CN114908354A - Surface treatment method of soft brass wire - Google Patents
Surface treatment method of soft brass wire Download PDFInfo
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- CN114908354A CN114908354A CN202210412473.7A CN202210412473A CN114908354A CN 114908354 A CN114908354 A CN 114908354A CN 202210412473 A CN202210412473 A CN 202210412473A CN 114908354 A CN114908354 A CN 114908354A
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- pickling
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- 229910001369 Brass Inorganic materials 0.000 title claims abstract description 58
- 239000010951 brass Substances 0.000 title claims abstract description 58
- 238000004381 surface treatment Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 84
- 238000005406 washing Methods 0.000 claims abstract description 33
- 238000005554 pickling Methods 0.000 claims abstract description 32
- 239000003960 organic solvent Substances 0.000 claims abstract description 24
- 238000004140 cleaning Methods 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 7
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 24
- 238000007127 saponification reaction Methods 0.000 claims description 21
- 238000002791 soaking Methods 0.000 claims description 19
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 14
- 239000012964 benzotriazole Substances 0.000 claims description 14
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims description 9
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- BGNXCDMCOKJUMV-UHFFFAOYSA-N Tert-Butylhydroquinone Chemical compound CC(C)(C)C1=CC(O)=CC=C1O BGNXCDMCOKJUMV-UHFFFAOYSA-N 0.000 claims description 8
- -1 fatty alcohol sulfate Chemical class 0.000 claims description 8
- 239000004250 tert-Butylhydroquinone Substances 0.000 claims description 8
- 235000019281 tert-butylhydroquinone Nutrition 0.000 claims description 8
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 7
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 7
- 230000003472 neutralizing effect Effects 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 abstract description 3
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 238000000137 annealing Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005202 decontamination Methods 0.000 description 4
- 230000003588 decontaminative effect Effects 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- 239000010949 copper Chemical group 0.000 description 3
- 238000002845 discoloration Methods 0.000 description 3
- 238000007605 air drying Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910000776 Common brass Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007794 irritation Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
- C23G1/103—Other heavy metals copper or alloys of copper
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
- C23G5/032—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing oxygen-containing compounds
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/005—Drying solid materials or objects by processes not involving the application of heat by dipping them into or mixing them with a chemical liquid, e.g. organic; chemical, e.g. organic, dewatering aids
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Molecular Biology (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a surface treatment method of a soft brass wire, which is characterized by comprising the following steps: 1) acid washing: placing the annealed soft brass wire into a pickling tank for pickling, wherein the pickling solution comprises the following components in percentage by mass: 2-10 wt% of sulfuric acid, 1.5-8 wt% of nitric acid and the balance of water; the pickling temperature is room temperature, and the pickling time is as follows: 1-15 min; 2) primary water washing: and cleaning the brass wire rod subjected to acid cleaning at room temperature. According to the invention, drying treatment is arranged after the brass wire is cleaned, the strong volatility of the organic solvent is utilized to accelerate the volatilization of water on the surface of the brass wire, the problem of water stain spots on the surface of the brass wire cleaned by a conventional process is avoided, and meanwhile, the antioxidant and the decontaminant added in the organic solvent can effectively prevent the brass wire from being soaked in waterThe surface is oxidized and discolored, the area of the water stain spots on the surface of the soft brass wire rod after surface treatment accounts for less than or equal to 3 percent, and the area of a single water stain spot is less than or equal to 0.2mm 2 And the surface quality requirement of customers on the soft brass wire is met.
Description
Technical Field
The invention belongs to the technical field of copper alloy, and particularly relates to a surface treatment method of a soft brass wire.
Background
The common brass wire is a copper-zinc binary alloy, has excellent cold and hot processing performance and is very widely applied. The brass wire rod is divided into a hard state, a semi-hard state and a soft state according to the supply state, hard state and semi-hard state finished products are usually directly provided for clients after cold deformation processing, soft state products are provided for clients after annealing, the surfaces of the brass wire rods after annealing have oxidation problems, the surfaces of the brass wire rods also have slight oxidation phenomenon after annealing is protected by reducing atmosphere, the control requirements of reducing gas protection annealing on protective gas quality, vacuum degree, furnace body sealing degree and the like are high, as long as one part is not well controlled, the surface of the wire rods after annealing often has oxidation and ash formation phenomenon, and most brass wire rod production enterprises still carry out acid cleaning on the soft state products after annealing. However, according to the existing surface cleaning process, after the wire rod is naturally dried, water stain spots can be generated on the surface of the wire rod, and even if air drying or even drying is adopted, the water stain spots cannot be well eliminated. The presence of water spots makes the soft brass wire products unable to meet the customer's requirements for surface quality.
The invention provides a surface treatment method for improving water stain spots on the surface of a soft brass wire aiming at the problems.
Disclosure of Invention
The invention provides a surface treatment method of a soft brass wire rod, and solves the technical problem of improving surface water stain spots of the soft brass wire rod.
The technical scheme adopted by the invention for solving the technical problems is as follows: a surface treatment method of a soft brass wire is characterized by comprising the following steps:
1) acid washing: placing the annealed soft brass wire into a pickling tank for pickling, wherein the pickling solution comprises the following components in percentage by mass: 2-10 wt% of sulfuric acid, 1.5-8 wt% of nitric acid and the balance of water; the pickling temperature is room temperature, and the pickling time is as follows: 1-15 min;
2) primary water washing: cleaning the brass wire rod subjected to acid cleaning at room temperature;
3) neutralizing: soaking the brass wire rod in the saponification solution for 1-5 min, wherein the mass concentration of the saponification solution is as follows: 1-5%, wherein the saponification liquid contains 1-2 wt% of fatty alcohol sulfate and 2-5 wt% of sodium metasilicate pentahydrate, and the temperature of the saponification liquid is lower than 50 ℃;
4) and (3) secondary water washing: cleaning the neutralized brass wire at room temperature;
5) and (3) drying treatment: soaking the brass wire in an organic solvent, wherein the organic solvent comprises the following components in percentage by weight: the concentration (v/v) of ethyl acetate is more than or equal to 70%, 1-10 mg/L benzotriazole, 0.5-3 mg/L dilauryl thiodipropionate, 0.1-2 mg/L tert-butylhydroquinone, 0.1-1 mg/L dodecyl mercaptan and the balance of water; the brass wire rod is soaked in an organic solvent for 10-60 seconds, and the temperature of the organic solvent is controlled to be 40-60 ℃.
The saponification liquid is added with fatty alcohol sulfate and sodium metasilicate pentahydrate, and the fatty alcohol sulfate is an anionic surfactant with excellent performance, has excellent decontamination performance and can remove oil stains attached to the surfaces of wires. Sodium metasilicate pentahydrate has good detergency, emulsifying, dispersing, wetting and penetrating performances, and the temperature of the saponification liquid is required to be lower than 50 ℃, because the fatty alcohol sulfate can be decomposed at the temperature of more than 50 ℃ to reduce the detergency.
Ethyl acetate: the solvent is an organic solvent with excellent volatility and no toxicity, can dissolve grease on the surface of a product, and simultaneously has the volatility to accelerate the air drying speed, take away water and reduce the retention of water stains on the surface. The concentration of the ethyl acetate is not lower than 70% (v/v), the higher the concentration is, the better the effect of volatilizing and carrying away water is, the lower the concentration is, and water stain spots are still easy to appear on the surface of the wire rod after volatilization;
benzotriazole (BTA): benzotriazole and Cu atoms form covalent bonds and coordination bonds to form a chain polymer, a continuous film is formed on the surface of a brass wire, a copper matrix is isolated from the environment, aggressive ions are prevented from reaching the surface of copper, and the effect of preventing oxidation discoloration is achieved; the content of the benzotriazole is lower than 1mg/L, a complex protective film cannot be formed on the surface of the copper wire, the content exceeds 10mg/L, and poor electroplating of the copper wire is easy to occur, so that the content range of the benzotriazole needs to be controlled to be 1-10 mg/L.
Dilauryl thiodipropionate: the wire rod and the benzotriazole generate a synergistic effect, so that the corrosion resistance and oxidation resistance of the benzotriazole are further enhanced, and the finished wire rod is kept from oxidative discoloration for a period of time. In the invention, the content of dilauryl thiodipropionate is in the range of 0.5-3 mg/L, and the dilauryl thiodipropionate is too low to play a role in enhancing oxidation resistance, so that the content is high and the cost is increased.
Tert-butyl hydroquinone: the copper wire has strong oxidation resistance and a certain antibacterial effect, prevents the surface of the wire from being oxidized and mildewed when exposed to the air, has a synergistic effect on other antioxidants such as benzotriazole, but the addition amount of the tert-butyl hydroquinone needs to be strictly controlled, when the content exceeds 2mg/L, the surface color of the copper wire is easy to generate a redness phenomenon, and the content is lower than 0.1mg/L, so that the oxidation resistance effect cannot be realized. Therefore, the reasonable content range in the invention is as follows: 0.1-2 mg/L.
Dodecyl mercaptan: the wire cleaning agent has a good decontamination effect, plays a role in cleaning the surface of a wire, has a good decontamination effect when the content is higher, is lower than 0.1mg/L, has a poor decontamination effect and an overhigh content, has irritation to the skin and eyes of an operator, and needs to strictly control the upper limit and cannot exceed 1 mg/L.
Preferably, hot water cleaning is arranged between the step 3) and the step 4), specifically, the brass wire is soaked in hot water for 30-180 s, the temperature of the hot water is not lower than 70 ℃, and the brass wire is taken out and naturally dried in the air. The purpose is to accelerate the volatilization of the water on the surface of the brass wire rod by utilizing the heat of hot water.
Preferably, the area of the water stain spots on the surface of the soft brass wire rod after surface treatment accounts for less than or equal to 3 percent, and the area of a single water stain spot is less than or equal to 0.2mm 2 。
Compared with the prior art, the invention has the advantages that: according to the invention, drying treatment is carried out after brass wires are cleaned, the strong volatility of an organic solvent is utilized to accelerate the volatilization of water on the surfaces of the brass wires, the problem that water spots appear on the surfaces of the brass wires cleaned by a conventional process is solved, meanwhile, antioxidants and detergents added into the organic solvent can effectively prevent the surfaces of the brass wires from oxidative discoloration, the ratio of the water spot area of the surfaces of the brass wires subjected to surface treatment to the water spots is less than or equal to 3%, and the area of a single water spot is less than or equal to 0.2mm 2 And the surface quality requirement of customers on the soft brass wire rods is met.
Drawings
FIG. 1 is a photograph of a brass wire rod in example 1 of the present invention.
FIG. 2 is a photograph of a brass wire rod of comparative example 1 of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The invention provides 3 examples and 1 comparative example, the specific components are shown in Table 1.
Example 1:
a soft brass wire rod with the specification of phi 3.8mm and the surface treatment method comprises the following steps:
1) acid washing: after the annealed wire is loosened, the wire is put into a pickling tank for pickling, and the ratio of pickling solution is as follows: sulfuric acid: 8.6 wt%, nitric acid: 2.2 wt%, water as the rest, acid washing temperature: pickling at room temperature for 1 min;
2) primary water washing: soaking the wire rod after acid washing in a clean water tank for 20 seconds, and then washing with high-pressure tap water for 30 seconds at room temperature;
3) neutralizing: soaking in saponification solution for 1.5min, wherein the concentration of saponification solution is as follows: 2.9 wt%, the addition amount of fatty alcohol sulfate is 1.2 wt%, the addition amount of sodium metasilicate pentahydrate is 2.3 wt%, and the temperature of the saponification liquid is room temperature;
4) and (3) secondary water washing: washing the neutralized wire with room temperature clear water (pH 6.4);
5) and (3) hot water cleaning: soaking the wire rod in a hot water tank for about 30s at the hot water temperature of 84 ℃, and taking out and naturally drying;
6) and (3) drying treatment: soaking the wire rod after washing in an organic solvent for 30 seconds, wherein the organic solvent comprises the following components in percentage by weight: ethyl acetate: 95 v/v%, benzotriazole: 2mg/L, dilauryl thiodipropionate: 1.2mg/L, tert-butylhydroquinone: 0.6mg/L, dodecyl mercaptan: 0.3mg/L, the balance being water, the temperature of the organic solvent being 47 ℃;
7) and (3) inspecting and packaging: the water stain spots are detected on the surface of the finished wire rod, the area of the water stain spots accounts for 1.7 percent, and the area of each single water stain spot is 0.12mm at most 2 And packaging the qualified product by using a self-sealing film.
Example 2:
a soft brass wire rod with the specification of phi 6.0mm and the surface treatment method comprises the following steps:
1) acid washing: after the annealed wire is loosened, the wire is put into a pickling tank for pickling, and the ratio of pickling solution is as follows: sulfuric acid: 9.3 wt%, nitric acid: 1.9 wt%, water as the rest, pickling temperature: pickling at room temperature for 0.5 min;
2) primary water washing: soaking the acid-washed wire rod in a clean water tank for 20 seconds, and then washing the wire rod by using high-pressure tap water for 20 seconds at room temperature;
3) neutralizing: soaking in saponification solution for 1min, wherein the concentration of the saponification solution is as follows: 2.5 wt%, the addition amount of fatty alcohol sulfate is 1.3 wt%, the addition amount of sodium metasilicate pentahydrate is 2.7 wt%, and the temperature of the saponification liquid is room temperature;
4) and (3) secondary water washing: washing the neutralized wire with room temperature clear water (pH 6.8);
5) and (3) hot water cleaning: soaking the wire rod in a hot water tank for 30s at the temperature of 90 ℃, and taking out and naturally drying;
6) and (3) drying treatment: soaking the wire rod after being washed in water in an organic solvent for 20S, wherein the proportion of the organic solvent is as follows: ethyl acetate: 78 v/v%, benzotriazole: 1.8mg/L, dilauryl thiodipropionate: 1.1mg/L, tert-butylhydroquinone: 0.4mg/L, dodecyl mercaptan: 0.2mg/L, the balance being water, the solution temperature being 43 ℃;
7) and (3) inspecting and packaging: the water stain spots are detected on the surface of the finished wire rod, the area of the water stain spots accounts for 2.2 percent, and the area of the single water stain spot is 0.08mm at most 2 And packaging the qualified product by using a self-sealing film. Soaking the brass wire in an organic solvent, wherein the organic solvent comprises the following components in percentage by weight: the concentration (v/v) of ethyl acetate is more than or equal to 70%, 1-10 mg/L benzotriazole, 0.5-3 mg/L dilauryl thiodipropionate, 0.1-2 mg/L tert-butyl hydroquinone, 0.1-1 mg/L dodecyl mercaptan and the balance of water; the brass wire rod is soaked in an organic solvent for 10-60 seconds, and the temperature of the organic solvent is controlled to be 40-60 ℃.
Example 3:
a soft brass wire rod with the specification of phi 2.8mm and the surface treatment method comprises the following steps:
1) acid washing: after the annealed wire is loosened, the wire is put into a pickling tank for pickling, and the ratio of pickling solution is as follows: sulfuric acid: 10 wt%, nitric acid: 2.5 wt%, water as the rest, acid washing temperature: pickling at room temperature for 2 min;
2) primary water washing: soaking the acid-washed wire rod in a clean water tank for 40 seconds, and then washing the wire rod by using high-pressure tap water for 60 seconds at room temperature;
3) neutralizing: soaking in saponification solution for 3min, wherein the concentration of the saponification solution is as follows: 3.4 wt%, the addition amount of fatty alcohol sulfate is 2.2 wt%, the addition amount of sodium metasilicate pentahydrate is 1.9 wt%, and the temperature of the saponification liquid is room temperature;
4) and (3) secondary water washing: washing the neutralized wire with room temperature clear water (pH 6.2);
5) and (3) hot water cleaning: soaking the wire rod in hot water tank at 90 deg.C for 40s, and naturally drying;
6) and (3) drying treatment: soaking the wire rod after being washed in water in an organic solvent for 45S, wherein the formula of the organic solvent is as follows: 86% (v/v) ethyl acetate, 2.3mg/L benzotriazole, 1.5mg/L dilauryl thiodipropionate, 0.7mg/L tert-butylhydroquinone, 0.2mg/L dodecyl mercaptan and the balance of water, wherein the solution temperature is 47 ℃;
7) and (3) inspecting and packaging: the water stain spots are detected on the surface of the finished wire rod, the area of the water stain spots accounts for 0.9 percent, and the area of each water stain spot is 0.16mm at most 2 And packaging the qualified product by using a self-sealing film.
Comparative example 1:
a soft brass wire rod with the specification of phi 3.8mm and the surface treatment method comprises the following steps:
1) acid washing: after the annealed wire is loosened, the wire is put into a pickling tank for pickling, and the ratio of pickling solution is as follows: sulfuric acid: 8.6 wt%, nitric acid: 2.2 wt%, water as the rest, acid washing temperature: pickling at room temperature for 1 min.
2) Primary water washing: and (3) soaking the acid-washed wire in a clean water tank for about 20 seconds, and then washing the wire with high-pressure tap water for about 30 seconds at room temperature.
3) Neutralizing: soaking in saponification solution for 1.5min, wherein the concentration of saponification solution is as follows: 2.9 wt%, the temperature of the saponified solution was room temperature;
4) washing with water: washing the neutralized wire with normal temperature clear water (pH 6.4), and naturally drying in the air;
5) and (3) inspecting and packaging: the surface of the finished wire rod is inspected to detect water spots, the area of the water spots accounts for 15.4 percent, and the area of each single water spot is 6.6mm at most 2 And packaging the qualified product by using a self-sealing film.
TABLE 1 compositions and hardness of inventive examples and comparative examples
Claims (3)
1. A surface treatment method of a soft brass wire is characterized by comprising the following steps:
1) acid washing: placing the annealed soft brass wire into a pickling bath for pickling, wherein the pickling bath comprises the following components in percentage by mass: 2-10 wt% of sulfuric acid, 1.5-8 wt% of nitric acid and the balance of water; the pickling temperature is room temperature, and the pickling time is as follows: 1-15 min;
2) primary water washing: cleaning the brass wire rod subjected to acid cleaning at room temperature;
3) neutralizing: soaking the brass wire rod in the saponification solution for 1-5 min, wherein the mass concentration of the saponification solution is as follows: 1-5%, wherein the saponification liquid contains 1-2 wt% of fatty alcohol sulfate and 2-5 wt% of sodium metasilicate pentahydrate, and the temperature of the saponification liquid is lower than 50 ℃;
4) and (3) secondary water washing: cleaning the neutralized brass wire at room temperature;
5) and (3) drying treatment: soaking the brass wire in an organic solvent, wherein the organic solvent comprises the following components in percentage by weight: the concentration (v/v) of ethyl acetate is more than or equal to 70%, 1-10 mg/L benzotriazole, 0.5-3 mg/L dilauryl thiodipropionate, 0.1-2 mg/L tert-butyl hydroquinone, 0.1-1 mg/L dodecyl mercaptan and the balance of water; the brass wire rod is soaked in an organic solvent for 10-60 seconds, and the temperature of the organic solvent is controlled to be 40-60 ℃.
2. The surface treatment method of a soft brass wire rod according to claim 1, characterized in that: and (3) hot water cleaning is arranged between the step 3) and the step 4), specifically, the brass wire rod is soaked in hot water for 30-180 s, the temperature of the hot water is not lower than 70 ℃, and the brass wire rod is taken out and naturally dried in the air.
3. The surface treatment method of a soft brass wire rod in accordance with any one of claims 1 to 2, characterized in that: the area of the water stain spots on the surface of the soft brass wire rod after surface treatment accounts for less than or equal to 3 percent, and the area of a single water stain spot is less than or equal to 0.2mm 2 。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210412473.7A CN114908354B (en) | 2022-04-19 | 2022-04-19 | Surface treatment method for soft brass wire |
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|---|---|---|---|
| CN202210412473.7A CN114908354B (en) | 2022-04-19 | 2022-04-19 | Surface treatment method for soft brass wire |
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| CN114908354B CN114908354B (en) | 2024-02-09 |
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Citations (12)
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