CN102703753A - Low-cost, anticorrosive, environment-friendly and free-cutting brass and preparation method thereof - Google Patents
Low-cost, anticorrosive, environment-friendly and free-cutting brass and preparation method thereof Download PDFInfo
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- CN102703753A CN102703753A CN2012102267677A CN201210226767A CN102703753A CN 102703753 A CN102703753 A CN 102703753A CN 2012102267677 A CN2012102267677 A CN 2012102267677A CN 201210226767 A CN201210226767 A CN 201210226767A CN 102703753 A CN102703753 A CN 102703753A
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Abstract
The invention relates to the technical field of alloy materials, in particular to low-cost, anticorrosive, environment-friendly and free-cutting brass and a preparation method thereof. The prior art has the problems of high price, high processing cost and unsatisfactory cutting performance. For solving the problems in the prior art, the invention adopts the technical scheme that the low-cost, anticorrosive, environment-friendly and free-cutting brass is 60Cu-Zn-Si-Al-Mg-Ti alloy and contains 60 to 62 percent of Cu, 0.5 to 1 percent of Si, 1.5 to 2 percent of Mg, 2.0 to 2.4 percent of Al, 0.05 to 0.1 percent of Ti and the balance of Zn and impurities of which the total amount is not more than 0.05 percent. The alloy has excellent performance, the advantages of silicon brass and magnesium brass in the conventional invention are integrated, and the alloy has high strength and hardness and excellent mechanical property, cutting performance and casting performance.
Description
Technical field:
The present invention relates to technical field of alloy material, be specifically related to a kind of low-cost corrosion-resistant environment-protective free-cutting brass and preparation method thereof.
Background technology:
The tradition leaded brass is on the basis of copper and zinc alloy, in brass, adds lead, has the multicomponent alloy of HS and good cold-forming property.Leaded brass is widely used in each manufacturing field with its excellent processability, free cutting property and corrosion resistance nature.But lead is a kind of harmful element, and Lead contamination is to influence one of important source of pollution of human body and environment.The pollution that Along with people's growth in the living standard and industry manufacturing are caused is to the infringement of health of people; Increasing people has recognized the importance of environmental protection; And limit the usage quantity of objectionable impurities in the world with law, rules, to improve environmental protection, guarantee the Sustainable development of industry.Countries such as European Union, the U.S., China have proposed the government of lead-containing alloy is ordered within a certain time in succession, so the application of lead-containing alloy faces strict restriction.
The domestic importance of recognizing the research Lead free cutting copper alloys very early of China.The Wang Zhijun of the bright group in sea, Zhang Tianli etc. explore with bismuth and replace the lead in the leaded brass; The alloying constituent of announcing in applying for a patent is copper (Cu) 57.0%-63.0%, bismuth (Bi) 0.1-3.5%, iron (Fe)≤0.5%; Tin (Sn)≤0.5%, all the other are that zinc (Zn) and total amount are not more than 0.05% impurity.Bi in the composition and Sn are heavy non-ferrous metal.Ningbo Bo Wei group has also carried out a series of researchs to non-leaded easily-cutting brass; Apply for a patent that (Cu 45.0%～60.0% for easy cutting high manganese copper content alloy; Mn 30.1%～36.0%, and Al 0.5%～2.3%, and Ni 0.5%～2.0%; Pb 0.3%～2.8%; P 0.01%～0.10 %, the Zn surplus) and free machining lead-free anti-corrosion brass alloy (copper: 57～64wt%, bismuth: 0.6～2.5wt%, boron: 0.0003～0.025wt%, manganese: 0.01～0.2wt% and antimony: 0.002～0.02wt%, Zn surplus); Still contain little amounts of Pb in the easy cutting high manganese copper content alloy composition, bismuth and antimony are heavy non-ferrous metal in the free machining lead-free anti-corrosion brass alloy composition.
The problem that above-mentioned alloy exists is: contain heavy non-ferrous metal in the starting material, be not easy to obtain, and cost an arm and a leg; Need special producing apparatus, increased tooling cost; Cutting ability still not as leaded brass, influences its effect.
Summary of the invention:
The present invention will provide a kind of low-cost corrosion-resistant environment-protective free-cutting brass and preparation method thereof, with costing an arm and a leg of overcoming that prior art exists, tooling cost height and the dissatisfactory problem of cutting ability.
A kind of low-cost corrosion-resistant environment-protective free-cutting brass is the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu60-62%, Si0.5-1%, and Mg1.5-2%, Al2.0-2.4%, Ti0.05-0.1%, all the other are not more than 0.05% impurity for Zn and total amount.
A kind of low-cost corrosion-resistant environment-protective free-cutting brass is the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu60%, Si1%, and Mg1.5%, Al2.4%, Ti0.05%, all the other are not more than 0.05% impurity for Zn and total amount.
The preparation method of above-mentioned low-cost corrosion-resistant environment-protective free-cutting brass is: the test material therefor comprises; The electrolysis copper coin of purity 99.99%; Pure magnesium, aluminium foil, pure zinc ingot, HIGH-PURITY SILICON, fine aluminium, Ti be with the Al-Ti alloy form, the insulating covering agent of charcoal during as melting, concrete steps are following: one, according to design of alloy cut, weighing; Plumbago crucible is heated to 680 ± 5 ℃; Two, spread one deck charcoal at the plumbago crucible bottom before for the first time reinforced, silicon, zinc, copper are put into plumbago crucible successively, and silicon is placed on least significant end; Three, when observing silicon and thoroughly melt, the temperature in the stove is raised to 1090 ± 5 ℃, continues heating; Secondary charging when observing copper and melt fully, because the burning-point of magnesium is lower, burning easily; And produce " flame " phenomenon; So magnesium and alterant are wrapped up with aluminium foil, together be pressed in the alloy liquid, spread one deck charcoal insulating covering agent; Four, treat that magnesium and alterant melt the back fully and add the reductor phosphor-copper, furnace is risen to 1175 ± 5 ℃, be incubated 10 minutes; Five, skim to come out of the stove and pour into a mould: the metal type dies preheating temperature is 400-450 ℃, with preparation newly the Zinc oxide water glass solution be coated on the mould inner surface, thermal treatment process is 670 ± 5 ℃ of solid solutions 3 hours, behind the oil quenching 270 ℃ of timeliness 1 hour.
Present technique is prone to cutting principle with leaded brass and is the basis; Aluminium, silicon, magnesium elements with trace substitute deleterious lead element; Science through to alterant is selected and process optimization, adopts conventional cast technology to obtain the more excellent 60Cu-Zn-Si-Al-Mg-Ti alloy of performance.Compare with prior art, advantage of the present invention is:
(1) composition of alloy is simple, only added Si, Al, Mg, four kinds of elements of Ti, and the consumption of Ti seldom; Be to get in the alloy (do not use pure titanium, pure titanium costs an arm and a leg) through master alloy Al-Ti, used Al, Mg are the most frequently used light non-ferrous metal; Used Si very easily obtains low price for commonly used nonmetal; Simultaneously do not contain any heavy non-ferrous metal, precious metal or poisonous element, can not damage human body.
(2) preparation technology is simple, adopts ordinary casting method, and is low for equipment requirements, uses common melting equipment to get final product.
(3) alloy property of the present invention's proposition is excellent; Combine the advantage of silicon brass and magnesium brass in the existing invention, this alloy has high intensity, hardness, and mechanical property, cutting ability and castability excellence: room temperature tensile strength reaches 522MPa; Unit elongation reaches 6.78%, at 1.0%CuCl
2In the solution corrosion after 24 hours the dezincify layer thickness be merely 131 μ m, the mobile length of spiral reaches 93cm, machinability good (suitable with HPb59-1).
Description of drawings:
Fig. 1 is 60Cu-Zn-Si-Al-Mg-Ti heat treatment of alloy attitude metallographic structure figure;
Fig. 2 is the dezincify layer thickness (MV is 131 μ m) of 60Cu-Zn-Si-Al-Mg-Ti alloy;
Fig. 3 is the spiral fluidity testing (93cm) of 60Cu-Zn-Si-Al-Mg-Ti alloy;
Fig. 4 is the smear metal pattern of 60Cu-Zn-Si-Al-Mg-Ti alloy.
Embodiment:
To combine embodiment that the present invention is at length explained below.
Embodiment 1, a kind of low-cost corrosion-resistant environment-protective free-cutting brass are the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu60%, Si1%, and Mg1.5%, Al2.4%, Ti0.05%, all the other are not more than 0.05% impurity for Zn and total amount.
Embodiment 2, a kind of low-cost corrosion-resistant environment-protective free-cutting brass are the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu62%, Si0.5%, and Mg2%, Al2.0%, Ti0.1%, all the other are not more than 0.05% impurity for Zn and total amount.
Embodiment 3, a kind of low-cost corrosion-resistant environment-protective free-cutting brass are the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu60%, Si0.5%, and Mg2%, Al2.4%, Ti0.05%, all the other are not more than 0.05% impurity for Zn and total amount.
Embodiment 4, a kind of low-cost corrosion-resistant environment-protective free-cutting brass are the 60Cu-Zn-Si-Al-Mg-Ti alloy, and its component content is Cu62%, Si1%, and Mg1.5%, Al2.2%, Ti0.08%, all the other are not more than 0.05% impurity for Zn and total amount.
The preparation method of embodiment 1-4 is: the test material therefor comprises; The electrolysis copper coin of purity 99.99%; Pure magnesium, aluminium foil, pure zinc ingot, HIGH-PURITY SILICON, fine aluminium, Ti be with the Al-Ti alloy form, the insulating covering agent of charcoal during as melting, concrete steps are following: one, according to design of alloy cut, weighing; Plumbago crucible is heated to 680 ± 5 ℃; Two, spread one deck charcoal at the plumbago crucible bottom before for the first time reinforced, silicon, zinc, copper are put into plumbago crucible successively, and silicon is placed on least significant end; Three, when observing silicon and thoroughly melt, the temperature in the stove is raised to 1090 ± 5 ℃, continues heating; Secondary charging when observing copper and melt fully, because the burning-point of magnesium is lower, burning easily; And produce " flame " phenomenon; So magnesium and alterant are wrapped up with aluminium foil, together be pressed in the alloy liquid, spread one deck charcoal insulating covering agent; Four, treat that magnesium and alterant melt the back fully and add the reductor phosphor-copper, furnace is risen to 1175 ± 5 ℃, be incubated 10 minutes; Five, skim to come out of the stove and pour into a mould: the metal type dies preheating temperature is 400-450 ℃, with preparation newly the Zinc oxide water glass solution be coated on the mould inner surface, thermal treatment process is 670 ± 5 ℃ of solid solutions 3 hours, behind the oil quenching 270 ℃ of timeliness 1 hour.
In the foregoing description, be most preferred embodiment with embodiment 1, its experiment presentation of results is following:
Referring to Fig. 1, can find out among the figure:
60Cu-Zn-Si-Al-Mg-Ti alloy heat treatment state tissue is by the matrix β phase and the second γ phase composite mutually, and the γ at crystal boundary place is almost completely dissolving mutually, the crystal boundary refinement; γ mainly is distributed in the matrix mutually, and β phase grain-size is about 70 μ m.
Referring to Fig. 2, can find out among the figure:
Corrosion layer and base layer interface present concavity and convexity, and dezincify layer maximum ga(u)ge is 154 μ m, and there is not the crack in mean thickness 131 μ m in the layer, explain that the dezincify layer is stable.And the dezincify layer MV of leaded brass is 300 μ m.The dezincify layer of 60Cu-Zn-Si-Al-Mg-Ti alloy is obviously lower, explains that it has better solidity to corrosion.
Referring to Fig. 3, can find out among the figure:
The spiral specimen length of 60Cu-Zn-Si-Al-Mg-Ti alloy reaches 930mm, and the spiral length of flow of leaded brass is generally 900mm, explains that the 60Cu-Zn-Si-Al-Mg-Ti alloy has better flowability.
Referring to Fig. 4, can find out among the figure:
The cutting swarf pattern of 60Cu-Zn-Si-Al-Mg-Ti alloy mainly is made up of the spirrillum smear metal, and mean length is about 2-8mm.Because the spirrillum smear metal is superior to block smear metal, sheet smear metal, this explanation 60Cu-Zn-Si-Al-Mg-Ti alloy has good machinability.
Claims (3)
1. low-cost corrosion-resistant environment-protective free-cutting brass, it is characterized in that: be the 60Cu-Zn-Si-Al-Mg-Ti alloy, its component content is Cu60-62%; Si0.5-1%, Mg1.5-2%, Al2.0-2.4%; Ti0.05-0.1%, all the other are not more than 0.05% impurity for Zn and total amount.
2. according to the said a kind of low-cost corrosion-resistant environment-protective free-cutting brass of claim 1, it is characterized in that: be the 60Cu-Zn-Si-Al-Mg-Ti alloy, its component content is Cu60%; Si1%, Mg1.5%, Al2.4%; Ti0.05%, all the other are not more than 0.05% impurity for Zn and total amount.
3. the method for manufacture of a kind of according to claim 1 or claim 2 low-cost corrosion-resistant environment-protective free-cutting of manufacturing brass; It is characterized in that: said method is: the test material therefor comprises, the electrolysis copper coin of purity 99.99%, and pure magnesium, aluminium foil, pure zinc ingot, HIGH-PURITY SILICON, fine aluminium, Ti are with the Al-Ti alloy form; The insulating covering agent of charcoal during as melting; Concrete steps are following: one, according to design of alloy cut, weighing, plumbago crucible is heated to 680 ± 5 ℃, two, spread one deck charcoal at the plumbago crucible bottom before for the first time reinforced; Silicon, zinc, copper are put into plumbago crucible successively, and silicon is placed on least significant end; Three, when observing silicon and thoroughly melt, the temperature in the stove is raised to 1090 ± 5 ℃, continues heating; Secondary charging when observing copper and melt fully, because the burning-point of magnesium is lower, burning easily; And produce " flame " phenomenon; So magnesium and alterant are wrapped up with aluminium foil, together be pressed in the alloy liquid, spread one deck charcoal insulating covering agent; Four, treat that magnesium and alterant melt the back fully and add the reductor phosphor-copper, furnace is risen to 1175 ± 5 ℃, be incubated 10 minutes; Five, skim to come out of the stove and pour into a mould: the metal type dies preheating temperature is 400-450 ℃, with preparation newly the Zinc oxide water glass solution be coated on the mould inner surface, thermal treatment process is 670 ± 5 ℃ of solid solutions 3 hours, behind the oil quenching 270 ℃ of timeliness 1 hour.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691884A (en) * | 2013-11-28 | 2014-04-02 | 福州文泰机械铸造有限公司 | Swage for casting high-pressure plunger pump solid rotor and casting method for swage |
| CN107164652A (en) * | 2017-04-28 | 2017-09-15 | 华南理工大学 | A kind of leadless free-cutting silicon magnesium phosphorus brass alloys and preparation method thereof |
| CN107739855A (en) * | 2017-09-27 | 2018-02-27 | 铜陵海源超微粉体有限公司 | A kind of method of smelting pure copper or high-copper alloy raw material |
-
2012
- 2012-07-03 CN CN2012102267677A patent/CN102703753A/en active Pending
Non-Patent Citations (2)
| Title |
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| 孙慧等: "热处理工艺对无铅黄铜腐蚀行为的影响", 《材料热处理技术》 * |
| 张建益等: "变质处理对高锌无铅黄铜组织与性能的影响", 《铸造技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691884A (en) * | 2013-11-28 | 2014-04-02 | 福州文泰机械铸造有限公司 | Swage for casting high-pressure plunger pump solid rotor and casting method for swage |
| CN107164652A (en) * | 2017-04-28 | 2017-09-15 | 华南理工大学 | A kind of leadless free-cutting silicon magnesium phosphorus brass alloys and preparation method thereof |
| CN107164652B (en) * | 2017-04-28 | 2020-09-22 | 华南理工大学 | Lead-free-cutting silicon-magnesium-phosphorus brass alloy and preparation method thereof |
| CN107739855A (en) * | 2017-09-27 | 2018-02-27 | 铜陵海源超微粉体有限公司 | A kind of method of smelting pure copper or high-copper alloy raw material |
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Inventor after: Liang Yanfeng Inventor after: Dong Chengquan Inventor after: Li Gaohong Inventor after: Wang Chunjing Inventor before: Dong Chengquan Inventor before: Liang Yanfeng Inventor before: Li Gaohong |
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Application publication date: 20121003 |