment, and the corrosion resistance is insufficient. CN103088229A discloses a low-cost copper alloy for connector and its processing method, which utilizes a semi-continuous casting method with low yield and production efficiency to produce the alloy, resulting in increased production cost, and its conductivity is low, only 10-16% IACS.

Although the alloy has excellent performance in some aspects, the alloy cannot meet the requirements of mechanical property and environment-friendly corrosion resistance of the current electronic and electric conductive copper alloy, and meanwhile, the production cost is high.

Disclosure of Invention

Aiming at the defects of the performance of the copper alloy in the prior art, the invention provides a copper alloy material which has high mechanical property, high corrosion resistance and excellent conductivity.

The invention provides a high-conductivity corrosion-resistant high-nickel aluminum-containing copper alloy, which comprises the following chemical components in percentage by mass:

sn: 0.8-1.2 wt%; ni: 0.8-1.2 wt%; al: 0.4-0.6 wt%; zn: 0.1-0.8 wt%; si: 0.10 to 0.20 wt%, Zr: 0.01-0.30 wt%; the balance being Cu and unavoidable impurities.

In the invention, 0.8-1.2 wt% of Sn is added, so that the elasticity of the alloy can be improved and the wear resistance can be improved; when the Sn content is less than 0.8 wt%, the mechanical properties of the alloy are low, and when it exceeds 1.2 wt%, the conductivity is lowered. The addition of Ni can ensure the solid solution strengthening of the copper alloy and generate a small amount of Ni₂Strengthening by Si second phase particles; when the Ni content is less than 0.8 wt%, the mechanical properties of the alloy are low, while exceeding 1.2 wt% results in a decrease in electrical conductivity. The addition of Al can form a thin-layer compact oxide film after the surface of the alloy is oxidized, so that the further corrosion of a copper matrix can be prevented, and when the content of Al is less than 0.4 wt%, the thin-layer compact oxide film cannot be formed, so that the corrosion resistance is reduced; when the amount of the additive is more than the required amount, the conductivity of the alloy is reduced; therefore, the addition of Al is limited to 0.4 to 0.6 wt%.

Preferably, the mass percentage of Zn in the copper alloy is 0.4-0.6 wt%. The Zn element is added mainly to improve the melt. The Zn content is too low, which can cause poor quality of alloy melt and increase the manufacturing cost; too high a content results in a decrease in corrosion resistance.

Preferably, the mass percentage of Zr in the copper alloy is 0.05-0.10 wt%. When the Zr content is increased, the melt can be improved theoretically, the grain refining effect can be enhanced, but in terms of actual mechanical properties, too much Zr content does not have an effect, the uniformity control difficulty of the alloy melt is increased due to too much Zr content, the material cost is increased, and the alloy production cost is not controlled favorably. The Zr content is reduced, so that the cost can be reduced theoretically, but the Zr content is low, the alloy grain refinement effect is influenced, the mechanical property and the corrosion resistance of the alloy are reduced, and the application of the alloy is not facilitated; at the same time, melt control is also affected, which in turn increases production costs. Therefore, the Zr content of the copper alloy is further controlled to be 0.05-0.10 wt%.

Preferably, the content of impurity Fe in the copper alloy is less than or equal to 0.01 wt%.

The invention also provides a preparation method of the high-conductivity and corrosion-resistant high-nickel aluminum-containing copper alloy, which comprises the following steps:

weighing the raw materials according to the mass percentage ratio, putting the raw materials into a smelting furnace, and smelting to obtain an alloy melt; continuously casting the alloy melt into a plate blank on a horizontal continuous casting machine set; cooling the plate blank to room temperature after carrying out homogenization annealing; milling a surface; preserving the heat of the treated plate blank at 680-720 ℃ for 1-2 h, then carrying out multi-pass hot rolling, and removing surface oxides by acid washing; and then, carrying out multi-pass cold finish rolling, and then carrying out stress relief annealing on the finish-rolled plate blank in a nitrogen atmosphere or an ammonia decomposition atmosphere to obtain the copper alloy strip.

In the preparation method of the copper alloy, the smelting steps are as follows: adding pure copper and pure nickel into a smelting furnace, then adding a covering agent, and heating to 1190-1280 ℃ for melting; after melting, controlling the furnace temperature at 1180-1210 ℃, and adding pure tin for melting; after melting, adding Cu-Si intermediate alloy and Cu-Al intermediate alloy for melting; and adding pure zinc after melting, adding a Cu-Zr intermediate alloy after melting, adding a refining agent after melting, stirring and fishing slag to obtain an alloy melt.

Preferably, the thickness of the slab continuously cast on the horizontal continuous casting unit is 15-25 mm.

Preferably, the homogenizing anneal is: and preserving heat for 2-4 h at 380-420 ℃, then heating to 680-720 ℃, and preserving heat for 2-3 h.

Preferably, 8-15 hot rolling passes are carried out, the hot rolling deformation of each pass is 10-30%, the temperature is kept at 680-720 ℃ for 0.5-1 h after each 5 hot rolling passes, and then the hot rolling is continued until the thickness of the plate blank is 1-3 mm in the last hot rolling pass.

Preferably, the deformation of each cold finish rolling is 10-15%, and the total deformation of the plate blank is 65-70%.

Preferably, the stress relief annealing temperature is 300-330 ℃, and the annealing time is 2-6 h.

The copper alloy of the invention refines material grains through the combined regulation and control of homogenizing annealing, multi-pass hot rolling, multi-pass cold finish rolling and stress relief annealing process, obtains fine and uniform matrix structure, and enables second phase particles strengthened to be fully separated out from the matrix, thereby effectively improving the mechanical property, the corrosion resistance and the conductivity of the material.

Compared with the prior art, the invention has the following beneficial effects:

1. the copper alloy comprises Sn, Ni, Al, Zn, Si and Zr components, and excellent mechanical property, corrosion resistance and electric conductivity are endowed to the copper alloy through the synergistic effect among the components.

2. The content of Sn, Ni and Al in the copper alloy is controlled within a proper range, so that the performance of the copper alloy is greatly improved;

3. the copper alloy disclosed by the invention has the advantages that the contents of Si, Zn and Zr are reasonably controlled, the alloy melt can be effectively purified, the crystal grains of a casting blank can be refined, the alloy smelting and casting performance and the processing performance are good, and the electric conductivity is high;

4. the copper alloy of the invention is subjected to combined regulation and control of homogenizing annealing, multi-pass hot rolling, multi-pass cold finish rolling and stress relief annealing process, so that material grains are refined, a fine and uniform matrix structure is obtained, and second phase particles for strengthening are fully separated out from the matrix, thereby obtaining a copper alloy plate with more excellent mechanical property;

Detailed Description

The technical solutions of the present invention are further described and illustrated below by specific examples, it should be understood that the specific examples described herein are only for the purpose of facilitating understanding of the present invention, and are not intended to be specific limitations of the present invention. The raw materials used in the examples of the present invention are those commonly used in the art, and the methods used in the examples are those conventional in the art, unless otherwise specified.

Example 1

The # 1 copper alloy prepared in this example consisted of the following chemical components: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The No. 1 copper alloy is prepared by the following preparation method:

adding pure copper and pure nickel into a smelting furnace, adding a covering agent to calcine charcoal, and heating to 1250 ℃ for melting; after melting, controlling the furnace temperature at 1195 ℃, and adding pure tin for melting; after melting, adding Cu-10Si intermediate alloy and Cu-30Al intermediate alloy for melting; adding pure zinc after melting, adding a Cu-50Zr intermediate alloy after melting, adding cryolite and calcium fluoride after melting, stirring and fishing slag to obtain an alloy melt;

continuously casting the alloy melt on a horizontal continuous casting machine set into a plate blank with the thickness of about 20 mm;

heating the plate blank to 400 ℃, preserving heat for 2h, then heating to 700 ℃, preserving heat for 2h, and cooling in air to room temperature; milling a surface and removing surface defects;

and (3) carrying out hot rolling on the plate blank after surface milling, wherein the heat preservation temperature before hot rolling is 700 ℃, the heat preservation time is 1h, the first-pass hot rolling is carried out, the deformation is 20%, the second-pass hot rolling is carried out, the deformation is controlled to be 25%, the third-pass hot rolling is carried out, the deformation is 25%, the fourth-pass hot rolling is carried out, the deformation is 20%, the fifth-pass hot rolling is carried out, the deformation is 15%, the furnace returning and heat preservation are carried out after the fifth-pass hot rolling, the heat preservation temperature is 700 ℃, and the heat preservation time is 0.5 h. Continuously hot rolling, wherein the hot rolling deformation of each pass is 10-20%, and the plate blank is subjected to hot rolling of 12 passes in total until the thickness of the plate blank is 2 mm; performing acid washing after air cooling to remove the oxide on the surface;

and (3) carrying out finish rolling on the hot-rolled plate blank by using a cold rolling process, wherein the cold rolling deformation of each pass is 10-15%, the plate thickness is 0.6mm after the finish rolling, and then carrying out stress relief annealing at the temperature of 300 ℃ for 3h to obtain the copper alloy plate.

Example 2

The 2# copper alloy prepared in this example consisted of the following chemical components: sn: 1.2 wt%; ni: 1.2 wt%; al: 0.6 wt%; zn: 0.4 wt%; si: 0.10 wt%; zr: 0.08 wt%.

The 2# copper alloy is prepared by the following preparation method:

adding pure copper and pure nickel into a smelting furnace, adding a covering agent to calcine charcoal, and heating to 1280 ℃ for melting; after melting, controlling the furnace temperature at 1210 ℃, and adding pure tin for melting; after melting, adding Cu-10Si intermediate alloy and Cu-30Al intermediate alloy for melting; adding pure zinc after melting, adding a Cu-50Zr intermediate alloy after melting, adding cryolite and calcium fluoride after melting, stirring and fishing slag to obtain an alloy melt;

continuously casting the alloy melt on a horizontal continuous casting unit to form a plate blank with the thickness of about 22 mm;

heating the plate blank to 420 ℃, preserving heat for 3h, then heating to 720 ℃, preserving heat for 3h, and cooling in air to room temperature; milling a surface and removing surface defects;

and (3) carrying out hot rolling on the plate blank after surface milling, wherein the heat preservation temperature before hot rolling is 720 ℃, the heat preservation time is 1h, the first-pass hot rolling is carried out, the deformation is 20%, the second-pass hot rolling is carried out, the deformation is controlled to be 25%, the third-pass hot rolling is carried out, the deformation is 25%, the fourth-pass hot rolling is carried out, the deformation is 20%, the fifth-pass hot rolling is carried out, the deformation is 15%, the furnace returning and heat preservation are carried out after the fifth-pass hot rolling, the heat preservation temperature is 720 ℃, and the heat preservation time is 0.5 h. Continuously hot rolling, wherein the hot rolling deformation of each pass is 10-20%, and the plate blank is subjected to hot rolling of 15 passes in total until the thickness of the plate blank is 1.75 mm; performing acid washing after air cooling to remove the oxide on the surface;

and (3) carrying out finish rolling on the hot-rolled plate blank by using a cold rolling process, wherein the cold rolling deformation of each pass is 10-15%, the finish rolling is carried out until the plate thickness is 0.6mm, then carrying out stress relief annealing at the temperature of 330 ℃ for 4h, and thus obtaining the copper alloy plate.

Example 3

The 3# copper alloy prepared in this example consisted of the following chemical components: sn: 0.8 wt%; ni: 0.8 wt%; al: 0.4 wt%; zn: 0.6 wt%; si: 0.2 wt%; zr: 0.05 wt%.

The 3# copper alloy is prepared by the following preparation method:

adding pure copper and pure nickel into a smelting furnace, adding a covering agent to calcine charcoal, and heating to 1200 ℃ for melting; after melting, controlling the furnace temperature at 1180 ℃, and adding pure tin for melting; after melting, adding Cu-10Si intermediate alloy and Cu-30Al intermediate alloy for melting; adding pure zinc after melting, adding a Cu-50Zr intermediate alloy after melting, adding cryolite and calcium fluoride after melting, stirring and fishing slag to obtain an alloy melt;

continuously casting the alloy melt on a horizontal continuous casting machine set into a plate blank with the thickness of about 18 mm;

heating the plate blank to 380 ℃ and preserving heat for 3h, then heating to 700 ℃ and preserving heat for 2h, and air-cooling to room temperature; milling a surface and removing surface defects;

and (3) carrying out hot rolling on the plate blank after surface milling, wherein the heat preservation temperature before hot rolling is 700 ℃, the heat preservation time is 2h, the first-pass hot rolling is carried out, the deformation is 20%, the second-pass hot rolling is carried out, the deformation is controlled to be 25%, the third-pass hot rolling is carried out, the deformation is 25%, the fourth-pass hot rolling is carried out, the deformation is 20%, the fifth-pass hot rolling is carried out, the deformation is 15%, the furnace returning and heat preservation are carried out after the fifth-pass hot rolling, the heat preservation temperature is 720 ℃, and the heat preservation time is 0.5 h. Continuously hot rolling, wherein the hot rolling deformation of each pass is 10-20%, and the plate blank is subjected to hot rolling of 13 passes in total until the thickness of the plate blank is 1.8 mm; performing acid washing after air cooling to remove the oxide on the surface;

and (3) carrying out finish rolling on the hot-rolled plate blank by using a cold rolling process, wherein the cold rolling deformation of each pass is 10-15%, the finish rolling is carried out until the plate thickness is 0.6mm, then carrying out stress relief annealing at the temperature of 300 ℃ for 5h, and thus obtaining the copper alloy plate.

Example 4

The 4# copper alloy prepared in this example consisted of the following chemical components: sn: 1.3 wt%; ni: 1.3 wt%; al: 0.7 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The preparation method of the 4# copper alloy is the same as that of the 1# copper alloy.

Example 5

The 5# copper alloy prepared in this example consisted of the following chemical components: sn: 0.7 wt%; ni: 0.7 wt%; al: 0.3 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The preparation method of the 5# copper alloy is the same as that of the 1# copper alloy.

Example 6

The No. 6 copper alloy prepared in the embodiment consists of the following chemical components: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.11 wt%.

The preparation method of the No. 6 copper alloy is the same as that of the No. 1 copper alloy.

Example 7

The 7# copper alloy prepared in this example consisted of the following chemical components: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.04 wt%.

The preparation method of the 7# copper alloy is the same as that of the 1# copper alloy.

Example 8

The 8# copper alloy prepared in this example consisted of the following chemical components: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.2 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The preparation method of the 8# copper alloy is the same as that of the 1# copper alloy.

Example 9

The 9# copper alloy prepared in this example consisted of the following chemical components: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.8 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The preparation method of the 9# copper alloy is the same as that of the 1# copper alloy.

Comparative example 1

The composition of the 10# copper alloy in comparative example 1 was: sn: 2.0 wt%; ni: 0.2 wt%; zn: 0.1 wt%; p: 0.10 wt%; the balance being Cu and unavoidable impurities. Semi-hard state, plate thickness 0.6 mm.

The alloy is a copper alloy which is used for the plug bush by bull group.

Comparative example 2

The composition of the 11# copper alloy in comparative example 2 was: sn: 2.0 wt%; ni: 0.6 wt%; zn: 0.4 wt%; p: 0.30 wt%; the balance being Cu and unavoidable impurities. Semi-hard state, plate thickness 0.6 mm.

The alloy is a novel copper alloy for plug bushes researched and developed by the industry group for bull group.

Comparative example 3

The 12# copper alloy of comparative example 3 consists of the following chemical composition: sn: 1.0 wt%; ni: 1.0 wt%; al: 0.5 wt%; zn: 0.5 wt%; si: 0.15 wt%; zr: 0.05 wt%.

The 12# copper alloy is prepared by the following preparation method:

adding pure copper and pure nickel into a smelting furnace, adding a covering agent to calcine charcoal, and heating to 1250 ℃ for melting; after melting, controlling the furnace temperature at 1195 ℃, and adding pure tin for melting; after melting, adding Cu-10Si intermediate alloy and Cu-30Al intermediate alloy for melting; adding pure zinc after melting, adding a Cu-50Zr intermediate alloy after melting, adding cryolite and calcium fluoride after melting, stirring and fishing slag to obtain an alloy melt;

continuously casting the alloy melt on a horizontal continuous casting machine set into a plate blank with the thickness of about 20 mm;

heating the plate blank to 700 ℃, preserving heat for 4h, and then air-cooling to room temperature; milling a surface and removing surface defects;

and (3) carrying out hot rolling on the plate blank after surface milling, wherein the heat preservation temperature before hot rolling is 700 ℃, the heat preservation time is 1h, the first-pass hot rolling is carried out, the deformation is 20%, the second-pass hot rolling is carried out, the deformation is controlled to be 25%, the third-pass hot rolling is carried out, the deformation is 25%, the fourth-pass hot rolling is carried out, the deformation is 20%, the fifth-pass hot rolling is carried out, the deformation is 15%, the furnace returning and heat preservation are carried out after the fifth-pass hot rolling, the heat preservation temperature is 700 ℃, and the heat preservation time is 0.5 h. Continuously hot rolling, wherein the hot rolling deformation of each pass is 10-20%, and the plate blank is subjected to hot rolling of 12 passes in total until the thickness of the plate blank is 2 mm; performing acid washing after air cooling to remove the oxide on the surface;

and (3) carrying out finish rolling on the hot-rolled plate blank by using a cold rolling process, wherein the cold rolling deformation of each pass is 10-15%, the plate thickness is 0.6mm, then carrying out stress relief annealing at the temperature of 200 ℃ for 3h, and thus obtaining the copper alloy plate.

The copper alloy samples of examples 1 to 9 and comparative examples 1 to 3 were subjected to mechanical property and conductivity tests, and the results are shown in table 1:

TABLE 1 mechanical and conductive Properties of copper alloys of examples 1 to 9 and comparative examples 1 to 3

The 1#, 2#, and 3# copper alloys are reasonably added, so that the copper alloys have more excellent mechanical properties on the basis of excellent conductivity. The 4# alloy has higher contents of Sn, Ni and Al, has more outstanding mechanical properties, but has lower conductivity and lower elongation, and causes higher processing cost and raw material cost. The 5# alloy has low Sn, Ni and Al contents, so that the mechanical property is reduced, and the corrosion resistance effect is influenced. On the basis that the No. 6 alloy is the No. 1 alloy, the Zr content is increased, the aims of improving the melt and enhancing the grain refining effect are achieved, the effect is not achieved in the aspect of actual mechanical property, the uniformity control difficulty of the alloy melt is increased due to the increase of the Zr content, the material cost is increased, and the control on the production cost of the alloy is not favorable. On the basis that the 7# alloy is the 1# alloy, the Zr content is reduced, so that the cost is reduced, but the Zr content is low, the grain refinement effect of the alloy is influenced, the mechanical property of the alloy is reduced, and the application of the alloy is not facilitated; and meanwhile, melt control is influenced, and the production cost is increased. The 8# alloy is 1# alloy, the Zn content is reduced, the 9# alloy is 1# alloy, the Zn content is increased, and the tensile strength of the alloy is reduced due to too much or too little Zn content. Compared with the alloy No. 1, the homogenizing annealing and stress relief annealing steps adopted in the preparation process of the alloy No. 12 are different from those of the alloy No. 1, so that the mechanical property and the conductivity of the alloy No. 12 are slightly reduced compared with those of the alloy No. 1.

The final plates of the copper alloys of examples 1-9 and comparative examples 1-3 were sampled and polished by the method of GB/T10125-. The corroded weight loss sample is subjected to diluted HNO₃The cleaning time is 10min, and the corrosion weight loss rate of the copper alloy in neutral salt fog is shown in table 2.

TABLE 2 Corrosion resistance of copper alloys of examples 1-9 and comparative examples 1-3

As shown in Table 2, the alloy No. 1, 2, 3, 4, 6 and 8 has a weight loss rate lower than that of the alloy No. 5, 7, 9, 10, 11 and 12 at different arrangement angles and different corrosion times, which indicates that the alloy has the best corrosion resistance. The 5# alloy cannot obtain better corrosion resistance due to lower Al content. Although the 4# alloy has better corrosion performance, the cost is increased by excessively high Sn, Ni and Al, the elongation and the conductivity are low, the alloy material and processing cost are increased, and the key conductivity is reduced. The 7# alloy has poor alloy ingot casting uniformity due to the reduction of Zr content, and the reduction of grain refining effect causes the reduction of alloy corrosion resistance. The alloy melt of No. 8 is not easy to regulate and control due to the excessively low Zn content, and the production cost is increased. And the corrosion resistance of the alloy is reduced due to the over-high Zn content in No. 9. The 12# alloy has a small reduction in corrosion resistance relative to the 1# alloy due to improper homogenization annealing and stress relief annealing processes. Therefore, the alloy with balanced mechanical property and corrosion resistance can be obtained only by ensuring proper contents of Sn, Ni, Al, Zn and Zr; and more excellent mechanical property and corrosion resistance can be obtained by selecting a proper preparation process.

Finally, it should be noted that the specific examples described herein are merely illustrative of the spirit of the invention and do not limit the embodiments of the invention. Various modifications, additions and substitutions for the embodiments described herein will occur to those skilled in the art, and all such embodiments are neither required nor possible. While the invention has been described with respect to specific embodiments, it will be appreciated that various changes and modifications may be made without departing from the spirit and scope of the invention, as defined by the appended claims.