CN102329995A - Aluminum alloy material for heat exchanger cooling flat tube - Google Patents
Aluminum alloy material for heat exchanger cooling flat tube Download PDFInfo
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- CN102329995A CN102329995A CN 201110171150 CN201110171150A CN102329995A CN 102329995 A CN102329995 A CN 102329995A CN 201110171150 CN201110171150 CN 201110171150 CN 201110171150 A CN201110171150 A CN 201110171150A CN 102329995 A CN102329995 A CN 102329995A
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- aluminum alloy
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Abstract
The invention relates to an aluminum alloy material for a heat exchanger cooling flat tube, which is characterized by comprising the following ingredients with the following contents: 0.5 to 1.2 weight percent of Si, 0.05 to 0.35 weight percent of Ti, 0.25 to 1.8 weight percent of Zn, 0.15 to 0.35 weight percent of Mg and the balance Al and inevitable impurities. The aluminum alloy material disclosed by the invention has the advantages of higher strength characteristic, good solderability, excellent corrosion resistance and good processability and is particularly suitable for being used as the heat exchanger cooling flat tube.
Description
Technical field
The present invention relates to a kind of aluminum alloy materials, the present invention relates to a kind of aluminum alloy materials that is suitable for the interchanger cooling flat tube specifically, it has excellent erosion resistance, and its processability is good.
Background technology
In interchanger such as vaporizer, condensing surface, use the good duraluminum of light weight and thermal conductivity always.Usually, the manufacturing of these interchanger is to carry out according to following method: for example through with sheet bending, or in addition range upon range of by the sheet material of press working moulding, thereby form the cooling flat tube as working fluid.
With regard to erosion resistance, because from outside surface and inner corrosion, when producing break-through prematurely in the refrigerant path pipe; Leakage of refrigerant can't play the function as interchanger, therefore; Implement anti-corrosive treatment at the outside surface of refrigerant path pipe always, prolong the life-span of interchanger thus.In the past, to adopt Al-Zn be alloy was coated on the outside surface of sheet material as sacrificial anode material, and with this plate forming for equalling the method that tubulose uses partially; Or the method for extruding perforated tube as the refrigerant path pipe use.Yet the structure of most interchanger is the structures that engage fin at the outside surface of refrigerant path pipe, because there is not solder in the outside surface of refrigerant path pipe in the method, therefore, must use the fin material that has coated solder.At this moment, owing to receive the influence of the solder that residues in fin surface, self corrosion resistance nature of fin material reduces, and the manufacturing cost that coats the fin material in addition is higher than naked fin, therefore causes the rising of interchanger manufacturing cost.
In the fin that the outside surface of refrigerant path pipe engages, use under the situation of naked material, can improve self erosion resistance of fin, and through using the high conduction material; Can also improve the performance of interchanger; Compare with coating the fin material, also can reduce cost, but need give solder this moment at the outside surface of refrigerant path pipe; Therefore; Will be the pulverous solder of surface-coated of alloy at above-mentioned Al-Zn, perhaps, will use outside surface to be coated with at Al-Si be the sheet material that has added the material of Zn in the solder alloy.Under the former situation,, therefore cause the increase of interchanger manufacturing cost because the cost of powder brazing alloy is high; In the latter case, owing to flowing of the molten solder that contains Zn in the soldering, therefore; Do not reach as the needed Zn amount of sacrificial anode material in the residual Zn amount of refrigerant passage tube outer surface after causing soldering, cause to obtain enough anticorrosion abilities of refrigerant path pipe, perhaps; Flow to the junction surface owing to contain the molten solder of Zn, cause the preferential corrosion at junction surface.
In the prior art, application number is 02828286.8 patent report relates to a kind of brazed heat exchanger superpower, durable, that erosion resistance improves and uses aluminium fin.This alloy is based on the regenerated material.This alloy demonstrates the corrosive nature of raising, excellent anti-performance and the back soldering strength of hanging down of high temperature for pitting corrosion.Through optimizing the combination of materials of radiator element, pipe, end plate and side plate, can be manufactured on the interchanger that has enough corrosive natures among the SWAAT.
Application number is 02806584.0 patent report, and a kind of corrosion resistant aluminum alloy has iron, manganese, chromium and the titanium of manipulated variable, and the zinc that contains copper, silicon, nickel and be no more than impurity level.Adjust the chemical constitution of said alloy,, thereby reduce intergranular corrosion so that the electropotential of grain boundary and alloy substrate be complementary.Said alloy is particularly suitable for adopting extruding and soldering tech to make the tubing in the heat exchanger.
Summary of the invention
The aluminum alloy materials that the purpose of this invention is to provide a kind of interchanger cooling flat tube; Still can not satisfy the requirement of the abominable working conditions of interchanger cooling flat tube to aluminum alloy heat exchanger of the prior art at intensity, corrosion resistance nature, processability, a kind of higher strength characteristics, solderability, corrosion resistance excellent is provided and have the aluminum alloy materials of the cooling flat tube of good processability.
To achieve these goals, the present invention has adopted following technical scheme:
A kind of aluminum alloy materials of interchanger cooling flat tube; It is characterized in that it has following component and content: Si:0.5-1.2wt%, Ti:0.05-0.35 wt%; Zn:0.25-1.8 wt%, Mg:0.15-0.35 wt%, surplus is that Al and unavoidable impurities constitute.
The meaning and the qualification reason of the alloying constituent of aluminum alloy materials of the present invention are described below.
Si：
Through in the duraluminum of cooling flat tube, adding can the be improved effect of intensity of Si.Preferred content is Si:0.5-1.2 wt%, if when the content of silicon is lower than 0.5 wt%, the effect that improves intensity is just little.The content of Si surpasses the upper limit, and then the solidity to corrosion to duraluminum produces adverse influence, and if content surpass the upper limit, then the rolling processing performance reduces.Preferably, the content range of Si is: 0.6-1.0 wt%.
：
Through in the duraluminum of cooling flat tube, adding Ti, can the refinement aluminum alloy granule, thus the erosion that produces to the grain boundary infiltration because of molten solder can be inhibited soldering the time.Preferably, the content range of Ti is: 0.10-0.30 wt%.
Zn：
Through in the duraluminum of cooling flat tube, adding Zn; Can increase and make and the flowability of weld period, can improve the workability of material, yet if the existence of the intermetallic phase that the further increase of the content of Zn will cause not expecting; Lure intergranular corrosion easily; And work as content at 0.25-1.8 wt%, when improving the material workability, the corrosion resisting property of material there is not adverse influence.The preferred content of Zn is 0.30-1.5wt%, more preferably 0.50-1.30 wt%.
Mg：
Through in the duraluminum of cooling flat tube, adding Mg, the effect of the intensity that can be improved, the titanium in alloy can be worked in coordination with the corrosion resisting property of improving material.The preferred content of Mg is 0.10-0.35 wt%, if content surpasses 0.35 wt%, will significantly reduce brazing property.The further preferred content range of Mg is 0.10-0.25 wt%.
In addition; The invention also discloses the preparation method of the aluminum alloy materials of above-mentioned interchanger cooling flat tube; It is characterized in that, will under nitrogen protection atmosphere, be heated to 580-650 ℃ of insulation 20-60 min by the alloy raw material of Si, Ti, Zn, Mg and the Al of above-mentioned weight percent proportioning; Add the MnCl that accounts for alloy raw material gross weight 0.2-0.8 wt%
2, stir 8-15 min; Afterwards with alloy liquid casting; Then in 350-450 ℃ of insulation 2-10 h processings that homogenize, and cool off the aluminum alloy materials that obtains the interchanger cooling flat tube.
Aluminum alloy materials of the present invention behind homogenizing annealing, is observed its metallographic structure, and crystal grain is tiny and evenly beneficial to the solidity to corrosion that improves duraluminum; And do not find to exist in a large number the heterogeneous phase of galvanic corrosion in its tissue, alleviated the tendency that intergranular corrosion takes place greatly; Adopt the SWAAT experiment that the corrosion behavior of alloy material is tested, show that duraluminum solidity to corrosion of the present invention is significantly increased; And the intensity of material and common aluminium alloys also had significant raising, and the aluminum alloy materials that the present invention describes is suitable for being processed into cooling flat tube.
Embodiment
Following the present invention will combine concrete embodiment that the present invention is done further explanation and explanation.
Press the shown mass percent of table 1, prepare aluminum alloy materials of the present invention.Concrete preparation process is: will under nitrogen protection atmosphere, be heated to 620 ℃ of insulation 50 min by the alloy raw material ingot of Si, Ti, Zn, Mg and the Al of the shown per-cent proportioning of table 1; Add the MnCl that accounts for alloy raw material gross weight 0.5 wt%
2, stir 10 min; Afterwards at 550 ℃ with alloy liquid casting, then in the 350-450 ℃ of insulation 2-10 h processing that homogenizes.
The chemical ingredients of table 1 mother metal duraluminum
| Numbering | Si | Ti | Zn | Mg | Al |
| 1 | 0.5 | 0.05 | 0.25 | 0.15 | Surplus |
| 2 | 1.2 | 0.35 | 1.8 | 0.35 | Surplus |
| 3 | 0.6 | 0.10 | 0.35 | 0.18 | Surplus |
| 4 | 0.7 | 0.15 | 0.50 | 0.20 | Surplus |
| 5 | 0.8 | 0.20 | 0.75 | 0.25 | Surplus |
| 6 | 0.9 | 0.25 | 1.05 | 0.28 | Surplus |
| 7 | 1.0 | 0.30 | 1.25 | 0.30 | Surplus |
| 8 | 1.1 | 0.35 | 1.50 | 0.32 | Surplus |
The aluminum alloy materials that obtains is carried out following Performance Detection
Strength of materials test
In order to measure tensile strength, carry out the standard tensile test at normal temperatures, the tensile strength of test material.The above person of tensile strength 120MPa is evaluated as well (zero), will be lower than 120MPa person and be evaluated as bad (*).
The material corrosion resistance test
Size with 50 * 50 mm cuts out sample respectively, carries out salt-fog test.The corrosion test time set is 1200 hours, material surface do not have the degree of depth surpass 0.1 mm corrosion pit, be evaluated as good (zero), will have the sample of the corrosion pit that surpasses 0.1 mm to be evaluated as corrodibility poor (*).Test result is presented in the table 2.
Table 2: sample tensile strength and salt-fog test result
| Specimen coding | Tensile strength | SWAAT test 1200 hours |
| 1 | ○ | ○ |
| 2 | ○ | ○ |
| 3 | ○ | ○ |
| 4 | ○ | ○ |
| 5 | ○ | ○ |
| 6 | ○ | ○ |
| 7 | ○ | ○ |
| 8 | ○ | ○ |
Claims (8)
1. the aluminum alloy materials of an interchanger cooling flat tube; It is characterized in that it has following component and content: Si:0.5-1.2wt%, Ti:0.05-0.35 wt%; Zn:0.25-1.8 wt%, Mg:0.15-0.35 wt%, surplus is that Al and unavoidable impurities constitute.
2. the described aluminum alloy materials of claim 1 is characterized in that the content range of described Si is: 0.6-1.0 wt%.
3. the described aluminum alloy materials of claim 1 is characterized in that the content range of described Ti is: 0.10-0.25 wt%.
4. the described aluminum alloy materials of claim 1, the content that it is characterized in that described Zn is 0.30-1.5wt%.
5. the described aluminum alloy materials of claim 3, the content that it is characterized in that described Zn is 0.50-1.30 wt%.
6. the described aluminum alloy materials of claim 1, the content that it is characterized in that described Mg is 0.10-0.25 wt%.
7. the preparation method of each described aluminum alloy materials of claim 1-6 is characterized in that the alloy raw material by Si, Ti, Zn, Mg and the Al of aluminum alloy materials proportioning is heated to 580-650 ℃ of insulation 20-60 min under nitrogen protection atmosphere; Add the MnCl that accounts for alloy raw material gross weight 0.2-0.8 wt%
2, stir 8-15 min; Afterwards with alloy liquid casting; In 350-450 ℃ of insulation 2-10 h processings that homogenize, cool off the aluminum alloy materials that obtains the interchanger cooling flat tube then.
8. the described preparation method of claim 7 is characterized in that described teeming temperature is 500-580 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110171150 CN102329995A (en) | 2011-06-23 | 2011-06-23 | Aluminum alloy material for heat exchanger cooling flat tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110171150 CN102329995A (en) | 2011-06-23 | 2011-06-23 | Aluminum alloy material for heat exchanger cooling flat tube |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2056491A (en) * | 1979-08-16 | 1981-03-18 | Howmet Turbine Components | Superalloy coating composition with oxidation and/or sulphidation resistance |
| US5529642A (en) * | 1993-09-20 | 1996-06-25 | Mitsubishi Materials Corporation | Nickel-based alloy with chromium, molybdenum and tantalum |
| CN1918310A (en) * | 2004-01-12 | 2007-02-21 | 美铝公司 | High-conductivity finstock alloy, method of manufacture and resultant product |
| CN101880805A (en) * | 2010-07-30 | 2010-11-10 | 浙江巨科铝业有限公司 | Al-Mg-Si aluminum alloy for automobile body panel and method for producing same |
-
2011
- 2011-06-23 CN CN 201110171150 patent/CN102329995A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2056491A (en) * | 1979-08-16 | 1981-03-18 | Howmet Turbine Components | Superalloy coating composition with oxidation and/or sulphidation resistance |
| US5529642A (en) * | 1993-09-20 | 1996-06-25 | Mitsubishi Materials Corporation | Nickel-based alloy with chromium, molybdenum and tantalum |
| CN1918310A (en) * | 2004-01-12 | 2007-02-21 | 美铝公司 | High-conductivity finstock alloy, method of manufacture and resultant product |
| CN101880805A (en) * | 2010-07-30 | 2010-11-10 | 浙江巨科铝业有限公司 | Al-Mg-Si aluminum alloy for automobile body panel and method for producing same |
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Application publication date: 20120125 |