CN115418523B - Corrosion-resistant brass and preparation method thereof - Google Patents

Corrosion-resistant brass and preparation method thereof Download PDF

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CN115418523B
CN115418523B CN202211060650.6A CN202211060650A CN115418523B CN 115418523 B CN115418523 B CN 115418523B CN 202211060650 A CN202211060650 A CN 202211060650A CN 115418523 B CN115418523 B CN 115418523B
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brass
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smelting
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CN115418523A (en
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叶东皇
傅杰
华称文
张宝
瞿福水
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Ningbo Jintian Copper Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • C22C9/04—Alloys based on copper with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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    • Y02P10/20—Recycling

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Abstract

The invention discloses corrosion-resistant brass, which is characterized by comprising the following components in percentage by mass: 63-65 wt%, sn:0.05 to 0.2 percent of Al:0.01 to 0.05 percent, B: 0.002-0.006%, RE:0.015 to 0.04 weight percent, less than or equal to 0.01 weight percent of Fe, less than or equal to 0.01 weight percent of Pb and the balance of zinc. The brass does not contain arsenic elements polluting the environment and affecting the health of human bodies, the dezincification corrosion of the brass is inhibited by adding trace tin, aluminum, boron and rare earth, a single alpha-phase structure is obtained, the corrosion resistance of the low-copper and arsenic-free brass is improved from a microstructure, the maximum dezincification layer depth of the brass is less than 300 mu m, and the brass can pass the 8-hour neutral salt spray test.

Description

Corrosion-resistant brass and preparation method thereof
Technical Field
The invention relates to the technical field of copper alloy, in particular to corrosion-resistant brass and a preparation method thereof.
Background
Brass is a binary alloy of copper and zinc, has excellent comprehensive performance and is very widely applied. Corrosion resistance is one of the important service properties of brass, and corrosion of brass mainly takes two forms: dezincification corrosion and stress corrosion, the corrosion of brass of the present invention is dezincification corrosion. In natural environment, the dezincification corrosion degree of brass is slow, in order to detect the dezincification corrosion resistance of brass, a salt spray test is usually carried out before the product leaves the factory, and the salt spray test is an artificial manufacturing corrosion environment for accelerating the corrosion of brass so as to detect the corrosion resistance of brass.
At present, the improvement of the corrosion resistance of the brass is solved by adding 0.02 to 0.06 percent of arsenic, and the arsenic element has a strong inhibition effect on the dezincification process, so that the arsenic-containing brass has good corrosion resistance. Although arsenic is added to brass, brass does not produce toxicity, but is due to arsenic oxide As 2 O 3 The arsenic-containing brass is toxic, pollutes the environment when being smelted, is harmful to human bodies, and is called arsenic color change by people, so that arsenic-containing brass products are refused in the market under the psychological implication, and therefore, arsenic-free corrosion-resistant brass needs to be developed.
Under the action of corrosive medium, zn on the surface of the brass is preferentially dissolved to generate vacancies from the brass because Zn is more active than Cu, then Zn in the alloy is continuously dissolved through vacancy diffusion, and copper with positive potential is left as a loose copper layer, so that the corrosion resistance of the brass is improved mainly by inhibiting dezincification corrosion of zinc.
The method for preventing dezincification corrosion of brass can be considered from the aspect of metallurgy and environment improvement. The corrosion environment is improved, cathodic protection, corrosion inhibitor addition, medium corrosiveness reduction and the like can be adopted, and due to the limitation of working conditions, the external measures cannot completely inhibit dezincification of brass, and the best method for preventing dezincification corrosion of brass is to improve the dezincification resistance of brass by a metallurgic method.
Dezincification corrosion of brass is mainly related to copper content, and is related to phase structure, grain size, surface treatment and the like of brass, and in addition, special microelements are added during alloy smelting, so that corrosion resistance of brass can be improved. However, increasing the copper content brings about an increase in the cost of raw materials, and the market has low acceptance for brass with high copper content, thus limiting the application.
Therefore, in order to solve the above problems, it is necessary to improve the existing arsenic-containing corrosion-resistant brass and improve the corrosion resistance of brass with lower copper content.
Disclosure of Invention
The invention aims to provide corrosion-resistant brass with low copper content and no arsenic content.
The second technical problem to be solved by the invention is to provide a preparation method of corrosion-resistant brass.
The invention solves the first technical problem by adopting the technical scheme that: the corrosion-resistant brass is characterized by comprising the following components in percentage by mass: 63-65 wt%, sn:0.05 to 0.2 percent of Al:0.01 to 0.05 percent, B: 0.002-0.006%, RE:0.015 to 0.04 weight percent, less than or equal to 0.01 weight percent of Fe, less than or equal to 0.01 weight percent of Pb and the balance of zinc.
Copper: it is known that the corrosion resistance of brass is improved along with the improvement of copper content, because zinc is more active than copper and is corroded first, so that the higher the copper content is, the better the corrosion resistance of brass is, but the improvement of copper content brings about the increase of raw material cost, and brass with low copper content and corrosion resistance is more easily accepted by the market; conversely, when the copper content is further reduced and is lower than 65%, beta phase appears in normal temperature tissues, along with the gradual reduction of the copper content, the beta phase is gradually increased, the zinc content of the beta phase is about 8% higher than that of the alpha phase, and the beta phase is not corrosion-resistant compared with the alpha phase, so that the corrosion resistance of the brass is reduced along with the increase of the beta phase, the corrosion resistance of the brass with the copper content lower than 65% is improved, the beta phase does not appear in the tissues, and after the copper content is lower than 63%, the increased beta phase in the tissues is difficult to eliminate by a process method, so that the corrosion-resistant brass has the copper content range of 63-65 wt%.
Tin: the addition of a small amount of tin in the brass can prevent dezincification and improve the corrosion resistance of the brass, and because the zinc equivalent coefficient of the tin is +4, after the tin content exceeds 0.2 percent, the beta phase in the structure is increased, and the dezincification corrosion resistance of the brass is reduced, therefore, the addition amount of the tin in the brass is controlled to be 0.05 to 0.2 percent.
Aluminum: after aluminum is dissolved in copper, al is formed on the surface of copper 2 O 3 The protective film prevents zinc from diffusing and losing, improves the oxidation resistance of copper, has no obvious influence on the mechanical property and the technological property of copper due to trace aluminum, and reduces the dezincification corrosion resistance of brass due to the fact that more beta is opposite in a tissue after the aluminum content exceeds 0.05%, so that the addition amount of the brass aluminum is controlled to be 0.01-0.05%.
Boron: the boron atoms can be filled in the grain boundary and the double vacancies, so that bonding force of the places is enhanced, zinc atoms are prevented from migrating through the double vacancies and the grain boundary, and in addition, the defect structure of the surface cuprous oxide is changed by adding boron, so that the cuprous oxide film is more uniform and compact and is not easy to erode. The optimum boron content is in the range of 0.002 to 0.006%, which is lower than the lower limit, and the effect is weak, and since boron atoms are accumulated at the grain boundaries, the grain boundary strength decreases with increasing boron content, and therefore the upper limit of boron content is preferably not more than 0.006%.
Iron: at 1050 ℃, the solubility of iron in copper is 3.5%, the solubility of iron in copper is reduced to 0.015% at 635 ℃, and the solubility of iron in copper is extremely low at normal temperature, so trace iron exists in a particle form in tin-phosphor bronze to play a role in refining grains, but the iron point has poor corrosion resistance and is easy to rust at first, so the iron content of the corrosion-resistant brass of the invention is required to be strictly controlled below 0.01%.
Lead: the Pb content of the brass alloy of the invention is less than or equal to 0.01wt percent, and belongs to lead-free brass.
RE: the rare earth forms a protective film on the interface of the matrix metal, prevents zinc atoms from diffusing and inhibits the dissolution of copper and zinc, so that the alloy structure is more compact, the precipitation of zinc atoms in the crystal lattice is blocked, and the dezincification corrosion resistance of the brass is improved. However, if the rare earth is excessively added, a large amount of rare earth compound is formed, and the alloy structure is rather deteriorated.
Preferably, the addition amounts of Sn and Al satisfy: w is 350-W Cu /W (Sn+Al) Not more than 1100, wherein W Cu Is composed of Cu and W (Sn+Al) The Sn-Al alloy is the sum of Sn and Al in percentage by mass.
Although the Sn and the Al elements can inhibit dezincification of the brass, the zinc equivalent coefficients of Sn and Al are +4, +6, the Sn and Al can increase the quantity of beta phases in a brass structure, the beta phases are increased, the dezincification corrosion resistance of the brass can be reduced, the content of the Sn and Al elements is improved, the content of Cu is correspondingly improved, the content of the Sn and Al elements is reduced, and the content of Cu can be correspondingly reduced, so that the side effect caused by adding the Sn and Al elements can be avoided, and the addition quantity of the Sn and the Al satisfies: w is 350-W Cu /W (Sn+Al) ≤1100。
Preferably, the phase structure of the brass is a single phase alpha phase, wherein the average grain size of the alpha phase is 10 to 20 μm. The single alpha phase structure improves the corrosion resistance of the low-copper arsenic-free brass, the corrosion resistance of the brass is related to the surface finish, the finish is related to the grain size of the brass besides the die, the smaller the grain size is, the smoother the surface of the brass after cold working is, but the smaller the grain size is, and the customer is easy to crack when the cold deformation degree is large during the processing of products. Therefore, the average grain size (i.e., the average grain size of the alpha phase) of the brass finished product of the present invention is controlled to be 10 to 20. Mu.m.
The invention solves the second technical problem by adopting the technical proposal that: a preparation method of corrosion-resistant brass is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
1) Smelting: proportioning the required raw materials, smelting in a smelting furnace, and smelting at the temperature: after 980-1030 ℃ is melted, alloy components are adjusted, after the components meet the requirements, the copper water of the smelting furnace is transferred into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 1020-1050 ℃;
2) Horizontal continuous casting: casting temperature: 1020-1050 ℃ and casting speed of 5-30 mm/s;
3) Extruding: the heating temperature of the cast ingot is 670-760 ℃ and the extrusion force is 7-28 MN;
4) Intermediate stretching and intermediate annealing: the extruded blank is stretched to a blank with a certain specification through multiple passes, intermediate annealing is arranged between the passes, the processing rate between adjacent intermediate annealing is controlled to be 20-50%, and the processing rate of the last stretch is not lower than 40%; annealing temperature: 450-580 ℃, and the temperature rise time is as follows: 30-60 min, the initial temperature is room temperature, and the heat preservation time is as follows: naturally cooling after discharging for 90-240 min;
5) And (5) bottom-leaving annealing: annealing temperature is 480-510 ℃, and heating time is as follows: 30-60 min, the initial temperature is room temperature, and the heat preservation time is as follows: the blank is quenched after being discharged from the furnace for 120-240 min, the time interval from discharging to water entering of the blank is controlled within 50s, and the water temperature is not more than 50 ℃;
7) And (3) stretching a finished product: obtaining the rod wire.
The processing rate between adjacent intermediate anneals is controlled to be 20-50%, when the processing rate is lower than 20%, the difference of work hardening of the outer layer and the inner layer of the blank is large, the recrystallized structure of the inner layer and the outer layer after annealing is uneven, the processing rate is too high, the stretching is easy to break, the production is unstable, the uniformity of the recrystallized structure of the bottom-left annealing is determined by considering the processing rate of the last stretching, and the larger the processing rate is, the more uniform the recrystallized grain size is, so the processing rate of the last stretching in the process is not lower than 40%.
The annealing temperature is 480-510 ℃, the blank is annealed in the bottom-reserving specification within the temperature range, the beta phase is prevented from being converted into the alpha phase, the time interval from the discharging of the blank to the water entering is controlled within 50 seconds, the water temperature is not more than 50 ℃, and the internal structure of the blank is ensured not to generate the beta phase after the bottom-reserving annealing.
In order to resist the erosion of air and water, and further improve the corrosion resistance, preferably, in the step 6), a lubricating oil is used in the stretching process, and the lubricating oil comprises the following components in percentage by mass: 20-40 wt% of petroleum sodium sulfonate: 4-7wt% of ethanolamine: 3 to 5 weight percent of fatty acid soap: 2 to 5 weight percent of benzotriazole: 0.1 to 0.2wt% and the balance being naphthenic oil.
Dimethicone: as one of main components of lubricating oil, can be completely mixed with naphthenic oil to further improve lubricity, and can form a layer of waterproof and mildew-proof film on the surface of a copper wire material to avoid moisture absorption and discoloration of the product in moist air, the content of dimethyl silicone oil is low to form a thin film, the content is more than that of the oil product to increase viscosity, copper powder falling off in the wire blank stretching process is not easy to separate from the oil product, and the proper content range in the invention is as follows: 20 to 40 weight percent.
Sodium petroleum sulfonate: as a supplement to the dimethyl silicone oil, the surfactant can be adsorbed on the surface of metal to form a protective film, has the properties of resisting moisture and salt mist corrosion, and can prevent the corrosion of the metal. The content of the lubricating oil is low, the effect is poor, the content exceeds 7%, the formed foam amount is large, heat dissipation can be influenced, and the oxidative deterioration of the lubricating oil is accelerated.
Ethanolamine: is a metal corrosion inhibitor, can absorb acid gas, has low content and poor effect, has high content of ammonia odor, has relatively bad odor of lubricating oil, and is properly added in an amount of 3-5 wt%.
Fatty acid soap: the anionic surfactant can remove black spots on the surface of the wire rod, has low content, poor effect and high content, increases the viscosity of lubricating oil, can influence wetting and heat dissipation, and is easy to cause filament flow on the surface after the wire rod is stretched.
Benzotriazole: the copper alloy corrosion inhibitor can prevent the oxidation discoloration of wires, the addition amount of the copper alloy corrosion inhibitor is 0.1 to 0.2 weight percent, the content is low, the effect is poor, the content exceeds more than 0.2 percent, and the slow release effect cannot be improved.
Naphthenic base oil: the natural saturated cyclic stable structure is used as one of main components of lubricating oil, and has good chemical stability, stable lubricating performance and smooth surface of the wire after being stretched.
Preferably, the surface of the rod-wire material is provided with an oil film having a thickness of 2 to 5 μm.
Compared with the prior art, the invention has the advantages that: the brass does not contain arsenic elements polluting the environment and affecting the health of human bodies, the dezincification corrosion of the brass is inhibited by adding trace tin, aluminum, boron and rare earth, a single alpha-phase structure is obtained, the corrosion resistance of the low-copper and arsenic-free brass is improved from a microstructure, the maximum dezincification layer depth of the brass is less than 300 mu m, and the brass can pass the 8-hour neutral salt spray test.
Drawings
FIG. 1 is a photograph (magnified 100 times) of a metallographic structure of example 1 of the present invention.
FIG. 2 is a photograph (magnified 100 times) of a metallographic structure of a comparative example of the present invention.
FIG. 3 is a photograph of the salt fog according to example 1 of the present invention.
FIG. 4 is a photograph of a comparative example of the present invention after salt fog.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
The invention provides 3 examples and 2 comparative examples, the specific compositions are shown in Table 1.
Example 1:
the corrosion-resistant brass bar has a diameter of 6.6mm and is prepared by the following steps:
1) Smelting: proportioning the required raw materials, smelting in a smelting furnace, and smelting at the temperature: after the alloy is melted at 1000-1030 ℃, the alloy components are adjusted, and after the components meet the requirements, the copper water of the smelting furnace is transferred into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 1020-1050 ℃.
2) Horizontal continuous casting: casting temperature: 1030-1050 ℃, the casting speed is 14mm/s, the diameter of the cast ingot is 245mm, and the sawing length is 600mm.
3) Extruding: the heating temperature of the cast ingot is 730 ℃, the heated cast ingot is extruded in a double-hole way on a 3150T extruder, the specification of an extrusion blank is phi 13mm, and the extrusion force is 21MN.
4) Intermediate stretching and intermediate annealing: the extrusion blank is stretched and peeled to phi 11.2mm, and is stretched and peeled to phi 9.6mm after the intermediate annealing and acid washing, and then is stretched to phi 7.3mm. Intermediate annealing temperature: 540 ℃, and the temperature rise time is as follows: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: and (5) taking the materials out of the furnace for natural cooling after 150 min.
5) And (5) bottom-leaving annealing: annealing in a pit furnace at 500 ℃ and heating time: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: 180min, water quenching after wire blank discharging, wherein the time interval from discharging to water entering of the wire blank is controlled to be 40s, and the water temperature is not more than 50 ℃;
7) And (3) stretching a finished product: before the finished product is stretched, peeling is carried out, the peeling amount is 0.018mm, the peeled blank is stretched to a bar with phi of 6.6mm, the stretching die is a polycrystalline die, and lubricating oil is used in the stretching process.
8) And (3) checking and packaging: and packaging after the finished product is inspected to be qualified.
Example 2:
the corrosion-resistant brass bar has a diameter of 5.8mm and is prepared by the following steps:
1) Smelting: proportioning the required raw materials, smelting in a smelting furnace, and smelting at the temperature: after 990-1020 ℃, alloy components are adjusted after melting, after the components meet the requirements, the molten copper in the smelting furnace is transferred into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 1020-1050 ℃.
2) Horizontal continuous casting: casting temperature: 1030-1050 ℃, the casting speed is 18mm/s, the diameter of the cast ingot is 195mm, and the sawing length is 650mm.
3) Extruding: the heating temperature of the cast ingot is 720 ℃, the heated cast ingot is subjected to double-hole extrusion on a 2200T extruder, the specification of an extrusion blank is phi 12.5mm, and the extrusion force is 16MN.
4) Intermediate stretching and intermediate annealing: the extrusion blank is stretched and peeled to phi 10.4mm, and is stretched and peeled to phi 8.5mm after the intermediate annealing and acid washing, and then is stretched to phi 6.5mm. Intermediate annealing temperature: 520 ℃, heating time: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: and (5) taking the materials out of the furnace for natural cooling after 180 minutes.
5) And (5) bottom-leaving annealing: annealing in a pit furnace, wherein the annealing temperature is 490 ℃ and the heating time is as follows: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: 180min, water quenching after wire blank discharging, wherein the time interval from discharging to water entering of the wire blank is controlled to be 45s, and the water temperature is not more than 50 ℃;
7) And (3) stretching a finished product: before the finished product is stretched, peeling is carried out, the peeling amount is 0.016mm, the peeled blank is stretched to a bar with phi of 5.8mm, the stretching die is a polycrystalline die, and lubricating oil is used in the stretching process.
8) And (3) checking and packaging: and packaging after the finished product is inspected to be qualified.
Example 3:
the corrosion-resistant brass bar has a diameter of 4mm and is prepared by the following steps:
1) Smelting: proportioning the required raw materials, smelting in a smelting furnace, and smelting at the temperature: after the alloy is melted at 1010-1040 ℃, the alloy components are adjusted, and after the components meet the requirements, the copper water of the smelting furnace is transferred into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 1020-1050 ℃.
2) Horizontal continuous casting: casting temperature: 1030-1050 ℃, the casting speed is 22mm/s, the diameter of the cast ingot is 145mm, and the sawing length is 500mm.
3) Extruding: the heating temperature of the cast ingot is 710 ℃, the heated cast ingot is extruded in double holes on a 1250T extruder, the specification of an extrusion blank is phi 8.5mm, and the extrusion force is 9MN.
4) Intermediate stretching and intermediate annealing: the extrusion blank is stretched and peeled to phi 7mm, and is stretched and peeled to phi 6mm after the intermediate annealing and acid washing, and then is stretched to phi 4.5mm. Intermediate annealing temperature: 540 ℃, and the temperature rise time is as follows: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: and (5) taking the materials out of the furnace for natural cooling after 150 min.
5) And (5) bottom-leaving annealing: annealing in a pit furnace, wherein the annealing temperature is 480 ℃, and the heating time is as follows: 40min, the initial temperature is room temperature, and the heat preservation time is as follows: 180min, water quenching after wire blank discharging, wherein the time interval from discharging to water entering of the wire blank is controlled to be 40s, and the water temperature is not more than 50 ℃;
7) And (3) stretching a finished product: before the finished product is stretched, peeling is carried out, the peeling amount is 0.016mm, the peeled blank is stretched to a bar with phi of 5.8mm, the stretching die is a polycrystalline die, and lubricating oil is used in the stretching process.
8) And (3) checking and packaging: and packaging after the finished product is inspected to be qualified.
Comparative example 1: commercial H65 brass bars were 6.6mm in diameter.
Comparative example 2: commercial arsenic-containing C46500 brass rods were 6.6mm in diameter.
The following microstructure and corrosion resistance tests were performed on the obtained examples and comparative examples, and specific data are shown in tables 3 and 4.
Grain size measurement: the preparation of the metallographic samples of 3 examples and 2 comparative examples is carried out according to the specification of GB/T13298, the grain size measurement is carried out according to the comparative method specified in GB/T6394-2017 (metal average grain size determination method), i.e.the grain size is assessed by comparison with a standard rating scale.
Beta phase area ratio: and (5) carrying out automatic quantitative analysis by using metallographic analysis software.
Test of dezincification resistance: the dezincification resistance of the material was evaluated by maximum dezincification depth, and 3 examples and 1 comparative example samples were measured for maximum dezincification depth according to GB/T10119-2008 test for dezincification corrosion resistance of Brass, 6 th and 7 th.
Salt spray corrosion resistance test: the salt spray comparative test was carried out according to GB/T10125-2012 (salt spray test for artificial atmosphere corrosion test) test method (neutral salt spray test method) simultaneously with 2 comparative sample, and the test conditions are as follows: temperature: 35.+ -. 2 ℃ and PH value: 6.5-7.2, salt mist concentration: and 5% NaCl solution, wherein the test time is 8 hours, taking out the sample after the test is finished, and visually observing the corrosion degree and the color change condition after washing and drying to judge the corrosion resistance effect. The surface is only slightly discolored, and no macroscopic pitting corrosion appears, which indicates that the salt spray corrosion resistance is good.
TABLE 1 chemical compositions of examples and comparative examples of the present invention
Figure BDA0003825881070000081
TABLE 2 composition of lubricating oils in examples of the present invention
Figure BDA0003825881070000082
TABLE 3 metallographic structure of examples and comparative examples of the present invention
Numbering device Alpha phase average grain size/. Mu.m Beta phase area ratio/%
Example 1 15.5 0
Example 2 12.7 0
Example 3 18.0 0
Comparative example 1 45.2 8.20
Comparative example 2 33.7 26.8
TABLE 4 dezincification resistance and salt spray resistance of examples and comparative examples of the present invention
Figure BDA0003825881070000083
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Claims (5)

1. The corrosion-resistant brass is characterized by comprising the following components in percentage by mass: 63-65 wt%, sn: 0.05-0.2%, al: 0.01-0.05%, B: 0.002-0.006%, RE: 0.015-0.04 wt% of Fe less than or equal to 0.01wt%, pb less than or equal to 0.01wt% and the balance of zinc, wherein the phase structure of the brass is single-phase alpha phase, and the addition amount of Sn and Al satisfies the following conditions: w is 350-W Cu / W （Sn+Al） Not more than 1100, wherein W Cu Is composed of Cu and W （Sn+Al） The Sn-Al alloy is the sum of Sn and Al in percentage by mass.
2. The corrosion resistant brass of claim 1, wherein the average grain size of the alpha phase is 10-20 μm.
3. A method of producing a corrosion resistant brass according to claim 1 or 2, characterized in that: the preparation method comprises the following preparation steps:
1) Smelting: proportioning the required raw materials, smelting in a smelting furnace, and smelting at the temperature: after 980-1030 ℃ is melted, alloy components are adjusted, after the components meet the requirements, molten copper in a smelting furnace is transferred into a heat preservation furnace, and the temperature of the heat preservation furnace is controlled at 1020-1050 ℃;
2) Horizontal continuous casting: casting temperature: 1020-1050 ℃ and casting speed of 5-30 mm/s;
3) Extruding: the heating temperature of the cast ingot is 670-760 ℃, and the extrusion force is 7-28 MN;
4) Intermediate stretching and intermediate annealing: stretching the extruded blank to a blank with a certain specification through multiple passes, setting intermediate annealing between the passes, controlling the processing rate between adjacent intermediate annealing at 20-50%, and controlling the processing rate of the last stretching to be not lower than 40%; annealing temperature: 450-580 ℃, and the temperature rise time is as follows: 30-60 min, the initial temperature is room temperature, and the heat preservation time is as follows: naturally cooling after discharging for 90-240 min;
5) And (5) bottom-leaving annealing: annealing temperature is 480-510 ℃, and heating time is as follows: 30-60 min, the initial temperature is room temperature, and the heat preservation time is as follows: 120-240 min, quenching the blank after discharging from the furnace, wherein the time interval from discharging to water entering of the blank is controlled within 50s, and the water temperature is not more than 50 ℃;
6) And (3) stretching a finished product: obtaining the rod wire.
4. A method of producing corrosion resistant brass according to claim 3, wherein: in the step 6), lubricating oil is used in the stretching process, and the lubricating oil comprises the following components in percentage by mass: 20-40 wt% of petroleum sodium sulfonate: 4-7wt% of ethanolamine: 3-5wt% of fatty acid soap: 2-5wt% of benzotriazole: 0.1 to 0.2wt% of a naphthenic oil.
5. The method for preparing corrosion-resistant brass according to claim 4, wherein: and an oil film with the thickness of 2-5 mu m is attached to the surface of the rod wire.
CN202211060650.6A 2022-08-31 2022-08-31 Corrosion-resistant brass and preparation method thereof Active CN115418523B (en)

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