Method for electroplating gold on surface of beryllium bronze part

Abstract

The invention discloses a method for electroplating gold on the surface of a beryllium bronze part, which comprises the following steps of: removing oil, pre-corroding, loosening oxide skin, brightening, weakly corroding, cleaning, flash plating copper, nickel-plating, activating, pre-plating gold and plating gold on the surface of the beryllium bronze part to finally obtain the beryllium bronze part with a qualified gold-plated layer.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating gold, and in particular to a method for electroplating gold on the surface of a beryllium bronze part. Background Art

[0002] Beryllium bronze has high strength, elasticity, hardness, excellent electrical conductivity and thermal conductivity, especially after aging heat treatment, its comprehensive performance is further improved, therefore, beryllium bronze has been widely used in aerospace and other fields. However, beryllium bronze is easy to oxidize, the surface oxide layer is more serious after heat treatment, and the chemical properties of the oxide film layer are stable, which makes it difficult to process and cannot meet the application requirements of aerospace products. Therefore, beryllium bronze parts are usually plated with gold to improve the electrical conductivity and weldability of beryllium bronze parts so as to meet the use requirements of aerospace. Based on this, the coating bonding strength and weldability of the gold plating process of beryllium bronze parts are particularly important, but the existing electroplating gold plating process of beryllium bronze parts still has the following defects: beryllium bronze is easy to oxidize, especially after heat treatment, the oxide skin is thick and stable, and the pre-treatment is not clean, which will lead to poor coating bonding strength; in order to make the coating more firm during gold plating, nickel is needed as the bottom layer, but nickel is very easy to passivate and hydrolyze, and the bonding strength between the nickel layer and the gold layer is poor after electroplating, and the product qualification rate is low. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a method for electroplating gold on the surface of beryllium bronze parts.

[0004] A method for electroplating gold on the surface of a beryllium bronze part comprises the following steps:

[0005] S1: Degreasing;

[0006] S2: Pre-corrosion: Place the degreased beryllium bronze parts in a hydrochloric acid solution with a concentration of 150-200 g / L for pre-corrosion. The pre-corrosion time is 0.5-1.5 min and the solution temperature is 10-35 °C.

[0007] S3: Loosening oxide scale: placing the pre-corroded beryllium bronze parts in a sodium hydroxide solution with a concentration of 500-600 g / L to loosen the oxide scale. The solution temperature is 100-120°C and the time for loosening the oxide scale is 10-30 minutes.

[0008] S4: Polishing: Place the loosened oxide-scaled beryllium bronze parts in a mixed solution consisting of 90-150 g / L chromic anhydride and 20-30 g / L sulfuric acid for polishing. The solution temperature is 10-35°C and the polishing time is 3-15 seconds.

[0009] S5: Weak corrosion: Place the polished beryllium bronze parts in a hydrochloric acid solution or sulfuric acid solution with a concentration of 30-50 g / L for weak corrosion for 0.5-2 min.

[0010] S6: cleaning: the weakly corroded beryllium bronze parts are placed in a sodium carbonate decahydrate solution with a concentration of 30-100 g / L for cleaning, and the cleaning time is 0.5-2 min;

[0011] S7: Flash copper plating: Place the cleaned beryllium bronze parts in a mixed solution of 25-30g / L cuprous cyanide, 10-20g / L sodium hydroxide and 8-20g / L potassium cyanide for flash copper plating. The solution temperature is 25-40°C and the flash current density is 0.3-2A / dm 2 , the flash plating time is 5 to 8 minutes;

[0012] S8: nickel plating; placing the beryllium bronze parts after flash copper plating in a plating solution for nickel plating, wherein the pH of the plating solution is 3.9-4.4, the temperature is 52-58°C, and the nickel plating time is 4-6 min / μm;

[0013] S9: Activation: Place the nickel-plated beryllium bronze parts in an acid salt solution with a concentration of 80-90 g / L for activation. The temperature of the acid salt solution is 25-50°C and the activation time is 1-2 minutes.

[0014] S10: pre-gold plating; placing the activated beryllium bronze parts in a plating solution for pre-gold plating, wherein the pH of the plating solution is 3.6-4, the gold ion concentration in the plating solution is 0.6-1.5 g / L, the solution specific gravity is 10-14, the gold plating time is 1-2 min, and after the pre-gold plating is completed, it is cleaned with deionized water;

[0015] S11: gold plating; placing the pre-gold-plated beryllium bronze parts in a plating solution for gold plating, wherein the pH of the plating solution is 4.4-5, the gold ion concentration in the plating solution is 2.6-4.8 g / L, the solution specific gravity is 9-12, and the gold plating time is 10-15 min / μm. After the gold plating is completed, the beryllium bronze parts are cleaned with deionized water to obtain the gold-plated beryllium bronze parts.

[0016] Furthermore, the S1 further includes:

[0017] S1.1: Use organic solvents to clean beryllium bronze parts;

[0018] S1.2: Place the cleaned beryllium bronze parts in a mixed solution of 5-15 g / L sodium hydroxide, 20-30 g / L sodium carbonate, 30-60 g / L sodium phosphate and 3-5 g / L sodium silicate for ultrasonic cleaning and degreasing. The solution temperature is 60-80 °C and the degreasing time is 5-15 min. Then, electrochemical cathode degreasing is performed for 3-5 min.

[0019] Beneficial effects of the present invention:

[0020] The invention removes oxides that are difficult to remove from the surface of a beryllium bronze part by "boiling" in an alkaline solution, thereby obtaining a metal layer with a clean surface and uniformity, and further removes poor structures on the metal surface by corrosion and light emission, thereby facilitating improving the bonding force between a substrate and a plated layer. By flash-plating copper, a transition layer with better bonding force is formed between the copper layer and the beryllium bronze substrate, and nickel is plated on this basis to obtain a dense, uniform, high-hardness, good-corrosion-resistant and good-weldability aminosulfonic acid nickel layer. However, since the nickel layer is very easy to be hydrolyzed and passivated, commercially available acid salt AS30 is used for activation treatment, and finally pre-gold plating and gold plating are performed on the basis of the intermediate nickel layer, thereby finally obtaining a beryllium bronze part with a qualified gold plating layer.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a test result diagram of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0024] Example 1

[0025] The embodiment of the present invention provides a method for electroplating gold on the surface of a beryllium bronze part, which mainly includes the following steps:

[0026] S1: Place the beryllium bronze parts in an organic solvent for degreasing and cleaning until there is no obvious oil stain visually; the organic solvent can be 120# gasoline, or a metal cleaning agent with a volume ratio of 2%.

[0027] S2: The cleaned beryllium bronze parts are placed in a mixed solution of 5g / L sodium hydroxide, 20g / L sodium carbonate, 30g / L sodium phosphate and 3g / L sodium silicate for ultrasonic cleaning and degreasing. The cleaning frequency is 40Hz, the solution temperature is 80℃, and the degreasing time is 5min. Then, electrochemical cathode degreasing is performed for 3min to remove oil stains and other foreign matter on the surface of the parts.

[0028] S3: Place the degreased beryllium bronze parts in a 150g / L hydrochloric acid solution for pre-corrosion. The pre-corrosion time is 0.5min and the solution temperature is 35°C. After the corrosion is completed, quickly rinse the beryllium bronze parts with running water.

[0029] S4: Place the pre-corroded beryllium bronze parts in a 500g / L sodium hydroxide solution and shake it continuously to loosen the oxide scale. The solution temperature is 100°C and the time for loosening the oxide scale is 30 minutes. After loosening the oxide scale, immediately rinse the beryllium bronze parts with running water.

[0030] S5: Place the loosened oxide scale beryllium bronze parts in a mixed solution of 90g / L chromic anhydride and 20g / L sulfuric acid and shake continuously for polishing. The solution temperature is 10°C and the polishing time is 15s. The oxide scale and undesirable tissue on the surface of the beryllium bronze parts are removed through the polishing process, thereby increasing the bonding strength between the coating and the substrate. After the polishing process, the metal surface of the beryllium bronze parts presents a uniform golden color.

[0031] S6: Place the polished beryllium bronze parts in a 30g / L hydrochloric acid solution and shake it continuously for weak corrosion. The operation is carried out at room temperature for 2 minutes. After the weak corrosion is completed, the beryllium bronze parts are immediately rinsed with running water.

[0032] S7: Place the weakly corroded beryllium bronze parts in a 30g / L sodium carbonate decahydrate solution at room temperature for cleaning. Shake continuously during the cleaning process for 2 minutes to neutralize the acid remaining on the surface of the beryllium bronze parts to facilitate the next step. After cleaning, rinse the beryllium bronze parts with running water immediately.

[0033] S8: Place the cleaned beryllium bronze parts in a mixed solution of 25 g / L cuprous cyanide, 10 g / L sodium hydroxide and 8 g / L potassium cyanide for flash copper plating. The solution temperature is 25 °C and the flash current density is 0.3 A / dm 2 , the flash plating time is 8min; the beryllium bronze parts after cleaning in S7 are connected to the cathode of the power supply, and flash copper is plated in the mixed solution after power is turned on to improve the bonding strength between the final gold-plated layer and the beryllium bronze part substrate, ensure that the gold-plated layer is not easy to fall off, and at the same time improve the corrosion resistance of the gold-plated layer.

[0034] S9: Place the beryllium bronze parts after flash copper plating in the electroplating solution for nickel plating. The electroplating solution uses the commercially available high-speed nickel sulfamate NI-SULPHAMATE HS solution. The pH of the electroplating solution is controlled at 4.4, the temperature is controlled at 58°C, the nickel plating time is 4min / μm, and the nickel plating layer thickness is 4μm. After the nickel plating is completed, rinse the beryllium bronze parts with running water; the nickel sulfamate base layer has good corrosion resistance and high hardness, which can significantly improve the hardness and corrosion resistance of the gold-plated layer, especially in highly corrosive occasions, and can effectively prevent the metal surface of the gold-plated layer from being damaged due to corrosion, and at the same time can increase the brazing performance of the beryllium bronze parts.

[0035] S10: The nickel-plated beryllium bronze parts are placed in an activated acid salt AS30 solution with a concentration of 80g / L for activation. The temperature of the acid salt solution is 25°C and the activation time is 2min. Since the nickel-plated layer is very easy to passivate and hydrolyze, and the electroplated gold layer causes the plating layer to peel and blister, commercially available activated acid salts are used for activation, which increases the bonding force between the nickel layer and the gold layer, so that the gold layer does not bubble or change color after gold plating, and the thickness is uniform and the color is consistent, which effectively reduces the defective rate of products.

[0036] S11: placing the activated beryllium bronze parts in a plating solution for pre-gold plating, wherein the plating solution uses a commercially available PRECIOUSFAB Au-ST100 pre-gold plating solution; wherein the pH of the plating solution is 3.6, the gold ion concentration in the plating solution is 0.6 g / L, the specific gravity is 10, and the gold plating time is 2 min. After the pre-gold plating is completed, the beryllium bronze parts are cleaned with deionized water. The pre-gold plating ensures the bonding strength between the final gold plating layer and the substrate and improves the density of the gold plating layer.

[0037] S12: Placing the pre-gold-plated beryllium bronze parts in an electroplating solution for gold plating, wherein the electroplating solution adopts a commercially available PRECIOUSFAB Au-MLA200 pre-gold plating solution; wherein the pH value of the electroplating solution is 4.4, the gold ion concentration in the electroplating solution is 2.6 g / L, the specific gravity is 9, the gold plating time is 10 min / μm, and the thickness of the gold plating layer is 5 μm. After the gold plating is completed, the beryllium bronze parts are cleaned with deionized water to obtain qualified gold-plated beryllium bronze parts.

[0038] Example 2

[0039] The embodiment of the present invention provides a method for electroplating gold on the surface of a beryllium bronze part, which mainly includes the following steps:

[0040] S1: Place the beryllium bronze parts in an organic solvent for degreasing and cleaning until there is no obvious oil stain visually; the organic solvent can be 120# gasoline, or a metal cleaning agent with a volume ratio of 2%.

[0041] S2: The cleaned beryllium bronze parts are placed in a mixed solution of 15g / L sodium hydroxide, 30g / L sodium carbonate, 60g / L sodium phosphate and 5g / L sodium silicate for ultrasonic cleaning and degreasing. The cleaning frequency is 40Hz, the solution temperature is 60℃, and the degreasing time is 15min. Then, electrochemical cathode degreasing is performed for 5min to remove oil stains and other foreign matter on the surface of the parts.

[0042] S3: Place the degreased beryllium bronze parts in a 200g / L hydrochloric acid solution for pre-corrosion. The pre-corrosion time is 1.5 minutes and the solution temperature is 10°C. After the corrosion is completed, quickly rinse the beryllium bronze parts with running water.

[0043] S4: Place the pre-corroded beryllium bronze parts in a sodium hydroxide solution with a concentration of 600g / L and shake continuously to loosen the oxide scale. The solution temperature is 120°C and the time for loosening the oxide scale is 10 minutes. After loosening the oxide scale, immediately rinse the beryllium bronze parts with running water.

[0044] S5: Place the loosened oxide scale beryllium bronze parts in a mixed solution of 150g / L chromic anhydride and 30g / L sulfuric acid and shake continuously for polishing. The solution temperature is 35°C and the polishing time is 3s. The oxide scale and undesirable tissue on the surface of the beryllium bronze parts are removed through the polishing process, thereby increasing the bonding strength between the coating and the substrate. After the polishing process, the metal surface of the beryllium bronze parts presents a uniform golden color.

[0045] S6: Place the polished beryllium bronze parts in a 50g / L hydrochloric acid solution and shake it continuously for weak corrosion. The operation is carried out at room temperature for 0.5min. After the weak corrosion is completed, the beryllium bronze parts are immediately rinsed with running water.

[0046] S7: Place the weakly corroded beryllium bronze parts in a 100g / L sodium carbonate decahydrate solution at room temperature for cleaning. Shake continuously during the cleaning process for 0.5min to neutralize the acid remaining on the surface of the beryllium bronze parts to facilitate the next step. After cleaning, rinse the beryllium bronze parts with running water immediately.

[0047] S8: Place the cleaned beryllium bronze parts in a mixed solution of 30 g / L cuprous cyanide, 20 g / L sodium hydroxide and 20 g / L potassium cyanide for flash copper plating. The solution temperature is 40 °C and the flash current density is 2 A / dm 2 , the flash plating time is 5 minutes; the beryllium bronze parts after cleaning in S7 are connected to the cathode of the power supply, and flash copper is plated in the mixed solution after power is turned on to improve the bonding strength between the final gold-plated layer and the beryllium bronze part substrate, ensure that the gold-plated layer is not easy to fall off, and at the same time improve the corrosion resistance of the gold-plated layer.

[0048] S9: Place the beryllium bronze parts after flash copper plating in the electroplating solution for nickel plating. The electroplating solution uses the commercially available high-speed nickel sulfamate NI-SULPHAMATE HS solution. The pH of the electroplating solution is controlled at 3.9, the temperature is controlled at 52°C, the nickel plating time is 6 min / μm, and the nickel plating layer thickness is 7μm. After the nickel plating is completed, the beryllium bronze parts are rinsed with running water. The nickel sulfamate base layer has good corrosion resistance and high hardness, which can significantly improve the hardness and corrosion resistance of the gold-plated layer, especially in highly corrosive occasions. It can effectively prevent the metal surface of the gold-plated layer from being damaged due to corrosion, and at the same time can increase the brazing performance of the beryllium bronze parts.

[0049] S10: The nickel-plated beryllium bronze parts are placed in an activated acid salt AS30 solution with a concentration of 90g / L for activation. The temperature of the acid salt solution is 50°C and the activation time is 1min. Since the nickel-plated layer is very easy to passivate and hydrolyze, and the electroplated gold layer causes the plating layer to peel and blister, commercially available activated acid salts are used for activation, which increases the bonding strength between the nickel layer and the gold layer, so that the gold layer does not bubble or change color after gold plating, and the thickness is uniform and the color is consistent, which effectively reduces the defective rate of products.

[0050] S11: placing the activated beryllium bronze parts in a plating solution for pre-gold plating, wherein the plating solution uses a commercially available PRECIOUSFAB Au-ST100 pre-gold plating solution; wherein the pH of the plating solution is 4, the gold ion concentration in the plating solution is 1.5 g / L, the specific gravity is 14, and the gold plating time is 1 min. After the pre-gold plating is completed, the beryllium bronze parts are cleaned with deionized water. The pre-gold plating ensures the bonding strength between the final gold plating layer and the substrate and improves the density of the gold plating layer.

[0051] S12: placing the pre-gold-plated beryllium bronze parts in an electroplating solution for gold plating, wherein the electroplating solution adopts a commercially available PRECIOUSFAB Au-MLA200 pre-gold plating solution; wherein the pH value of the electroplating solution is 5, the gold ion concentration in the electroplating solution is 4.8 g / L, the specific gravity is 12, the gold plating time is 15 min / μm, and the thickness of the gold plating layer is 8 μm. After the gold plating is completed, the beryllium bronze parts are cleaned with deionized water to obtain qualified gold-plated beryllium bronze parts.

[0052] Example 3

[0053] The embodiment of the present invention provides a method for electroplating gold on the surface of a beryllium bronze part, which mainly includes the following steps:

[0054] S1: Place the beryllium bronze parts in an organic solvent for degreasing and cleaning until there is no obvious oil stain visually; the organic solvent can be 120# gasoline, or a metal cleaning agent with a volume ratio of 2%.

[0055] S2: The cleaned beryllium bronze parts are placed in a mixed solution of 10g / L sodium hydroxide, 25g / L sodium carbonate, 45g / L sodium phosphate and 4g / L sodium silicate for ultrasonic cleaning and degreasing. The cleaning frequency is 40Hz, the solution temperature is 70 degrees, and the degreasing time is 10min. Then, electrochemical cathode degreasing is performed for 4min to remove oil stains and other foreign matter on the surface of the parts.

[0056] S3: Place the degreased beryllium bronze parts in a hydrochloric acid solution with a concentration of 175 g / L for pre-corrosion. The pre-corrosion time is 1 min and the solution temperature is 22°C. After the corrosion is completed, quickly rinse the beryllium bronze parts with running water.

[0057] S4: Place the pre-corroded beryllium bronze parts in a 550g / L sodium hydroxide solution and shake it continuously to loosen the oxide scale. The solution temperature is 110°C and the time for loosening the oxide scale is 20 minutes. After loosening the oxide scale, immediately rinse the beryllium bronze parts with running water.

[0058] S5: Place the loosened oxide scale beryllium bronze parts in a mixed solution of 120g / L chromic anhydride and 25g / L sulfuric acid and shake continuously for polishing. The solution temperature is 22°C and the polishing time is 9s. The oxide scale and undesirable tissue on the surface of the beryllium bronze parts are removed through the polishing process, thereby increasing the bonding strength between the coating and the substrate. After the polishing process, the metal surface of the beryllium bronze parts presents a uniform golden color.

[0059] S6: Place the polished beryllium bronze parts in a 40g / L hydrochloric acid solution and shake it continuously for weak corrosion. The operation is carried out at room temperature for 1.2 minutes. After the weak corrosion is completed, the beryllium bronze parts are immediately rinsed with running water.

[0060] S7: Place the weakly corroded beryllium bronze parts in a 65g / L sodium carbonate decahydrate solution at room temperature for cleaning. Shake continuously during the cleaning process for 1.2 minutes to neutralize the acid remaining on the surface of the beryllium bronze parts to facilitate the next step. After cleaning, rinse the beryllium bronze parts with running water immediately.

[0061] S8: Place the cleaned beryllium bronze parts in a mixed solution of 27 g / L cuprous cyanide, 15 g / L sodium hydroxide and 14 g / L potassium cyanide for flash copper plating. The solution temperature is 32 °C and the flash current density is 1.2 A / dm 2 , the flash plating time is 7 minutes; the beryllium bronze parts cleaned in S7 are connected to the cathode of the power supply, and flash copper is plated in the mixed solution after power is turned on to improve the bonding strength between the final gold-plated layer and the beryllium bronze part substrate, ensure that the gold-plated layer is not easy to fall off, and at the same time improve the corrosion resistance of the gold-plated layer.

[0062] S9: Place the beryllium bronze parts after flash copper plating in the electroplating solution for nickel plating. The electroplating solution uses the commercially available high-speed nickel sulfamate NI-SULPHAMATE HS solution. The pH of the electroplating solution is controlled at 4.2, the temperature is controlled at 55°C, the nickel plating time is 5min / μm, and the nickel plating layer thickness is 5.5μm. After the nickel plating is completed, the beryllium bronze parts are rinsed with running water; the nickel sulfamate base layer has good corrosion resistance and high hardness, which can significantly improve the hardness and corrosion resistance of the gold-plated layer, especially in highly corrosive occasions, and can effectively prevent the metal surface of the gold-plated layer from being damaged due to corrosion, and at the same time can increase the brazing performance of the beryllium bronze parts.

[0063] S10: The nickel-plated beryllium bronze parts are placed in an activated acid salt AS30 solution with a concentration of 85g / L for activation. The temperature of the acid salt solution is 42°C and the activation time is 1.5min. Since the nickel-plated layer is very easy to passivate and hydrolyze, and the electroplated gold layer causes the plating layer to peel and blister, the commercially available activated acid salt is used for activation, which increases the bonding force between the nickel layer and the gold layer, so that the gold layer does not bubble or change color after gold plating, and the thickness is uniform and the color is consistent, which effectively reduces the defective rate of the product.

[0064] S11: placing the activated beryllium bronze parts in a plating solution for pre-gold plating, wherein the plating solution uses a commercially available PRECIOUSFAB Au-ST100 pre-gold plating solution; wherein the pH of the plating solution is 3.8, the gold ion concentration in the plating solution is 1 g / L, the specific gravity is 12, and the gold plating time is 1.5 min. After the pre-gold plating is completed, the beryllium bronze parts are cleaned with deionized water. The pre-gold plating ensures the bonding strength between the final gold plating layer and the substrate and improves the density of the gold plating layer.

[0065] S12: Placing the pre-gold-plated beryllium bronze parts in an electroplating solution for gold plating, wherein the electroplating solution adopts a commercially available PRECIOUSFAB Au-MLA200 pre-gold plating solution; wherein the pH value of the electroplating solution is 4.7, the gold ion concentration in the electroplating solution is 3.6 g / L, the specific gravity is 10, the gold plating time is 12.5 min / μm, and the thickness of the gold plating layer is 6.5 μm. After the gold plating is completed, the beryllium bronze parts are cleaned with deionized water to obtain qualified gold-plated beryllium bronze parts.

[0066] See also Figure 1 Through the method of the present invention, finally, after a thermal shock test at a test temperature of -196°C to +150°C, a temperature rise rate of ≥16°C / min, +200°C insulation for 13min, -196°C insulation for 2min, and a cycle number of ≥100 times, the gold-plated layer has a consistent appearance color and has no blistering, peeling, flaking, breaking, or the like, and a qualified surface electroplated gold beryllium bronze part is obtained.

[0067] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A method for electroplating gold on the surface of beryllium bronze parts, characterized in that: The following steps are involved: S1: Degreasing; S2: pre-corrosion; The degreased beryllium bronze parts are placed in a hydrochloric acid solution with a concentration of 150-200 g / L for pre-corrosion. The pre-corrosion time is 0.5-1.5 min and the solution temperature is 10-35 °C. S3: Loosening oxide scale: placing the pre-corroded beryllium bronze parts in a sodium hydroxide solution with a concentration of 500-600 g / L to loosen the oxide scale. The solution temperature is 100-120°C and the time for loosening the oxide scale is 10-30 minutes. S4: Polishing: Place the loosened oxide-scaled beryllium bronze parts in a mixed solution consisting of 90-150 g / L chromic anhydride and 20-30 g / L sulfuric acid for polishing. The solution temperature is 10-35°C and the polishing time is 3-15 seconds. S5: Weak corrosion: Place the polished beryllium bronze parts in a hydrochloric acid solution or sulfuric acid solution with a concentration of 30-50 g / L for weak corrosion for 0.5-2 min. S6: cleaning: the weakly corroded beryllium bronze parts are placed in a sodium carbonate decahydrate solution with a concentration of 30-100 g / L for cleaning, and the cleaning time is 0.5-2 min; S7: Flash copper plating: Place the cleaned beryllium bronze parts in a mixed solution of 25-30g / L cuprous cyanide, 10-20g / L sodium hydroxide and 8-20g / L potassium cyanide for flash copper plating. The solution temperature is 25-40°C and the flash current density is 0.3-2A / dm 2 , the flash plating time is 5 to 8 minutes; S8: nickel plating; placing the beryllium bronze parts after flash copper plating in a plating solution for nickel plating, wherein the pH of the plating solution is 3.9-4.4, the temperature is 52-58°C, and the nickel plating time is 4-6 min / μm; S9: Activation: Place the nickel-plated beryllium bronze parts in an acid salt solution with a concentration of 80-90 g / L for activation. The temperature of the acid salt solution is 25-50°C and the activation time is 1-2 minutes. S10: pre-gold plating; placing the activated beryllium bronze parts in a plating solution for pre-gold plating, wherein the pH of the plating solution is 3.6-4, the gold ion concentration in the plating solution is 0.6-1.5 g / L, the solution specific gravity is 10-14, the gold plating time is 1-2 min, and after the pre-gold plating is completed, it is cleaned with deionized water; S11: gold plating; placing the pre-gold-plated beryllium bronze parts in a plating solution for gold plating, wherein the pH of the plating solution is 4.4-5, the gold ion concentration in the plating solution is 2.6-4.8 g / L, the solution specific gravity is 9-12, and the gold plating time is 10-15 min / μm. After the gold plating is completed, the beryllium bronze parts are cleaned with deionized water to obtain the gold-plated beryllium bronze parts.

2. The method for electroplating gold on the surface of beryllium bronze parts according to claim 1, characterized in that: The S1 further comprises: S1.1: Use organic solvents to clean beryllium bronze parts; S1.2: Place the cleaned beryllium bronze parts in a mixed solution of 5-15 g / L sodium hydroxide, 20-30 g / L sodium carbonate, 30-60 g / L sodium phosphate and 3-5 g / L sodium silicate for ultrasonic cleaning and degreasing. The solution temperature is 60-80 °C and the degreasing time is 5-15 min. Then, electrochemical cathode degreasing is performed for 3-5 min.

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