A spraying water formula for protecting the conductive rod of a stripping tank and an application method thereof

Abstract

This invention discloses a spray water formula and application method for protecting conductive rods in a stripping bath, belonging to the field of stripping process technology. It consists of sodium citrate and deionized water, with a sodium citrate concentration of 15-35 g / L and the remainder being deionized water; the pH value of the spray water is 6.8-7.5. This invention utilizes a neutral spray water formula with sodium citrate as its core, leveraging sodium citrate's excellent pH buffering, metal complexing, and acid neutralizing properties to neutralize acidic residual liquid on the conductive rod surface in real time, maintaining a neutral surface environment. This addresses the industry pain points of acid corrosion, scaling, and unstable conductivity of conductive rods at their root, and is suitable for continuous electrolytic stripping mass production of diamond tungsten wire.

Description

Technical Field

[0001] This invention belongs to the field of stripping process technology, specifically a spray water formula and application method for protecting the conductive rods in the stripping tank. Background Technology

[0002] Electroplated diamond tungsten wire is a core consumable in high-end cutting and processing fields, widely used in the precision cutting and processing of photovoltaic silicon wafers, sapphire, cemented carbide, and magnetic materials. In the production process of diamond tungsten wire, rework of the electroplated layer, plating repair, and removal of residual layers all rely on a continuous electrolytic stripping process. The mainstream mature process in the industry is a hydrochloric acid + aminosulfonic acid composite acidic electrolytic stripping system.

[0003] The existing continuous stripping process works as follows: the diamond tungsten wire to be treated is used as the electrolytic anode, a titanium metal frame is placed inside the stripping tank as the electrolytic cathode, the wire is tightly wound with a metal conductive rod, and the anode current is continuously conducted through the conductive rod. The wire passes through the acidic stripping tank at a uniform speed, and under the action of the electric field, the excess metal coating and oxide residue on the surface of the tungsten wire are quickly stripped off, realizing continuous and efficient stripping production. It has the advantages of fast stripping rate, adaptability to mass production, and good coating uniformity, and is currently the main stripping process for diamond wire manufacturers.

[0004] However, this mainstream acid stripping system suffers from a long-standing and unresolved equipment corrosion defect: the hydrochloric acid and sulfamic acid compound system has extremely high acidity and volatility, continuously generating acidic mist during the stripping process, and the wire carrying acidic residues continuously adhering to the surface of the conductive rod. As a core conductive transmission component, the conductive rod, when exposed to acidic and humid conditions for extended periods, is highly susceptible to three major failure problems: 1. Electrochemical corrosion and oxidation blackening: After the surface of the conductive rod is coated with an acidic medium, a micro-electrolytic corrosion cell is formed under the condition of electrolysis, which causes pitting corrosion and oxidation blackening on the surface. This leads to an increase in conductive contact resistance, resulting in unstable current flow and uneven local current, which directly causes defects such as color difference in wire stripping, incomplete stripping, and local over-corrosion and wire breakage.

[0005] 2. Acidic salt deposits and scale: After the acidic residual liquid evaporates, it will form a layer of aminosulfonate and chloride crystal scale on the surface of the conductive rod. The scale layer has high hardness and strong adhesion, making it difficult to clean by regular wiping. After scaling, it will cause the wire to slip when it comes into contact with the conductive rod, resulting in uneven wire pressing, scratches, wire skipping, and misalignment, which will significantly increase the product defect rate.

[0006] 3. Short equipment lifespan and high maintenance costs: The conductive rods are constantly corroded and worn, requiring frequent shutdowns for disassembly, grinding, polishing, and replacement. Each maintenance shutdown is time-consuming, disrupting the continuous mass production rhythm and severely reducing the utilization rate of the production line equipment. At the same time, the high cost of consumable replacement and labor maintenance restricts the benefits of large-scale mass production.

[0007] Currently, the industry's conventional methods for protecting conductive rods are limited to manual rinsing and wiping during shutdown and periodic polishing and refurbishment. These methods are all passive remedial measures and cannot achieve real-time online protection during production. Manual wiping can only temporarily remove scale and cannot neutralize acidic media, so corrosion and scaling problems continue to occur during production. There is currently no online neutral protective spray formula or process specifically adapted to hydrochloric acid + sulfamic acid stripping systems and suitable for continuous wire feeding conditions. Summary of the Invention

[0008] To address the above problems, this invention provides a spray water formula and application method for protecting the conductive rods in the stripping tank. The neutral spray water formula, with sodium citrate as the core, leverages the excellent pH buffering, metal complexing, and acid neutralizing properties of sodium citrate to neutralize acidic residual liquid on the surface of the conductive rods in real time online, maintaining a neutral surface environment. This fundamentally solves the industry pain points of acid corrosion, scaling, and unstable conductivity of conductive rods, and is suitable for continuous electrolytic stripping mass production of diamond tungsten wire.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A spray water formula for protecting conductive rods in a stripping bath mainly consists of sodium citrate and deionized water, with a sodium citrate concentration of 15-35 g / L and the remainder being deionized water.

[0010] This formula uses sodium citrate as the buffer complex, and its components are simple, consisting only of sodium citrate and deionized water. It is non-corrosive, non-toxic, and suitable for continuous industrial production. It is used only for spray protection on the surface of the conductive rod and does not come into contact with the core stripping area of ​​the wire. It will not have any negative impact on the surface coating or substrate of the diamond tungsten wire. The concentration range of sodium citrate can provide sufficient pH buffering capacity and metal complexing capacity to neutralize the acidic stripping residue and acidic mist condensate adhering to the surface of the conductive rod, maintaining the surface environment of the conductive rod in the neutral range of 6.8-7.5. This inhibits the electrochemical corrosion, oxidation blackening, and salt accumulation of the conductive rod by the acidic medium, stabilizes the conductive contact between the conductive rod and the wire, and reduces the defect rate of wire breakage, off-center plating, and scratches.

[0011] In a preferred embodiment, the sodium citrate concentration is 25 g / L, the balance is deionized water, and the pH value of the spray water is 7.0-7.2.

[0012] A method for applying spray water to protect the conductive rods in a stripping bath, used in a continuous electrolytic stripping process for electroplated diamond tungsten wire, includes the following steps: (1) Process adaptation: The stripping tank uses hydrochloric acid + aminosulfonic acid composite acid stripping solution, with electroplated diamond tungsten wire as the anode and titanium metal frame as the cathode. The diamond tungsten wire is wound around the surface of the conductive rod and continuously and uniformly fed to perform continuous electrolytic stripping. (2) Spray pretreatment: Before the production line is started, the spray water is prepared and then loaded into the spray circulation system. The pH value of the spray water is measured to be 6.8-7.5, and the spray pressure is adjusted to 0.12-0.18MPa. (3) Online synchronous spraying: During the entire process of diamond tungsten wire wire stripping, the spraying system continuously and evenly sprays the spray water onto the surface of the conductive rod to rinse and neutralize the acidic stripping residue and acidic mist condensate adhering to the surface of the conductive rod. (4) Maintaining steady-state circulation: The spray water is circulated and filtered through the outlet of the storage tank, the circulation pump and the filter. The pH value of the spray water is tested every 4 hours. When the pH value is lower than 6.8, sodium citrate powder is added to the storage tank until the pH value is 6.8-7.5. (5) Shutdown protection: After the production line is shut down, spray continuously for 30-300 seconds to remove residual acidic medium on the surface of the conductive rod.

[0013] During continuous electrolytic stripping, the hydrochloric acid + sulfamic acid composite acidic stripping solution generates acidic mist, and the diamond tungsten wire carries the acidic residue, adhering to the surface of the conductive rod. Sodium citrate dissolves in deionized water to form citrate and sodium ions. Citrate ions, being a polybasic weak acid anion with pH buffering capacity, neutralize with hydrochloric acid and sulfamic acid, maintaining the pH of the conductive rod surface at 6.8-7.5. Citrate ions also complex with iron, titanium, and tungsten ions to form water-soluble complexes, inhibiting the crystallization and precipitation of sulfamic acid salts and chlorides. Continuous water spraying removes acidic residue and acidic mist condensate from the conductive rod surface. The neutral environment inhibits the formation of micro-electrolytic corrosion galvanic cells under energized electrolysis conditions, reducing pitting corrosion, oxidation blackening, and increased contact resistance on the conductive rod surface. After shutdown, continuous spraying removes residual acidic media, completing neutral passivation protection.

[0014] In a preferred embodiment, in step (1), the composition ratio of the hydrochloric acid + aminosulfonic acid composite acidic stripping solution is: aminosulfonic acid 80-120g / L, hydrochloric acid 10-60mL / L, and the remainder is deionized water.

[0015] In a preferred implementation, in step (1), the continuous wire feeding speed of the diamond tungsten wire is 10-45 m / min, and the spray covers the entire contact area of ​​the conductive rod with the wire. At the above continuous wire feeding speed, the spray covering the entire contact area of ​​the conductive rod with the wire ensures that the surface of the conductive rod continuously receives neutral spray protection under high-speed wire feeding and continuous energization conditions, avoiding spray dead zones. This solution is suitable for the mass production rhythm of continuous electrolytic deplating of diamond tungsten wire, reducing pitting corrosion, scaling, wire scratches, wire skipping, and misalignment caused by local acid residue on the conductive rod.

[0016] In a preferred embodiment, the spraying pressure in step (2) is 0.15 MPa. This spraying pressure allows the sodium citrate spray water to evenly cover the surface of the conductive rod, fully flushing away acidic residue and acidic mist condensate, while avoiding excessive pressure that could cause spray splashing, wire disturbance, and waste of spray water, and avoiding insufficient pressure that could cause insufficient coverage and spray dead zones, thereby improving the uniformity and reliability of online protection.

[0017] In a preferred embodiment, in step (4), when the pH value is below 6.8, sodium citrate powder is added to the storage tank until the pH value is 7.0-7.2.

[0018] In a preferred implementation, in step (5), the production line is continuously sprayed for 240 seconds after shutdown. Continuous spraying after shutdown can thoroughly remove the residual acidic stripping solution and acidic mist condensate on the surface of the conductive rod, so that the surface of the conductive rod is neutrally passivated and protected, avoiding the continued corrosion of the conductive rod surface by the acidic medium during shutdown, and reducing the amount of grinding, polishing and maintenance work before the next startup.

[0019] In a preferred implementation, in step (4), the spray water is circulated and filtered through the outlet of the storage tank, the circulation pump and the filter for 72 hours.

[0020] In a preferred embodiment, the sodium citrate has a purity of ≥99%.

[0021] Compared with the prior art, the beneficial effects of the present invention are: (1) The application method adapts the sodium citrate neutral spray water to the hydrochloric acid + aminosulfonic acid composite acidic continuous electrolytic stripping process. Through pre-treatment spraying before start-up, online synchronous spraying throughout the wire stripping process, cyclic steady-state maintenance and shutdown protection, the conductive rod is protected online in real time. The online spraying can continuously flush and neutralize the acidic residual liquid and acidic mist condensate on the surface of the conductive rod, avoid the acidic medium from staying and accumulating on the surface of the conductive rod, inhibit electrochemical corrosion, oxidation blackening and salt scale from the source, stabilize conductive contact, reduce wire stripping color difference, incomplete stripping, local over-corrosion and wire breakage caused by unstable conductivity, reduce equipment maintenance frequency and production cost, and is suitable for stripping production of all specifications of electroplated diamond tungsten wire, without being limited by wire diameter and coating thickness, and has a wide range of applications. The stripping solution is formulated to facilitate the rapid electrolytic stripping of the metal coating on the tungsten wire surface, ensuring continuous stripping efficiency. The neutral sodium citrate spray water can effectively neutralize and complex the acidic residual liquid within this acidity range, reducing the risk of corrosion caused by the volatilization and splashing of hydrochloric acid and aminosulfonic acid on the conductive rod surface. This ensures that the spray protection is matched with the stripping process parameters, improving the stability of continuous production. The spray water is circulated and filtered through a storage tank, a circulation pump, and a filter to remove solid impurities and crystalline particles from the spray liquid, keeping it clean. The circulation time reaches 72 hours, requiring only periodic testing and fine-tuning of the pH value. Frequent liquid changes are not necessary, significantly reducing spray water consumption and wastewater discharge, saving water and reducing energy consumption, and making it suitable for continuous industrial production. Attached Figure Description

[0022] Figure 1 These are photographs of the surface condition of the conductive rod after 30 days of spray protection according to Embodiment 1 of the present invention. Figure 2 Photographs showing the surface condition of conductive rods produced using the conventional non-spray protection process in Comparative Example 1 after 3 days. Figure 3 This is a pH value curve of the spray water in Example 1 after 9 days of recycling. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way. Example

[0024] A method for applying spray water to protect the conductive rods in a stripping bath, used in a continuous electrolytic stripping process for electroplated diamond tungsten wire, includes the following steps: (1) Spray water formulation At room temperature (25℃), take 60L of industrial-grade deionized water and weigh 1500g of sodium citrate powder with a purity ≥99%. Add the sodium citrate powder to the deionized water and mechanically stir for 8 minutes until completely dissolved. The solution should be clear and transparent, without precipitation or stratification. Then, place the solution into a spray circulation system (which will be cleaned with dilute hydrochloric acid and circulated twice with industrial water before use). The pH value of the solution is measured to be 7.1, the sodium citrate concentration is 25g / L, and the remainder is deionized water.

[0025] (2) Stripping process parameters The working solution in the stripping tank consists of 100 g / L aminosulfonic acid, 45 mL / L hydrochloric acid, and the remainder deionized water. The electrolysis process uses diamond-tungsten wire as the anode and a titanium frame as the cathode. The diamond-tungsten wire is wound continuously and uniformly around the surface of the conductive rod at a speed of 12 m / min, with a spray pressure of 0.15 MPa. The spray covers the entire contact area of ​​the conductive rod with the wire, eliminating any blind spots.

[0026] (3) Production and application process The production line is started, and the wire is continuously stripped of its plating.

[0027] The spray system is turned on simultaneously, and the spray head continuously and evenly sprays the spray water of this embodiment onto the surface of the conductive rod. The spray water washes away the acidic stripping residue and acidic mist condensate attached to the surface of the conductive rod, neutralizing the acidic medium.

[0028] The spray water uses a low-level circulating filtration system. Spray water enters the filter from the storage tank outlet via a circulating pump, and then flows into the spray pipes and spray heads. The pH value of the circulating spray water is checked every 4 hours. When the pH value drops below 6.8, sodium citrate powder is added to the storage tank to maintain the pH value at 7.0-7.2.

[0029] After production is completed and the machine is shut down, spray continuously for 240 seconds to clean the surface of the conductive rods of residual acidic medium. Implementation effect

[0030] Continuous production for 30 days of follow-up testing. For example... Figure 1 As shown, the conductive rod surface is free of blackening, pitting, and salt deposits, and its surface finish is consistent with that of a new rod. There were no skipped wires, scratches, or uneven plating removal throughout the process. No downtime for polishing or maintenance is required. The conductivity is stable, and equipment wear is significantly reduced. Example

[0031] A method for applying spray water to protect the conductive rods in a stripping bath, used in a continuous electrolytic stripping process for electroplated diamond tungsten wire, includes the following steps: (1) Spray water formulation At room temperature (25℃), take 100L of deionized water, weigh 1500g of sodium citrate powder with a purity ≥99%, add it to the deionized water, and stir for 10 minutes until completely dissolved. The sodium citrate concentration is 15g / L, and the remainder is deionized water. Then, put it into a spray circulation system (which will be cleaned with dilute hydrochloric acid and circulated twice with industrial water before use), and test the pH value to be 6.8.

[0032] (2) Stripping process parameters The stripping bath working solution consisted of 80 g / L aminosulfonic acid, 10 mL / L hydrochloric acid, and the remainder deionized water. Diamond-tungsten wire was used as the anode, and a titanium frame as the cathode. The wire feed speed was 10 m / min, and the spray pressure was 0.12 MPa. The spray covered the entire contact area of ​​the conductive rod with the wire.

[0033] (3) Production and application process The production line is started, and the wire is continuously stripped of its plating.

[0034] The spray system is activated simultaneously to continuously spray the conductive rod with the spray water described in this embodiment.

[0035] The spray water is circulated and filtered through the storage tank outlet, circulation pump, and filter before reuse. The pH value is checked every 4 hours. When the pH value is below 6.8, sodium citrate powder is added until the pH value is between 6.8 and 7.5.

[0036] After production ends and the machine is shut down, continue spraying for 30 seconds. Implementation effect

[0037] Continuous production and follow-up testing for 15 days. The conductive rod surface showed no blackening, pitting, or salt buildup. The wire showed no scratches or skipped wires. The conductive contact resistance was stable. The spray water was replaced after 72 hours of continuous use. This example is suitable for low-acidity, low-feed speed stripping production lines. Example

[0038] A method for applying spray water to protect the conductive rods in a stripping bath, used in a continuous electrolytic stripping process for electroplated diamond tungsten wire, includes the following steps: (1) Spray water formulation At room temperature (25℃), take 100L of deionized water, weigh 3500g of sodium citrate powder with a purity ≥99%, add it to the deionized water, and stir for 12 minutes until completely dissolved. The sodium citrate concentration is 35g / L, and the remainder is deionized water. Then, put it into a spray circulation system (which will be cleaned with dilute hydrochloric acid and circulated twice with industrial water before use), and test the pH value to be 7.5.

[0039] (2) Stripping process parameters The stripping bath working solution consisted of 120 g / L aminosulfonic acid, 60 mL / L hydrochloric acid, and the remainder deionized water. A diamond-tungsten wire was used as the anode, and a titanium frame as the cathode. The wire feed speed was 45 m / min, and the spray pressure was 0.18 MPa. The spray covered the entire contact area of ​​the conductive rod with the wire.

[0040] (3) Production and application process The production line is started, and the wire is continuously stripped of its plating.

[0041] The spray system is activated simultaneously to continuously spray the conductive rod with the spray water described in this embodiment.

[0042] The spray water is circulated and filtered through the storage tank outlet, circulation pump, and filter before reuse. The pH value is checked every 4 hours. When the pH value is below 6.8, sodium citrate powder is added until the pH value is 7.0-7.2.

[0043] After production ends and the machine is shut down, continue spraying for 300 seconds. Implementation effect

[0044] Continuous production and follow-up testing for 20 days. The conductive rod surface showed no blackening, pitting, or salt buildup. The wire showed no scratches, skipped wires, or uneven plating removal. The spray water was recycled for 72 hours. This example is suitable for high-acidity, high-wire-speed stripping production lines.

[0045] The sodium citrate spray water used in Example 1 was circulated for 9 days, and its pH value was measured. The blank control group was pure water circulation. The stability of the pH value of the spray water during use was verified. The test results are shown in the table below.

[0046]

[0047] like Figure 3 As shown, the pH value of the spray water remained stable at 7-7.5 for the first 3 days, which was in a neutral or slightly alkaline state, while the pure water control group was always in an acidic state.

[0048] Comparative Example 1: Using existing conventional production processes, without any spray water or other chemicals, the conductive rods are manually rinsed only during daily shutdowns. Implementation effect

[0049] After 1-2 days of production, slight blackening and pitting corrosion appeared on the surface of the conductive rod.

[0050] After 3 days of production, defects such as wire scratches and skipped threads appeared. Figure 2 As shown, black corrosion spots and a white crystalline scale layer appear on the surface.

[0051] The machine needs to be stopped for polishing and maintenance every 10-15 days, and damaged conductive rods should be inspected and replaced monthly.

[0052] The product defect rate is high, the production line equipment utilization rate is low, and the maintenance cost is high.

[0053] The comparison between the examples and Comparative Example 1 confirms that the sodium citrate neutral spray formulation of the present invention can specifically solve the core problems of corrosion, scaling, and unstable conductivity of conductive rods under the acidic stripping system of hydrochloric acid + aminosulfonic acid.

[0054] Comparative Example 2: Online spraying with deionized water was used, without the addition of sodium citrate. The spraying pressure was 0.15 MPa, the wire feed speed was 12 m / min, and the stripping bath working solution consisted of 100 g / L aminosulfonic acid, 45 mL / L hydrochloric acid, and the remainder deionized water. The remaining steps were the same as in Example 1. Implementation effect

[0055] Three days into production, the surface of the conductive rod showed slight blackening.

[0056] Five days into production, pitting corrosion appeared on the surface of the conductive rod, and the contact resistance increased.

[0057] After 7 days of production, salt deposits and scale appeared on the surface of the conductive rods, and scratches appeared on the wires.

[0058] After 10 days of production, the machine needs to be stopped for polishing and maintenance.

[0059] Comparative Example 3: Spray water with a sodium citrate concentration of 5 g / L and a pH of 6.5 was used, and the remaining steps were the same as in Example 1. Implementation effect

[0060] After 2 days of production, the pH value of the spray water is below 6.0.

[0061] Five days into production, the conductive rods developed blackening and pitting on their surface.

[0062] After 10 days of production, salt deposits and scale appeared on the surface of the conductive rods, and scratches and wire skipping appeared on the wires.

[0063] Production requires a 15-day shutdown for polishing and maintenance.

[0064] This comparative example illustrates that when the sodium citrate concentration is below 15 g / L, the buffering and complexing capacity of the spray water is insufficient, making it impossible to achieve online protection for the conductive rod.

[0065] Test Example 1: pH Buffering Capacity Test of Spray Water Take 1L of spray water from Example 1, Example 2, Example 3, Comparative Example 2 (deionized water), and Comparative Example 3 (spray water). Add 0.1mol / L hydrochloric acid to each sample at 25°C and record the pH changes.

[0066] Example 1: The initial pH was 7.1. After adding 50 mL of 0.1 mol / L hydrochloric acid, the pH was 6.9. After adding 100 mL, the pH was 6.8.

[0067] Example 2: The initial pH was 6.8. After adding 20 mL of 0.1 mol / L hydrochloric acid, the pH became 6.5.

[0068] Example 3: The initial pH was 7.5. After adding 100 mL of 0.1 mol / L hydrochloric acid, the pH became 7.0.

[0069] Comparative Example 2: Initial pH 7.0, pH 4.0 after adding 1 mL of 0.1 mol / L hydrochloric acid.

[0070] Comparative Example 3: Initial pH 6.5, pH 5.8 after adding 10 mL of 0.1 mol / L hydrochloric acid.

[0071] Test results show that the sodium citrate spray water of the present invention has a significant pH buffering capacity and can neutralize acidic media such as hydrochloric acid and aminosulfonic acid.

[0072] Test Example 2: Contact Resistance Test of Conductive Rod The contact resistance between the conductive rod and the wire was measured using a milliohmmeter. The initial contact resistance was 0.8 mΩ.

[0073] In Example 1, the contact resistance was 0.9 mΩ after 30 days of continuous production.

[0074] In Example 2, the contact resistance was 1.2 mΩ after 15 days of continuous production.

[0075] Example 3: After 20 days of continuous production, the contact resistance was 1.0 mΩ.

[0076] Comparative Example 1: The contact resistance was 3.5 mΩ after 3 days of production and 8.0 mΩ after 10 days of production.

[0077] Comparative Example 2: The contact resistance was 2.8 mΩ after 5 days of production.

[0078] The contact resistance of Comparative Example 3 was 4.2 mΩ after 7 days of production.

[0079] Test results show that the spray water of the present invention can stabilize the contact resistance of the conductive rod and reduce unstable current and uneven local current.

[0080] Test Example 3: Corrosion Rating Test of Conductive Rod Surface Visual inspection and microscopic observation were used to grade the corrosion area: Grade 0 was no corrosion; Grade 1 was corrosion area less than 5%; Grade 2 was corrosion area 5%-20%; and Grade 3 was corrosion area greater than 20%.

[0081] Example 1 was rated as level 0 after 30 days of production.

[0082] Example 2 was rated as level 0 after 15 days of production.

[0083] Example 3 was rated as level 0 after 20 days of production.

[0084] Comparative Example 1 was rated as Level 2 after 3 days of production.

[0085] Comparative Example 2 was rated as Level 1 after 5 days of production.

[0086] Comparative Example 3 was rated as Level 2 after 10 days of production.

[0087] Test results show that the spray water of this invention can inhibit the electrochemical corrosion and oxidative blackening of the conductive rod.

[0088] Test Example 4: Salt Scale Deposits Test The mass of the scale layer on the surface of the conductive rod was measured by weighing. The initial mass of the conductive rod was 1000.0 g.

[0089] In Example 1, the mass of the conductive rod was 1000.1g after 30 days of production.

[0090] In Example 2, the mass of the conductive rod was 1000.1g after 15 days of production.

[0091] In Example 3, the mass of the conductive rod was 1000.1g after 20 days of production.

[0092] After 3 days of production, the mass of the conductive rod in Comparative Example 1 was 1002.5g.

[0093] Comparative Example 2: The mass of the conductive rod after 5 days of production was 1001.8g.

[0094] After 10 days of production, the mass of the conductive rod in Comparative Example 3 was 1002.2g.

[0095] Test results show that the spray water of the present invention can inhibit the formation of aminosulfonate and chloride crystal scale.

[0096] Application Example 1: The formulation and method of Example 1 were used in a continuous electrolytic stripping production line for electroplated diamond-tungsten wire. The wire feed speed of the production line was 12 m / min, and the working solution of the stripping tank was 100 g / L aminosulfonic acid and 45 mL / L hydrochloric acid. Continuous operation was maintained for 30 days. The conductive rods did not require downtime for polishing and maintenance. The wire breakage rate decreased from 0.8% in the traditional process to 0.1%. The wire scratch defect rate decreased from 1.5% in the traditional process to 0.2%. The uneven stripping defect rate decreased from 1.2% in the traditional process to 0.15%. The service life of the conductive rods was extended from 10-15 days in the traditional process to 180 days. The frequency of production line downtime for maintenance decreased from 3 times per month to once every 6 months.

[0097] Application Example 2: The formulation and method of Example 2 were used in a low-acidity, low-speed continuous electrolytic stripping production line for diamond tungsten wire. The working solution in the stripping tank consisted of 80 g / L aminosulfonic acid and 10 mL / L hydrochloric acid, and the wire feed speed was 10 m / min. The line ran continuously for 15 days. The conductive rod surface showed no blackening, pitting, or salt buildup. The wire showed no scratches or wire skipping. The spray water was recycled for 72 hours. This application example demonstrates the protective effect of the formulation of this invention under low-acidity, low-speed operating conditions.

[0098] Application Example 3: The formulation and method of Example 3 were used in a high-acidity, high-speed continuous electrolytic stripping production line for diamond tungsten wire. The working solution in the stripping tank consisted of 120 g / L aminosulfonic acid and 60 mL / L hydrochloric acid, and the wire feed speed was 45 m / min. The line ran continuously for 20 days. The conductive rod surface showed no blackening, pitting, or salt buildup. The wire showed no scratches, skipped wires, or uneven stripping. The spray water was recycled for 72 hours. This application example demonstrates that the formulation of this invention has a protective effect under high-acidity, high-speed operating conditions.

[0099] It should be noted that, in this document, the terms "comprising," "including," and any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or variations without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A spray water formula for protecting conductive rods in a stripping tank, characterized in that, It is mainly composed of sodium citrate and deionized water, with a sodium citrate concentration of 15-35 g / L and the remainder being deionized water.

2. The spray water formula for protecting the conductive rod in the stripping tank according to claim 1, characterized in that, The sodium citrate concentration is 25 g / L, and the remainder is deionized water. The pH value of the spray water is 7.0-7.

2.

3. A method for applying spray water to protect conductive rods in a stripping tank, characterized in that, This process, applied to the continuous electrolytic stripping of electroplated diamond-tungsten wire, includes the following steps: (1) Process adaptation: The stripping tank uses hydrochloric acid + aminosulfonic acid composite acid stripping solution, with electroplated diamond tungsten wire as the anode and titanium metal frame as the cathode. The diamond tungsten wire is wound around the surface of the conductive rod and continuously and uniformly fed to perform continuous electrolytic stripping. (2) Spray pretreatment: Before the production line is started, the spray water described in any one of claims 1-2 is prepared and then loaded into the spray circulation system. The pH value of the spray water is measured to be 6.8-7.5, and the spray pressure is adjusted to 0.12-0.18 MPa. (3) Online synchronous spraying: During the entire process of diamond tungsten wire wire stripping, the spraying system continuously and evenly sprays the spray water onto the surface of the conductive rod to rinse and neutralize the acidic stripping residue and acidic mist condensate adhering to the surface of the conductive rod. (4) Maintaining steady-state circulation: The spray water is circulated and filtered through the outlet of the storage tank, the circulation pump and the filter. The pH value of the spray water is tested every 4 hours. When the pH value is lower than 6.8, sodium citrate powder is added to the storage tank until the pH value is 6.8-7.

5. (5) Shutdown protection: After the production line is shut down, spray continuously for 30-300 seconds to remove residual acidic medium on the surface of the conductive rod.

4. The method for applying spray water according to claim 3, characterized in that, In step (1), the composition ratio of the hydrochloric acid + aminosulfonic acid composite acidic stripping solution is: aminosulfonic acid 80-120g / L, hydrochloric acid 10-60mL / L, and the remainder is deionized water.

5. The method for applying spray water according to claim 3, characterized in that, In step (1), the continuous wire feeding speed of the diamond tungsten wire is 10-45 m / min, and the spray covers the entire contact area of ​​the conductive rod with the wire.

6. The method for applying spray water according to claim 3, characterized in that, In step (2), the spray pressure is 0.15 MPa.

7. The method for applying spray water according to claim 3, characterized in that, In step (4), when the pH value is lower than 6.8, sodium citrate powder is added to the storage tank until the pH value is 7.0-7.

2.

8. The method for applying spray water according to claim 3, characterized in that, In step (5), the production line continues to spray for 240 seconds after it stops.

9. The method for applying spray water according to claim 3, characterized in that, In step (4), the spray water is circulated and filtered through the outlet of the storage tank, the circulation pump and the filter for 72 hours.

10. The spray water formula for protecting the conductive rod in the stripping tank according to claim 1, characterized in that, The sodium citrate has a purity of ≥99%.

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