Reed with good durability and preparation method thereof

Abstract

The invention discloses a reed with good durability and a preparation method thereof, and relates to the technical field of reeds. The preparation method of the reed with good durability comprises the following steps: taking raw materials, smelting the raw materials in an argon atmosphere, and casting and cooling the raw materials to obtain a cast ingot; the cast ingot is subjected to homogenization treatment, surface milling is conducted after furnace cooling, and then blooming is conducted; annealing is carried out after primary rolling, finish rolling is carried out, a thin strip is obtained, stamping cutting and annealing are carried out, and a rough reed is obtained; the rough reed is taken, cleaned, dried and polished and then placed in a passivation solution to be soaked, and the finished reed is obtained; the passivation solution comprises the following raw materials in percentage by mass: 1-4% of benzotriazole, 0.3-0.5% of a surfactant, 2-5% of a corrosion inhibitor, 12-15% of phytic acid, 1-2% of citric acid, 2-5% of ethanol and the balance of deionized water. The finally prepared reed has a hydrophobic surface and good corrosion resistance.

Description

A durable reed and its preparation method Technical Field

[0001] This invention relates to the field of reed technology, specifically a durable reed and its preparation method. Background Technology

[0002] As the core sound-producing element of wind instruments and free-reed instruments (such as the melodica, harmonica, clarinet, and saxophone), the reed's performance directly determines the instrument's timbre, intonation stability, response sensitivity, and lifespan. High-performance reeds must simultaneously possess excellent acoustic characteristics, outstanding mechanical durability, and corrosion resistance in humid, organic-rich oral environments. Currently, the materials used to manufacture instrument reeds are mainly copper alloys, especially tin-phosphor bronze. These materials are widely used in the industry due to their good elasticity, moderate damping characteristics, and relatively easy processing. Traditional reed manufacturing processes typically involve stamping standard alloy strips, followed by simple cleaning, polishing, and surface rust prevention treatment (such as passivation with benzotriazole), and finally, manual tuning by experienced technicians. However, with the increasing diversity of instrument playing environments and the ever-increasing demands on instrument performance and durability, there is an urgent need for a more durable reed to improve its environmental durability and meet the increasingly stringent requirements of high-performance instruments for their core components. Summary of the Invention

[0003] The purpose of this invention is to provide a durable reed and its preparation method to solve the problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a method for preparing a reed with good durability, comprising the following steps: S1: taking raw materials, melting them under an argon atmosphere, casting and cooling them to obtain an ingot; S2: homogenizing the ingot, cooling it in the furnace and then milling the surface, and then performing initial rolling; S3: annealing after initial rolling, and then performing fine rolling to obtain a thin strip, which is then stamped and cut, and annealed to obtain a rough reed; S4: taking the rough reed, cleaning, drying and polishing it, and then immersing it in a passivation solution to obtain a finished reed.

[0005] Preferably, the melting process parameters in S1 are: the output power is 12.5-13.5KW until the raw material melts, then the output power is reduced to 10-12KW and held for 8-12 minutes; the melting is carried out in an induction melting furnace; preferably, the homogenization process parameters in S2 are: the temperature is 650-700℃ and the holding time is 5-10h; preferably, the initial rolling rate in S2 is 72-80%; the thickness after milling is 3.00-4.00mm.

[0006] Preferably, the annealing process parameters in S3 are: temperature 450-500℃, holding time 3-4h, and air cooling; preferably, the finishing rolling process parameters in S3 are: the rolling rate of the first rolling is 50-55%, the first intermediate annealing temperature is 440-460℃, and the holding time is 2-3h; the rolling rate of the second rolling is 45-48%, the second intermediate annealing temperature is 600-700℃, and the holding time is 30-120s; the rolling rate of the third rolling is 40-45%, the third intermediate annealing temperature is 600-650℃, and the holding time is 4-6min; the rolling rate of the fourth rolling is 35-40%, the fourth intermediate annealing temperature is 600-700℃, and the holding time is 45-60s.

[0007] Preferably, the annealing temperature after stamping is 280-300℃, and the holding time is 30-50 min; preferably, the chemical composition of the rough reed in S3 is: by mass percentage, 7.2-7.6% Sn, 0.15-0.20% P, 0.08-0.1% Ni, 0.2-0.25% Si, 0.1-0.3% Ti, and the balance is Cu; preferably, the polishing process parameters in S4 are: electropolishing in phosphoric acid at a voltage of 4V relative to a titanium electrode for 1-3 min, Rinse and dry; preferably, the process parameters for the passivation solution are: immersion time of 20-30 min and immersion temperature of 55-60℃; preferably, the passivation solution in S4 includes the following raw materials by mass percentage: 1-4% benzotriazole, 0.3-0.5% surfactant, 2-5% corrosion inhibitor, 12-15% phytic acid, 1-2% citric acid, 2-5% ethanol, and the balance being deionized water; preferably, the surfactant is composed of cationic surfactant and nonionic surfactant.

[0008] Preferably, the corrosion inhibitor is composed of an oleic acid imidazoline derivative and 2-benzothiazol-6-methoxyphenol in a mass ratio of (1-3):1; preferably, the preparation steps of the oleic acid imidazoline derivative are as follows: oleic acid imidazoline, mercaptoethanol, and a photoinitiator are reacted under a light intensity of 800-1000W for 30-40 minutes to obtain hydroxylated oleic acid imidazoline; hydroxylated oleic acid imidazoline is then reacted with 3-trifluoromethyl groups under a nitrogen atmosphere. Cinnamic acid, a condensing agent, a catalyst, and a solvent are reacted for 24 hours, followed by washing and sedimentation to obtain an oleic acid-based imidazoline derivative. More preferably, the raw materials for the hydroxylated oleic acid imidazoline are: 2-3 parts by mass of oleic acid imidazoline, 1-1.5 parts by mass of mercaptoethanol, and 0.06-0.09 parts by mass of a photoinitiator; the raw materials for the oleic acid imidazoline derivative are: 1-2 parts by mass of hydroxylated oleic acid imidazoline and 1.5-4 parts by mass of 3-trifluoromethylcinnamic acid.

[0009] A durable reed is prepared according to the above preparation method.

[0010] Compared with existing technologies, the beneficial effects achieved by this invention are as follows: This invention uses an alloy with a specific alloy composition, combined with processes such as homogenization, precision rolling, and annealing, to form a coarse spring sheet with refined grains and uniform internal stress distribution. The addition of Ni and Si improves the alloy's strength and recrystallization temperature, while the addition of Ti refines the grains. Through the joint design of materials and processes, the spring sheet substrate is endowed with good initial stability. The coarse spring sheet is then washed, polished, and passivated to form a hydrophobic protective film on the spring sheet surface, thereby improving the product's performance. Durability: The corrosion inhibitor in the passivation solution is a compound of oleic acid imidazoline derivative and 2-benzothiazol-6-methoxyphenol. The oleic acid imidazoline derivative introduces 3-trifluoromethylcinnamic acid through click reaction and condensation, constructing long-chain alkyl, imidazoline and benzothiazol groups adsorbed on the alloy surface. It is then compounded with other components to form a hydrophobic and corrosion-resistant passivation film on the copper alloy surface through multi-component synergistic effect. The adhesion of the passivation film is also improved, thereby enhancing the protection of the alloy substrate and improving the durability of the spring. Detailed Implementation

[0011] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] It should be noted that the following proportions are by weight. There are no special restrictions on the suppliers of any of the raw materials involved in this invention. Exemplarily, the chemical composition of the crude reed in S3 is: by mass percentage, 7.47% Sn, 0.18% P, 0.085% Ni, 0.23% Si, 0.2% Ti, and the balance Cu; the preparation steps of the oleic acid imidazoline derivative are as follows: oleic acid imidazoline, mercaptoethanol, and a photoinitiator are reacted under 1000W light intensity for 40 minutes to obtain hydroxylated oleic acid imidazoline; hydroxylated oleic acid imidazoline is then reacted with 3-trifluoromethylcinnamic acid under a nitrogen atmosphere. The reaction mixture, consisting of a condensing agent, a catalyst, and a solvent, was washed and allowed to settle after 24 hours to obtain an oleic acid-based imidazoline derivative. The photoinitiator was 2-hydroxy-2-methyl-1-phenyl-1-propanone; the condensing agent was dicyclohexylcarbodiimide; the catalyst was 4-dimethylaminopyridine; and the solvent was dichloromethane. The raw materials for the hydroxylated oleic acid imidazoline were: by mass, 2 parts oleic acid-based imidazoline, 1.5 parts mercaptoethanol, and 0.07 parts photoinitiator; the raw materials for the oleic acid-based imidazoline derivative were: by mass, 1 part hydroxylated oleic acid imidazoline, 4 parts 3-trifluoromethylcinnamic acid, 0.35 parts condensing agent, 0.12 parts catalyst, and 20 parts solvent.

[0013] In the following examples, parts refer to parts by weight, and all raw materials mentioned above and others not mentioned are commercially available.

[0014] Example 1: This example provides a method for preparing a reed, including the following steps: S1: Take raw materials, place them in an induction melting furnace under an argon atmosphere, and after the raw materials melt, reduce the output power to 10KW and hold for 10 minutes, then cast and cool to obtain an ingot; S2: Homogenize the ingot, hold it at 650℃ for 6 hours, cool it in the furnace, and then mill the surface to obtain a thickness of 4mm, and then perform initial rolling with a rolling rate of 75%; S3: Anneal after initial rolling, hold it at 450℃ for 3 hours, air cool it, and then perform fine rolling to obtain a thin strip, perform stamping and cutting, and anneal at 280℃ for 30 minutes to obtain a rough reed; S4: After cleaning and drying the rough reed, it is electropolished in 85% phosphoric acid at 4V relative to a titanium electrode for 2 minutes. After rinsing and drying, it is immersed in a passivation solution at 55℃ for 20 minutes to obtain the finished reed. The process parameters for S3 finishing rolling are as follows: the rolling rate of the first rolling is 53%, the first intermediate annealing temperature is 450℃, and the holding time is 2 hours; the rolling rate of the second rolling is 46%, the second intermediate annealing temperature is 600℃, and the holding time is 80 seconds; the rolling rate of the third rolling is 43%, the third intermediate annealing temperature is 650℃, and the holding time is 5 minutes; the rolling rate of the fourth rolling is 37%, the fourth intermediate annealing temperature is 600℃, and the holding time is 45 seconds.

[0015] The passivation solution in S4 comprises the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 2% corrosion inhibitor, 12% phytic acid, 2% citric acid, 5% ethanol, and the balance being deionized water; the corrosion inhibitor is composed of oleic acid-based imidazoline derivative and 2-benzothiazole-6-methoxyphenol in a mass ratio of 1:1; the surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0016] Example 2: This example provides a method for preparing a reed, including the following steps: S1: Take raw materials, place them in an induction melting furnace under an argon atmosphere, and after the raw materials melt at an output power of 13KW, reduce the output power to 12KW and hold for 10 minutes, then cast and cool to obtain an ingot; S2: Homogenize the ingot, hold it at 700℃ for 5 hours, cool it in the furnace, mill the surface to obtain a thickness of 4mm, and then perform initial rolling with a rolling rate of 75%; S3: Anneal after initial rolling, hold at 500℃ for 3 hours, air cool, and then perform fine rolling to obtain a thin strip, perform stamping and cutting, and anneal at 300℃ for 40 minutes to obtain a rough reed; 4. After cleaning and drying the rough reed, electropolish it for 2 minutes at 4V relative to a titanium electrode in 85% phosphoric acid. After rinsing and drying, immerse it in a passivation solution at 60℃ for 20 minutes to obtain the finished reed. The process parameters for S3 finishing rolling are as follows: the rolling rate of the first rolling is 53%, the first intermediate annealing temperature is 440℃, and the holding time is 3h; the rolling rate of the second rolling is 46%, the second intermediate annealing temperature is 700℃, and the holding time is 40s; the rolling rate of the third rolling is 43%, the third intermediate annealing temperature is 650℃, and the holding time is 5min; the rolling rate of the fourth rolling is 37%, the fourth intermediate annealing temperature is 600℃, and the holding time is 60s.

[0017] The passivation solution in S4 comprises the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 3% corrosion inhibitor, 12% phytic acid, 1% citric acid, 5% ethanol, and the balance being deionized water; the corrosion inhibitor is composed of oleic acid-based imidazoline derivative and 2-benzothiazole-6-methoxyphenol in a mass ratio of 2:1; the surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0018] Example 3: This example provides a method for preparing a reed, including the following steps: S1: Take raw materials, place them in an induction melting furnace under an argon atmosphere, output power of 12.5KW until the raw materials melt, reduce the output power to 10KW and hold for 12 minutes, then cast and cool to obtain an ingot; S2: Homogenize the ingot, hold it at 700℃ for 6 hours, cool it in the furnace and then mill the surface to obtain a thickness of 4mm, then perform initial rolling with a rolling rate of 75%; S3: Anneal after initial rolling, hold at 475℃ for 4 hours, air cool and then perform fine rolling to obtain a thin strip, perform stamping and cutting, and anneal at 300℃ for 30 minutes to obtain a rough reed; S4: After cleaning and drying the rough reed, it is electropolished in 85% phosphoric acid at 4V relative to a titanium electrode for 2 minutes. After rinsing and drying, it is immersed in a passivation solution at 60℃ for 30 minutes to obtain the finished reed. The process parameters for S3 finishing rolling are as follows: the rolling rate of the first rolling is 53%, the first intermediate annealing temperature is 450℃, and the holding time is 3h; the rolling rate of the second rolling is 46%, the second intermediate annealing temperature is 600℃, and the holding time is 80s; the rolling rate of the third rolling is 43%, the third intermediate annealing temperature is 650℃, and the holding time is 4min; the rolling rate of the fourth rolling is 37%, the fourth intermediate annealing temperature is 700℃, and the holding time is 45s.

[0019] The passivation solution in S4 comprises the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 3% corrosion inhibitor, 12% phytic acid, 1% citric acid, 5% ethanol, and the balance being deionized water; the corrosion inhibitor is composed of oleic acid-based imidazoline derivative and 2-benzothiazole-6-methoxyphenol in a mass ratio of 2:1; the surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0020] Comparative Example 1: As a control experiment for Example 2, the difference is that the finishing rolling in S3 was adjusted to a conventional process, including the following steps: S1: Take the raw material, place it in an induction melting furnace under an argon atmosphere, and after the raw material melts at an output power of 13KW, reduce the output power to 12KW and hold for 10 minutes, then cast and cool to obtain an ingot; S2: Homogenize the ingot, hold it at 700℃ for 5 hours, cool it in the furnace, and then mill the surface to obtain a thickness of 4mm, followed by initial rolling with a rolling rate of 75%; S3: Anneal after initial rolling, hold it at 500℃ for 3 hours, air cool it, and then cold roll it to obtain a thin strip, which is then stamped and cut, and annealed at 300℃ for 40 minutes to obtain a rough spring sheet; S4: Take the rough spring sheet, clean and dry it, and then... In phosphoric acid with a concentration of 85%, the reed is electropolished at 4V relative to a titanium electrode for 2 minutes, rinsed and dried, and then immersed in a passivation solution at 60℃ for 20 minutes to obtain the finished reed. The process parameters for S3 cold rolling are as follows: the rolling rate of the first rolling is 75%, the first intermediate annealing temperature is 450℃, and the holding time is 3 hours; the rolling rate of the second rolling is 84%. The passivation solution in S4 includes the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 3% corrosion inhibitor, 12% phytic acid, 1% citric acid, 5% ethanol, and the balance is deionized water. The corrosion inhibitor is composed of oleic acid-based imidazoline derivative and 2-benzothiazole-6-methoxyphenol in a mass ratio of 2:1. The surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0021] Comparative Example 2: As a control experiment for Example 2, the difference is that the corrosion inhibitor was replaced with 2-benzothiazole-6-methoxyphenol; the following steps were included: S1: Raw materials were taken and placed in an induction melting furnace under an argon atmosphere. The output power was 13KW until the raw materials melted. After melting, the output power was reduced to 12KW and held for 10 minutes. The ingot was then cast and cooled to obtain an ingot; S2: The ingot was homogenized and held at 700℃ for 5 hours. After furnace cooling, the surface was milled to obtain a thickness of 4mm. Then, it was initially rolled with a rolling rate of 75%; S3: After initial rolling, the ingot was annealed at 500℃ for 3 hours, air-cooled, and then finished rolled to obtain a thin strip. The strip was then stamped and cut at 300℃ for 40 minutes. S4: After cleaning and drying the rough reed, it is electropolished in 85% phosphoric acid at 4V relative to a titanium electrode for 2 minutes. After rinsing and drying, it is immersed in a passivation solution at 60℃ for 20 minutes to obtain the finished reed. The process parameters of S3 finishing rolling are as follows: the rolling rate of the first rolling is 53%, the first intermediate annealing temperature is 440℃, and the holding time is 3h; the rolling rate of the second rolling is 46%, the second intermediate annealing temperature is 700℃, and the holding time is 40s; the rolling rate of the third rolling is 43%, the third intermediate annealing temperature is 650℃, and the holding time is 5min; the rolling rate of the fourth rolling is 37%, the fourth intermediate annealing temperature is 600℃, and the holding time is 60s.

[0022] The passivation solution in S4 comprises the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 3% 2-benzothiazole-6-methoxyphenol, 12% phytic acid, 1% citric acid, 5% ethanol, and the balance being deionized water; the surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0023] Comparative Example 3: As a control experiment of Example 2, the difference is that the oleic acid imidazoline derivative in the corrosion inhibitor was replaced with oleic acid imidazoline; including the following steps: S1: Take the raw material, place it in an induction melting furnace under an argon atmosphere, and after the output power is 13KW until the raw material melts, reduce the output power to 12KW and hold for 10 minutes, then cast and cool to obtain an ingot; S2: Homogenize the ingot, hold it at 700℃ for 5 hours, cool it in the furnace and then mill the surface to obtain a thickness of 4mm, then perform initial rolling with a rolling rate of 75%; S3: Anneal after initial rolling, hold at 500℃ for 3 hours, air cool and then perform fine rolling to obtain a thin strip, perform stamping and cutting, hold at 300℃ for 40 minutes. S4: After cleaning and drying the rough reed, it is electropolished in 85% phosphoric acid at 4V relative to a titanium electrode for 2 minutes. After rinsing and drying, it is immersed in a passivation solution at 60℃ for 20 minutes to obtain the finished reed. The process parameters for S3 finishing rolling are as follows: the rolling rate of the first rolling is 53%, the first intermediate annealing temperature is 440℃, and the holding time is 3h; the rolling rate of the second rolling is 46%, the second intermediate annealing temperature is 700℃, and the holding time is 40s; the rolling rate of the third rolling is 43%, the third intermediate annealing temperature is 650℃, and the holding time is 5min; the rolling rate of the fourth rolling is 37%, the fourth intermediate annealing temperature is 600℃, and the holding time is 60s.

[0024] The passivation solution in S4 comprises the following raw materials by mass percentage: 3% benzotriazole, 0.3% surfactant, 3% corrosion inhibitor, 12% phytic acid, 1% citric acid, 5% ethanol, and the balance being deionized water; the corrosion inhibitor is composed of oleic acid imidazoline and 2-benzothiazol-6-methoxyphenol in a mass ratio of 2:1; the surfactant is composed of nonylphenol polyoxyethylene ether-10 and quaternary ammonium salt QAS 1622 in a mass ratio of 1:2.

[0025] Performance Testing: 1. The finished reeds were measured using a contact angle meter, and the data were recorded in Table 1; 2. Neutral Salt Spray Resistance Test: Referring to GB / T 10125, a 5% sodium chloride solution was used, the chamber temperature was 35℃, the salt spray deposition rate was 2mL / h, and continuous spraying was performed for 12h. The appearance of the reeds was recorded; pitting or large-area corrosion was considered unqualified; 3. Electrochemical Testing: An electrochemical workstation was used with a three-electrode system, using an AgCl electrode as the reference electrode and a platinum electrode as the counter electrode. The electrolyte was a 3.5% sodium chloride solution. The measurement potential range was set to -0.5~0.5V, and the scan rate was 2mV / s. The corrosion inhibition efficiency was calculated, and the data were recorded in Table 1; Table 1

[0026] Conclusion: As can be seen from the above data, Example 2 achieves better passivation film corrosion resistance than the other examples; Comparative Example 1, as a control experiment of Example 2, adjusted the finishing rolling parameters and simplified the steps, resulting in poor substrate performance, and the passivation film performance was slightly reduced due to the surface condition of the substrate; Comparative Example 2, as a control experiment of Example 2, replaced the corrosion inhibitor in the passivation solution with a single 2-benzothiazol-6-methoxyphenol, that is, removed the oleic acid imidazoline derivative, lacking long-chain hydrophobic groups, resulting in a reduced water contact angle and the worst protection; Comparative Example 3, as a control experiment of Example 2, did not perform hydroxylation of oleic acid imidazoline or grafting with 3-trismethylcinnamic acid, resulting in decreased hydrophobicity and a reduced slow-release effect; Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention shall be included within the scope of protection of this invention.

Claims

1. A method for preparing a reed with good durability, characterized in that, Includes the following steps: S1: Take the raw materials, melt them under an argon atmosphere, and then cast and cool them to obtain an ingot; S2: Homogenize the ingot, cool it in the furnace, mill the surface, and then perform initial rolling; S3: Anneal after initial rolling, and then perform fine rolling to obtain a thin strip, which is then stamped, cut, and annealed to obtain a rough spring sheet; S4: Take the rough spring sheet, clean it, dry it, polish it, and then immerse it in a passivation solution to obtain a finished spring sheet.

2. The method for preparing a durable spring according to claim 1, characterized in that, The smelting process parameters in S1 are as follows: the output power is 12.5-13.5KW until the raw materials are melted, then the output power is reduced to 10-12KW and held for 8-12 minutes.

3. The method for preparing a durable spring according to claim 1, characterized in that, The homogenization process parameters in S2 are: temperature of 650-700℃ and holding time of 5-10h; the initial rolling rate in S2 is 72-80%; and the thickness after milling is 3.00-4.00mm.

4. The method for preparing a durable spring according to claim 1, characterized in that, The annealing process parameters in S3 are as follows: temperature 450-500℃, holding time 3-4h, air cooling; the finishing rolling process parameters in S3 are as follows: the rolling rate of the first rolling is 50-55%, the first intermediate annealing temperature is 440-460℃, and the holding time is 2-3h; the rolling rate of the second rolling is 45-48%, the second intermediate annealing temperature is 600-700℃, and the holding time is 30-120s; the rolling rate of the third rolling is 40-45%, the third intermediate annealing temperature is 600-650℃, and the holding time is 4-6min; the rolling rate of the fourth rolling is 35-40%, the fourth intermediate annealing temperature is 600-700℃, and the holding time is 45-60s.

5. The method for preparing a durable spring according to claim 1, characterized in that, The annealing temperature after stamping in S3 is 280-300℃, and the holding time is 30-50 min; the chemical composition of the crude reed is: by mass percentage, 7.2-7.6% Sn, 0.15-0.20% P, 0.08-0.1% Ni, 0.2-0.25% Si, 0.1-0.3% Ti and the balance Cu.

6. The method for preparing a durable spring according to claim 1, characterized in that, The cleaning process in S4 involves sequentially treating with acetone, nitric acid, and ultrapure water. The polishing process parameters in S4 are as follows: electropolishing with a voltage of 4V relative to the titanium electrode in phosphoric acid for 1-3 minutes, followed by rinsing and drying. The passivation solution process parameters are as follows: immersion time of 20-30 minutes and immersion temperature of 55-60℃.

7. The method for preparing a durable spring according to claim 1, characterized in that, The passivation solution in S4 comprises the following raw materials by mass percentage: 1-4% benzotriazole, 0.3-0.5% surfactant, 2-5% corrosion inhibitor, 12-15% phytic acid, 1-2% citric acid, 2-5% ethanol, and the balance being deionized water; the surfactant is composed of cationic surfactant and nonionic surfactant.

8. The method for preparing a durable spring according to claim 7, characterized in that, The corrosion inhibitor is composed of an oleic acid imidazoline derivative and 2-benzothiazol-6-methoxyphenol in a mass ratio of (1-3):

1. The preparation steps of the oleic acid imidazoline derivative are as follows: oleic acid imidazoline, mercaptoethanol, and a photoinitiator are taken and reacted under a light intensity of 800-1000W for 30-40 minutes to obtain hydroxylated oleic acid imidazoline; hydroxylated oleic acid imidazoline is taken and 3-trifluoromethylcinnamic acid, a condensing agent, a catalyst, and a solvent are added under a nitrogen atmosphere. After reacting for 24 hours, the mixture is washed and precipitated to obtain the oleic acid imidazoline derivative.

9. The method for preparing a durable spring according to claim 8, characterized in that, The raw materials for the hydroxylated oleic acid imidazoline are: 2-3 parts by weight of oleic acid imidazoline, 1-1.5 parts by weight of mercaptoethanol, and 0.06-0.09 parts by weight of photoinitiator; the raw materials for the oleic acid imidazoline derivative are: 1-2 parts by weight of hydroxylated oleic acid imidazoline and 1.5-4 parts by weight of 3-trifluoromethylcinnamic acid.

10. A reed with good durability, characterized in that, It is prepared by the preparation method according to any one of claims 1-9.

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