A copper-nickel-tin wear-resistant corrosion-resistant copper alloy and a preparation method thereof

Abstract

This invention provides a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy and its preparation method, belonging to the field of copper alloy manufacturing technology. The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, comprises the following chemical composition: Ni: 8.7–10.0%, Sn: 2.0–6.5%, Fe≤0.6%, Mn≤0.2%; Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.15%, and the balance Cu. The results of the examples show that the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention has a tensile strength of 687–736 MPa, a yield strength of 574–680 MPa, and an elongation A… 50 The carbon content is 15.5%–17.5%, the hardness is 201–223 HV, the conductivity is >11.7% IACS, and the copper alloy also has excellent wear resistance and corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of copper alloy manufacturing technology, and in particular to a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy and its preparation method. Background Technology

[0002] Copper-nickel-tin alloy, or CuNiSn alloy for short, is a high-strength, high-elastic-modulus alloy material composed of copper, nickel, and tin. It is an environmentally friendly, elastic copper-based alloy with excellent corrosion resistance, oxidation resistance, electrovacuum properties, thermal stability, wear resistance, and tensile strength. It is widely used in electronics, electroplating, power, machinery, automotive, shipbuilding, and aerospace industries. Specifically, in electronics, CuNiSn alloy is used in the manufacture of high-quality electronic components such as mobile phone antennas, focusing springs for mobile phone camera motors, and microwave components; in power, it is used in the manufacture of power system components such as relays, switch springs, and connectors; in the automotive industry, it is used in the manufacture of automotive engine valves, piston rings, and connectors; and in aerospace, it is used in the manufacture of aircraft blades, turbines, and heavy-duty bearings.

[0003] With the development of technology, the copper-nickel-tin alloys currently sold on the market can no longer meet the technical requirements. Therefore, how to improve the mechanical properties of copper-nickel-tin alloys has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy and its preparation method. The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention has high tensile strength and yield strength, and also has excellent wear resistance and corrosion resistance.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] This invention provides a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, which, by mass percentage, comprises the following chemical composition: Ni: 8.7-10.0%, Sn: 2.0-6.5%, Fe≤0.6%, Mn≤0.2%, Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.15%, and the balance Cu.

[0007] Preferably, by mass percentage, it comprises the following chemical components: Ni: 8.7-9.4%, Sn: 6.0-6.5%, Fe≤0.5%, Mn: 0.08-0.12%; Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.12% and the balance Cu.

[0008] Preferably, by mass percentage, it comprises the following chemical composition: Ni: 9.0-10.0%, Sn: 2.0-2.5%, Fe≤0.6%, Mn≤0.2%; Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.10% and the balance Cu.

[0009] This invention provides a method for preparing the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy described in the above technical solution, comprising the following steps:

[0010] (1) The alloy raw materials are sequentially melted, horizontally continuously cast and milled to obtain a cast billet;

[0011] (2) The billet obtained in step (1) is subjected to bell-type annealing to obtain the first annealed strip;

[0012] (3) The first annealed strip obtained in step (2) is subjected to initial rolling to obtain an initial rolled strip;

[0013] (4) The initial rolled strip obtained in step (3) is continuously annealed to obtain the second annealed strip;

[0014] (5) The second annealed strip obtained in step (4) is precision rolled to obtain a precision rolled strip;

[0015] (6) The finely rolled strip obtained in step (5) is subjected to low-temperature annealing to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy.

[0016] Preferably, the temperature of horizontal continuous casting in step (1) is 1150-1200℃.

[0017] Preferably, the temperature of the bell annealing in step (2) is 750-850°C, and the holding time of the bell annealing is 6-10 hours.

[0018] Preferably, the total deformation of the initial rolling in step (3) is 85-95%, and the deformation per pass of the initial rolling is 5-20%.

[0019] Preferably, the temperature of continuous annealing in step (4) is 950 to 1000°C, and the rate of continuous annealing is 1.0 to 2.5 m / min.

[0020] Preferably, the total deformation of the finishing rolling in step (5) is 20-30%, and the deformation per pass of the finishing rolling is 2-15%.

[0021] Preferably, the temperature of the low-temperature annealing treatment in step (6) is 350-400°C, and the time of the low-temperature annealing treatment is 6-10 hours.

[0022] This invention provides a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, which, by mass percentage, comprises the following chemical composition: Ni: 8.7-10.0%, Sn: 2.0-6.5%, Fe≤0.6%, Mn≤0.2%, Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.15%, and the balance Cu. This invention utilizes the addition of nickel and copper to form an infinitely soluble continuous solid solution, which improves the alloy's strength and corrosion resistance. Simultaneously, nickel and tin undergo modulated decomposition, significantly enhancing the physical properties and wear resistance of the copper alloy. Iron inhibits the nucleation and growth of discontinuous precipitates, significantly improving the alloy's strength and plasticity. Manganese increases the softening temperature of copper, improving its mechanical properties. Adding Mn to the copper alloy has a deoxidizing effect, refining the as-cast grain structure, inhibiting grain boundary reactions and grain coarsening, and delaying the precipitation of discontinuous precipitates, thus further improving the copper alloy's strength. Adding a small amount of Zn inhibits the nucleation and growth of discontinuous precipitates, significantly improving... The alloy's strength and plasticity are improved. Magnesium promotes the complete precipitation of precipitated phases, and magnesium atoms dissolved in the alloy matrix can drag dislocations, improving the alloy's resistance to stress relaxation and thus improving its machining accuracy. Trace amounts of phosphorus act as a good deoxidizer for copper alloys, and phosphides have good abrasiveness, high hardness, and wear resistance, improving the strength, hardness, and wear resistance of copper-nickel-tin alloys. Trace amounts of silicon can react with Ni elements remaining after the decomposition of copper-nickel-tin alloys to form Ni3Si, improving the strength, conductivity, and wear resistance of copper alloys. By optimizing the chemical composition of copper-nickel-tin alloys and utilizing the synergistic effects of various elements, the wear and corrosion resistance of copper alloys are further improved. The results of the examples show that the tensile strength of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by the present invention is 687-736 MPa, the yield strength is 574-680 MPa, and the elongation is A. 50 The carbon content is 15.5%–17.5%, the hardness is 201–223 HV, the conductivity is >11.7% IACS, and the copper alloy also has excellent wear resistance and corrosion resistance. Attached Figure Description

[0023] Figure 1 This is a photograph of the nickel-tin wear-resistant and corrosion-resistant copper alloy prepared in Example 1 of the present invention.

[0024] Figure 2 A physical image of the tin-phosphorus bronze QSn8-0.3 provided for Comparative Example 1;

[0025] Figure 3 This is a photograph of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided in Embodiment 1 of the present invention after a 24-hour salt spray test.

[0026] Figure 4The image shows the tin-phosphorus bronze QSn8-0.3 provided for Comparative Example 1 after a 24-hour salt spray test. Detailed Implementation

[0027] This invention provides a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, which, by mass percentage, comprises the following chemical composition: Ni: 8.7-10.0%, Sn: 2.0-6.5%, Fe≤0.6%, Mn≤0.2%, Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si≤0.15%, and the balance Cu.

[0028] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention comprises Ni: 8.7-10.0%, preferably 9.0-9.5%, by weight percentage. In this invention, nickel and copper can form an infinitely solid solution, which can improve the alloy's strength and corrosion resistance.

[0029] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention comprises Sn: 2.0-6.5%, preferably 2.5-6.3%, by weight percentage. In this invention, nickel and tin can undergo modulated decomposition, thereby significantly improving the physical properties and wear resistance of the copper alloy.

[0030] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, comprises Fe ≤ 0.6%, preferably ≤ 0.5%, and more preferably 0.2–0.4%. In this invention, iron can inhibit the nucleation and growth of discontinuous precipitates in the alloy, significantly improving the strength and plasticity of the alloy. However, when the iron content is high, it will reduce the plasticity of the alloy, leading to processing difficulties. Therefore, its content is controlled within the range of ≤ 0.6%.

[0031] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, comprises Mn ≤ 0.2%, preferably 0.08–0.12%. In this invention, manganese can increase the softening temperature of copper and improve its mechanical properties; by adding Mn to the copper alloy, it has a deoxidizing effect, which can refine the as-cast grain structure, inhibit grain boundary reactions and grain coarsening, and delay the precipitation of discontinuous precipitates, thereby further improving the strength of the copper alloy.

[0032] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, contains Zn ≤ 0.5%, preferably 0.1–0.5%, and more preferably 0.2–0.4%. In this invention, the addition of a small amount of Zn can suppress the nucleation and growth of discontinuous precipitates in the alloy, and can significantly improve the strength and plasticity of the alloy. However, when the Zn content is high, it will reduce the plasticity of the alloy, leading to processing difficulties. Therefore, its content is controlled within the range of ≤ 0.5%.

[0033] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, comprises Mg ≤ 0.05%, preferably 0.01–0.05%, and more preferably 0.02–0.04%. In this invention, magnesium can promote the complete precipitation of the precipitated phase. At the same time, magnesium atoms dissolved in the alloy matrix can drag dislocations, improve the alloy's resistance to stress relaxation, and thus improve the alloy's machining accuracy.

[0034] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention contains P ≤ 0.05% by weight. By adding trace amounts of phosphorus, this invention can act as a good deoxidizer for copper alloys, and phosphides possess good abrasiveness, high hardness, and wear resistance, thereby improving the strength, hardness, wear resistance, and other properties of copper-nickel-tin alloys.

[0035] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention, by mass percentage, contains Si ≤ 0.15%, preferably ≤ 0.12%, and more preferably ≤ 0.10%. By adding trace amounts of silicon, this invention can react with the Ni element remaining after amplitude modulation decomposition in the copper-nickel-tin alloy to form Ni3Si, thereby improving the strength, conductivity, and wear resistance of the copper alloy.

[0036] The copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by this invention comprises the balance Cu by weight percentage. In this invention, copper is the base element of the alloy.

[0037] This invention utilizes the addition of nickel and copper to form an infinitely soluble continuous solid solution, which improves the alloy's strength and corrosion resistance. Simultaneously, nickel and tin undergo modulated decomposition, significantly enhancing the physical properties and wear resistance of the copper alloy. Iron inhibits the nucleation and growth of discontinuous precipitates in the alloy, significantly improving its strength and plasticity. Manganese increases the softening temperature of copper, improving its mechanical properties. Adding Mn to the copper alloy has a deoxidizing effect, refining the as-cast grain structure, inhibiting grain boundary reactions and grain coarsening, and delaying the precipitation of discontinuous precipitates, thereby further improving the strength of the copper alloy. Adding a small amount of Zn can suppress… The nucleation and growth of discontinuous precipitates in the alloy can significantly improve its strength and plasticity. Magnesium can promote the complete precipitation of precipitates, and the magnesium atoms dissolved in the alloy matrix can drag dislocations, improving the alloy's resistance to stress relaxation and thus improving its machining accuracy. Trace amounts of phosphorus can act as a good deoxidizer for copper alloys, and phosphides have good grindability, high hardness, and wear resistance, which can improve the strength, hardness, and wear resistance of copper-nickel-tin alloys. Trace amounts of silicon can react with Ni remaining after the decomposition of silicon in copper-nickel-tin alloys to form Ni3Si, which can improve the strength, conductivity, and wear resistance of copper alloys. This invention optimizes the chemical composition of copper-nickel-tin alloys and utilizes the synergistic effect of each element to further improve the wear and corrosion resistance of copper alloys.

[0038] This invention also provides a method for preparing the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy described in the above technical solution, comprising the following steps:

[0039] (1) The alloy raw materials are sequentially melted, horizontally continuously cast and milled to obtain a cast billet;

[0040] (2) The billet obtained in step (1) is subjected to bell-type annealing to obtain the first annealed strip;

[0041] (3) The first annealed strip obtained in step (2) is subjected to initial rolling to obtain an initial rolled strip;

[0042] (4) The initial rolled strip obtained in step (3) is continuously annealed to obtain the second annealed strip;

[0043] (5) The second annealed strip obtained in step (4) is precision rolled to obtain a precision rolled strip;

[0044] (6) The finely rolled strip obtained in step (5) is subjected to low-temperature annealing to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy.

[0045] This invention involves sequentially melting, horizontally casting, and milling alloy raw materials to obtain a cast billet.

[0046] This invention does not specifically limit the type and source of the alloy raw materials; high-purity metals or recycled waste can be used, as long as the chemical composition of the cast billet meets the requirements of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy. In this invention, the recycled waste preferably includes milling and rolling waste generated during the preparation of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy; the amount of recycled waste is preferably more than 50 wt% of the total alloy raw materials. This invention uses recycled waste as the alloy raw material. Since the recycled waste consists of milling and rolling waste generated during the preparation of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, its composition is controllable. This not only ensures that the chemical composition of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy meets the requirements, but also enables the reuse of waste, saving significant production costs.

[0047] The present invention does not impose any special limitations on the specific temperature and time of the melting process; these can be determined based on the technical common sense of those skilled in the art.

[0048] In this invention, the preferred temperature for horizontal continuous casting is 1150–1200°C. This invention does not impose any specific limitations on the actual operation of the horizontal continuous casting; it can be determined based on the technical knowledge of those skilled in the art.

[0049] In this invention, the thickness of the milled surface is preferably 1.0–2.0 mm / surface, more preferably 1.5 mm / surface. This invention eliminates segregation layers and oxide layers through milling.

[0050] After obtaining the cast billet, the present invention performs bell-type annealing on the cast billet to obtain the first annealed strip.

[0051] In this invention, the preferred temperature for bell-type annealing is 750–850°C, more preferably 800°C; the preferred holding time for bell-type annealing is 6–10 h, more preferably 6–8 h; and the preferred cooling method for bell-type annealing is water quenching. This invention achieves recrystallization and eliminates Sn element segregation inside the cast billet through bell-type annealing.

[0052] After obtaining the first annealed strip, the present invention performs initial rolling on the first annealed strip to obtain the initial rolled strip.

[0053] In this invention, the total deformation of the initial rolling is preferably 85-95%, more preferably 88-92%; the deformation per pass of the initial rolling is preferably 5-20%, more preferably 6-15%. This invention, through multi-pass rolling with large deformation, can break up coarse grains in the casting state, significantly heal cracks, reduce or eliminate casting defects, transform the as-cast structure into a deformed structure, and improve the alloy's machinability.

[0054] After obtaining the initial rolled strip, the present invention performs continuous annealing on the initial rolled strip to obtain the second annealed strip.

[0055] In this invention, the temperature of the continuous annealing is preferably 950–1000℃, more preferably 970–1000℃; the rate of the continuous annealing is preferably 1.0–2.5 m / min, more preferably 1.5–2.0 m / min. This invention, through continuous annealing, can eliminate the internal stress of copper alloys caused by rolling, improve the alloy's plasticity, and thus prevent problems such as cracking during subsequent rolling processes. Simultaneously, it can also play a homogenization role, making the internal structure of the alloy more uniform.

[0056] After obtaining the second annealed strip, the present invention performs precision rolling on the second annealed strip to obtain precision rolled strip.

[0057] In this invention, the total deformation of the finishing rolling is preferably 20-30%, more preferably 25-30%; the deformation per pass of the finishing rolling is preferably 2-15%, more preferably 5-7%. This invention, through finishing rolling, enables the sheet and strip material to achieve the required thickness.

[0058] After obtaining the precision-rolled strip, the present invention performs low-temperature annealing on the precision-rolled strip to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy.

[0059] In this invention, the temperature of the low-temperature annealing treatment is preferably 350–400°C; the duration of the low-temperature annealing treatment is preferably 6–10 hours, more preferably 8–10 hours. By performing a final low-temperature annealing treatment, this invention can generate a modulated decomposition structure, thereby significantly improving the physical properties of the copper alloy.

[0060] The preparation method provided by this invention is simple, easy to control parameters, low in cost, and suitable for large-scale industrial production.

[0061] The technical solutions of this invention will be clearly and completely described below with reference to the embodiments thereof. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0062] Example 1

[0063] A copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, comprising the following chemical composition by mass percentage: Ni: 8.9%, Sn: 6.2%, Fe: 0.4%, Mn: 0.12%, Zn: 0.3%, Mg: 0.02%, P: 0.03%, Si: 0.12%, and balance Cu;

[0064] The preparation method of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy specifically includes the following steps:

[0065] (1) The alloy raw materials are sequentially melted, horizontally continuously cast and milled to obtain a casting billet; the temperature of the horizontal continuous casting is 1150℃; the thickness of the milled surface is 1.0mm / surface;

[0066] (2) The billet obtained in step (1) is subjected to bell-type annealing to obtain the first annealed strip; the temperature of the bell-type annealing is 780℃, the holding time of the bell-type annealing is 8h, and the cooling method of the bell-type annealing is water quenching.

[0067] (3) The first annealed strip obtained in step (2) is subjected to initial rolling to obtain an initial rolled strip; the total deformation of the initial rolling is 91%; the deformation per pass of the initial rolling is 7%;

[0068] (4) The initial rolled strip obtained in step (3) is continuously annealed to obtain a second annealed strip; the continuous annealing temperature is 980℃ and the continuous annealing rate is 2.0m / min.

[0069] (5) The second annealed strip obtained in step (4) is precision rolled to obtain a precision rolled strip; the total deformation of the precision rolling is 25%, and the deformation per pass of the precision rolling is 5%;

[0070] (6) The finely rolled strip obtained in step (5) is subjected to low-temperature annealing to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy; the temperature of the low-temperature annealing is 350℃; the time of the low-temperature annealing is 8h.

[0071] Figure 1 This is a photograph of the nickel-tin wear-resistant and corrosion-resistant copper alloy prepared in Example 1.

[0072] Example 2

[0073] A copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, comprising the following chemical composition by mass percentage: Ni: 9.6%, Sn: 2.5%, Fe: 0.3%, Mn: 0.08%, Zn: 0.2%, Mg: 0.05%, P: 0.04%, Si: 0.10%, and balance Cu;

[0074] The preparation method of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy is the same as that in Example 1.

[0075] Example 3

[0076] A copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, comprising the following chemical composition by mass percentage: Ni: 9.2%, Sn: 2.0%, Fe: 0.6%, Mn: 0.2%, Zn: 0.1%, Mg: 0.05%, P: 0.04%, Si: 0.08%, and balance Cu;

[0077] The preparation method of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy is the same as that in Example 1.

[0078] Comparative Example 1

[0079] A tin-phosphorus bronze QSn8-0.3, by mass percentage, is composed of the following chemical composition: Sn: 8.0%, P: 0.031%, Fe: 0.017%, Zn: 0.08%, Ni: 0.065%, and balance Cu;

[0080] The preparation method of the copper-iron alloy is the same as that in Example 1.

[0081] Figure 2 A physical image of the tin-phosphorus bronze QSn8-0.3 provided for Comparative Example 1.

[0082] The mechanical properties of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloys provided in Examples 1-3 and the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1 were tested, and the results are shown in Table 1:

[0083] Table 1 shows the mechanical properties of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloys provided in Examples 1-3 and the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1.

[0084] Tensile strength / MPa Yield strength / MPa Hardness / HV <![CDATA[Elongation A 50 / %]]> Conductivity / % IACS Example 1 736 680 223 17.5 19.42 Example 2 691 574 217 17.0 11.86 Example 3 687 668 201 15.5 11.77 Comparative Example 1 600 521 185 15.0 10.28

[0085] The test methods for tensile strength, yield strength, and elongation are: GB / T 34505-2017 Tensile Test at Room Temperature;

[0086] The specific test method for hardness is: GB / T4340.1-2009 Vickers hardness test for metallic materials;

[0087] The test method for conductivity is: YS / T 478-2005 Conductivity Eddy Current Test Method.

[0088] As can be seen from Table 1, the tensile strength, yield strength and hardness of the copper alloy provided by the present invention are improved compared with the existing tin-phosphorus bronze QSn8-0.3, indicating that the copper alloy provided by the present invention has excellent mechanical properties, and the electrical conductivity of the copper alloy is also improved.

[0089] The wear resistance of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloys provided in Examples 1-3 and the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1 were tested. The test conditions and results are shown in Table 2.

[0090] Table 2 shows the wear resistance of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloys provided in Examples 1-3 and the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1.

[0091]

[0092] As can be seen from Table 2, the wear resistance of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by the present invention is significantly improved compared with the existing tin-phosphorus bronze alloy.

[0093] The corrosion resistance of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided in Example 1 and the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1 were tested using a 24-hour salt spray test. The results were obtained respectively. Figure 3 and Figure 4 ,in, Figure 3 This is a photograph of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided in Example 1 after a 24-hour salt spray test. Figure 4 A photograph of the tin-phosphorus bronze QSn8-0.3 provided for Comparative Example 1 after a 24-hour salt spray test. Figures 1-4The comparison shows that after 24 hours of salt spray testing, the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided in Example 1 still shows the original luster and texture of the copper sheet, and the black substance on it is the attached sodium chloride. In contrast, the surface of the tin-phosphorus bronze QSn8-0.3 provided in Comparative Example 1 is completely oxidized, indicating that the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy provided by the present invention has better corrosion resistance.

[0094] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A copper-nickel-tin wear-resistant and corrosion-resistant copper alloy, comprising the following chemical components by mass percentage: Ni: 8.7~10.0%, Sn: 2.0~6.5%, Fe: 0.3~0.6%, Mn≤0.2%; Zn≤0.5%, Mg≤0.05%, P≤0.05%, Si: 0.1~0.15% and balance Cu; The preparation method of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy includes the following steps: (1) The alloy raw materials are successively smelted, horizontally continuously cast and milled to obtain a cast billet; (2) The billet obtained in step (1) is subjected to bell-type annealing to obtain the first annealed strip; (3) The first annealed strip obtained in step (2) is subjected to initial rolling to obtain an initial rolled strip; (4) The initial rolled strip obtained in step (3) is continuously annealed to obtain the second annealed strip; (5) The second annealed strip obtained in step (4) is precision rolled to obtain a precision rolled strip; (6) The finely rolled strip obtained in step (5) is subjected to low-temperature annealing to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy; In step (2), the temperature of bell annealing is 750~850℃, and the holding time of bell annealing is 6~10h. In step (4), the continuous annealing temperature is 950~1000℃ and the continuous annealing rate is 1.0~2.5m / min; In step (6), the temperature of the low-temperature annealing treatment is 350~400℃, and the time of the low-temperature annealing treatment is 6~10h.

2. The preparation method of the copper-nickel-tin wear-resistant and corrosion-resistant copper alloy according to claim 1, comprising the following steps: (1) The alloy raw materials are successively smelted, horizontally continuously cast and milled to obtain a cast billet; (2) The billet obtained in step (1) is subjected to bell-type annealing to obtain the first annealed strip; (3) The first annealed strip obtained in step (2) is subjected to initial rolling to obtain an initial rolled strip; (4) The initial rolled strip obtained in step (3) is continuously annealed to obtain the second annealed strip; (5) The second annealed strip obtained in step (4) is precision rolled to obtain a precision rolled strip; (6) The finely rolled strip obtained in step (5) is subjected to low-temperature annealing to obtain a copper-nickel-tin wear-resistant and corrosion-resistant copper alloy; In step (2), the temperature of bell annealing is 750~850℃, and the holding time of bell annealing is 6~10h. In step (4), the continuous annealing temperature is 950~1000℃ and the continuous annealing rate is 1.0~2.5m / min; In step (6), the temperature of the low-temperature annealing treatment is 350~400℃, and the time of the low-temperature annealing treatment is 6~10h.

3. The preparation method according to claim 2, characterized in that, The temperature of horizontal continuous casting in step (1) is 1150~1200℃.

4. The preparation method according to claim 2, characterized in that, In step (3), the total deformation of the initial rolling is 85-95%, and the deformation per pass of the initial rolling is 5-20%.

5. The preparation method according to claim 2, characterized in that, In step (5), the total deformation of the finishing rolling is 20-30%, and the deformation of a single pass of the finishing rolling is 2-15%.

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