CN100507044C - Pressure cast aluminium alloy and its application - Google Patents
Pressure cast aluminium alloy and its application Download PDFInfo
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- CN100507044C CN100507044C CNB2006100265559A CN200610026555A CN100507044C CN 100507044 C CN100507044 C CN 100507044C CN B2006100265559 A CNB2006100265559 A CN B2006100265559A CN 200610026555 A CN200610026555 A CN 200610026555A CN 100507044 C CN100507044 C CN 100507044C
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Abstract
The present invention provides one kind of pressure cast aluminum alloy and its application, and belongs to the field of material science. The pressure cast aluminum alloy consists of Si 4-8 wt%, Mg 1-5 wt%, and Al for the rest. The pressure cast aluminum alloy is applied to produce hard anodized oxide film through the following steps: smelting, pressure casting, modifying mechanically, and forming hard anodized oxide film. The pressure cast aluminum alloy has anodized oxide film with great thickness, high hardness and high corrosion resistance.
Description
Technical field
The present invention relates to a kind of aluminium alloy, relate in particular to a kind of aluminium diecast alloy, the invention still further relates to this aluminium alloy simultaneously in the particularly application in the hard anodized film of preparation surface conversion coating; Belong to material science.
Background technology
Aluminium is a kind of metal that is only second to iron and steel output, and this is because it has a series of premium propertiess.Its density is little, is 1/3 of steel only, and weight is lighter; Good processibility is arranged, be easy to strike out the shape of various complexity; Erosion resistance is strong, good electroconductibility and thermal conductivity, and softer but aluminium has material, intensity is lower, and is easily deformable when being collided; Welding property is poor, and seam can not be welded; Erosion resistance to bronsted lowry acids and bases bronsted lowry is relatively poor, the more high shortcoming of cost; Form aluminium diecast alloy so usually on basis, add other elements at fine aluminium, existing aluminium diecast alloy can be divided into four classes such as aluminum silicon alloy, aluminum-copper alloy, aluminum magnesium alloy and aluminium-zinc alloy according to its classification, as Chinese patent application (02145062.5) Aluminium Copper Silico-aluminous Manganese Pack Alloy, these aluminium diecast alloys of Chinese patent application (200410040009.1) high-performance aluminium diecast alloy can not only keep the fundamental property of aluminium, and because alloying and heat treated effect make aluminium alloy have good comprehensive performances.It is on the low side that but these aluminium diecast alloys have hardness, and erosion resistance, wear resistance are not ideal enough.All to carry out surface treatment on general aluminium surface and form erosion resistance, the wear resistance that oxide film increases aluminium.Obtain oxide film and be not easy and handle on the surface of aluminium diecast alloy, obtain oxide film though can carry out surface treatment as the aluminium diecast alloy that relates in ZL101, the ZL108 of China and the above-mentioned patent application, the thickness of the oxide film that obtains, hardness, wear resistance and erosion resistance are not very desirable.Though the ADC6 of YL302, Japan can obtain comparatively fine hard anodized film, can only be used for die casting and make the simple workpiece of some moulding, and often cost is too high.
Summary of the invention
The present invention is directed to the problems referred to above that aluminium diecast alloy of the prior art exists, a kind of new aluminium diecast alloy and application thereof are provided.
Technique scheme of the present invention is implemented by following technical problem: a kind of aluminium diecast alloy is characterized in that this material is grouped into by the one-tenth of following weight per-cent basically:
Si:4～8%, Mg:1～5%, all the other are Al.
In the aluminium alloy that prior art die casting is made, often has higher silicon content (Si8), though in metallographic structure, be distributed in the tissue with the disperse of Si phase form.When but the alloy that this type of material is made carried out hard anodizing, Si phase current potential was far just in Al, thereby voltage improves greatly when making hard anodizing produce oxide film, and oxidation film layer is discontinuous, and performance does not reach requirement.And low silicon content (Si≤8%) in the material, mobile and hardness reduction, die casting performance is variation gradually; The die casting performance of aluminium diecast alloy that other aluminium alloy is made such as Al-Cu system, Al-Zn system and the effect that hard anodizing prepares oxide film are difficult in conjunction with reaching best.Though and the Al-Mg series die-casting alloy aluminum can obtain oxide film by the hard anodizing technology, it is very poor that performance is made in its die casting.
The inventor is by studying for a long period of time: adopt a kind of novel Al-Si-Mg series die-casting alloy aluminum, its ternary phase diagrams as shown in Figure 1.The metallographic structure of adopting the aluminium diecast alloy that the aluminium diecast alloy of this component makes is with Al, Si and Mg
2The form of Si exists.Mg wherein
2Si has very high hardness mutually, can improve the intensity of alloy greatly, and wherein the alloy content of MgSi cooperates, and exactly can access good die casting and make performance.On the other hand, adopt Si in the component of this aluminium diecast alloy of the present invention about 2.5～5.5%, Si content is reduced (with Al-Si being relatively) greatly, and its influence to hard anodizing reduces greatly; And a large amount of Mg
2Si 25～5.5%) key that the aluminium diecast alloy hard anodizing technology that makes of the present invention of being mutually is achieved, use Mg
2Si replaces Si mutually in a large number can carry out the die casting manufacturing mutually easily; And Mg
2Si phase current potential slightly is defeated by Al, and can have small portion to enter in the oxide film, can reduce the influence of the relative oxidizing potential of Si; So the aluminium diecast alloy that utilizes aluminium diecast alloy of the present invention to make can generate hard anodized film preferably.
In above-mentioned a kind of aluminium diecast alloy, the optimizing components weight percent of material of the present invention is:
Si:4.5～6.5%, Mg:1.5～3.5%, all the other are Al.
The present invention also provides the above-mentioned application of aluminium diecast alloy in the preparation surface conversion coating in addition.
As preferably, described surface conversion coating is a hard anodized film.
In above-mentioned application process, the application process of described aluminium diecast alloy in the preparation hard anodized film realizes according to the following steps:
(1) fusing: the component that contains aluminium diecast alloy of the present invention at melt in furnace;
(2) die casting: will melt good composition and pour into and carry out the die casting manufacturing in the die casting equipment;
(3) machinery is modified: unnecessary part after the removal die casting, the burr on surface, mechanical workout and certain surface finishing;
(4) hard anodizing: the aluminium diecast alloy after the modification of above-mentioned process machinery is carried out hard anodizing promptly get hard anodized film, wherein processing condition are as follows:
Sulfuric acid (H
2SO
4): 150～250gL
Temperature :-5～5 ℃
Current density: 2.0～4.0A dm
2
Voltage: 0～100V
Time: 30～40min.
Therefore the present invention has the following advantages:
Utilize the aluminium alloy of aluminium diecast alloy preparation of the present invention to obtain having high thickness (average 35 μ m), high rigidity (vickers microhardness 〉=300kg mm by the hard anodizing technology
2), the oxide film of high corrosion resistance (oxide film that sealed can by the neutral salt spray test of 336h).
Description of drawings
Fig. 1 is the ternary phase diagrams of aluminium diecast alloy of the present invention.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail; But the present invention is not limited to these embodiment.
Embodiment: by the alloyage of composition shown in the table 1 wherein the procedure component analysis carry out all-the-way tracking control with ultraviolet spectrum analyzer (German OBLF company produce), the component of this kind aluminium diecast alloy is melted with 680～710 ℃ in the GR3-60 industrial furnace, the alloying constituent that fusing is good is poured into and is carried out die casting in the DC700 pressure die-casting machine and made the thick finished product of aluminium diecast alloy in 1 minute, obtains aluminium diecast alloy by mechanical workout and after adopting surface finishing after the thick finished product of aluminium diecast alloy of above-mentioned preparation being removed the burr on part unnecessary after the die casting and surface.
Table 1: aluminium diecast alloy component of the present invention (weight percent)
Application Example 1
The aluminium diecast alloy of the foregoing description preparation is connected with the positive pole of power supply on the oxidation hanger, the negative pole aluminium sheet, putting into concentration of electrolyte is that 150～250gL, temperature are controlled at-5～5 ℃ sulfuric acid H
2SO
4In the solution, the temperature of solution is that the refrigeration system of GKS3-200A unit cooler (Xinshijie Refrigeration Industry Co., Ltd., Wuhan's production) is controlled by main frame;
At volts DS is 0～100V, and current density is 2.0～4.0A dm
2Electrolyzer in; Wherein electric current, voltage are controlled by silicon-controlled rectifier (Guangzhou Inst. of Electric Equipment Science's production), the aluminium diecast alloy for preparing in the embodiment of the invention is placed in the electrolytic solution, electrochemical reaction promptly takes place after the energising, outside surface at aluminium diecast alloy forms oxide film, promptly carry out hard anodizing, its oxidization time is 30～40min;
Carrying out honing in order to reduce friction ratio and non-viscosity through hard anodizing outside surface spraying Teflon (trade name of the polyfluorine carbon resin of Dupont) and to the interior hole dimension of precision.
After testing: the thickness of the aluminium diecast alloy hard anodized film that the present invention obtains is 35 μ m, and vickers microhardness is 350kgmm
2
Application Example 2
The aluminium diecast alloy of the foregoing description preparation is connected with the positive pole of power supply on the oxidation hanger, the negative pole aluminium sheet, putting into concentration of electrolyte is that 150～250gL, temperature are controlled at-5～5 ℃ sulfuric acid H
2SO
4In the solution, the temperature of solution adopts the pressurized air violent stirring to control;
At volts DS is 0～100V, and current density is 2.0～4.0A dm
2Electrolyzer in, the aluminium diecast alloy for preparing in the embodiment of the invention is placed in the electrolytic solution, and electrochemical reaction promptly takes place after the energising, forms oxide film at the outside surface of aluminium diecast alloy, promptly carries out hard anodizing, its oxidization time is 30～40min;
Sealing: under 26～30 ℃ of conditions of temperature, carry out sealing of hole with normal-temperature sealer YL-104 (production of Guangzhou Chang Dong chemical materials company limited), control Ni
2+: 2.0～2.2gL, F
-: 1.1～1.3gL,, off-period 15～20min
Carrying out honing in order to reduce friction ratio and non-viscosity through hard anodizing outside surface spraying Teflon (trade name of the polyfluorine carbon resin of Dupont) and to the interior hole dimension of precision.
After testing: the thickness of the aluminium diecast alloy hard anodized film that the present invention obtains is 35 μ m, and vickers microhardness is 350kg mm
2, the aluminium diecast alloy hard anodized film that obtains of the present invention can be by the neutral salt spray test of 336h in addition, thereby confirm that it has high corrosion resistance.
The comparative example
With the aluminium ingot difference alloyage of ZL102, ZL108 cast aluminium alloy, the same embodiment of technological process of other preparation aluminium diecast alloy
Contrast Application Example 1
Adopt the comparative example to prepare aluminium diecast alloy by hard anodizing prepared oxide film, its technological process is with Application Example 2;
After testing: the thickness of the aluminium diecast alloy hard anodized film that this contrast Application Example 1 obtains is 15～18 μ m, and vickers microhardness is 150～200kg mm
2The aluminium diecast alloy hard anodized film that obtains of this contrast Application Example can't be by the neutral salt spray test of 336h in addition, thereby confirms that its erosion resistance is relatively poor.
In sum: utilize the aluminium alloy of aluminium diecast alloy preparation of the present invention can obtain having high thickness by the hard anodizing technology, high rigidity, the oxide film of high corrosion resistance.
Specific embodiment described in the present invention only is that the present invention's spirit is illustrated.The technician of the technical field of the invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Although the present invention has been made detailed explanation and has quoted some specific exampless as proof, to those skilled in the art, only otherwise leave that the spirit and scope of the present invention can be done various variations or correction is obvious.
Claims (1)
1, a kind of aluminium diecast alloy with hard anodized film is characterized in that, this material is grouped into by the one-tenth of following weight per-cent basically:
Si:4.5～5.5%, Mg:2.5～3.5%, all the other are Al; The metallographic structure of described aluminium diecast alloy is with Al, Si and Mg
2The form of Si exists; The surface conversion coating of described aluminium diecast alloy is a hard anodized film; Described preparation with aluminium diecast alloy of hard anodized film realizes according to the following steps:
(1) fusing: the component that aluminium diecast alloy is contained is at melt in furnace;
(2) die casting: will melt good composition and pour into and carry out the die casting manufacturing in the die casting equipment;
(3) machinery is modified: remove the part unnecessary after the die casting and the burr on surface, mechanical workout and certain surface finishing;
(4) hard anodizing: the aluminium diecast alloy after the modification of above-mentioned process machinery is carried out hard anodizing promptly get hard anodized film, wherein processing condition are as follows:
Sulfuric acid (H
2SO
4): 150～250g/L
Temperature :-5～5 ℃
Current density: 2.0～4.0A/dm
2
Voltage: 0～100V
Time: 30～40min.
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| CNB2006100265559A CN100507044C (en) | 2006-05-15 | 2006-05-15 | Pressure cast aluminium alloy and its application |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5271215B2 (en) * | 2009-09-15 | 2013-08-21 | 株式会社日立製作所 | Method for reforming aluminum die-cast products |
| CN103173830A (en) * | 2011-12-24 | 2013-06-26 | 汤锦练 | Surface treatment method of aluminum product |
| CN102828217B (en) * | 2012-09-08 | 2015-12-16 | 浙江苏泊尔股份有限公司 | A kind of aluminum alloy surface hard anode oxidation colorize method |
| CN103343374B (en) * | 2013-07-09 | 2016-05-18 | 浙江苏泊尔股份有限公司 | A kind of hard anodize method of cast aluminium alloy workpiece |
| CN103668385A (en) * | 2013-12-10 | 2014-03-26 | 常熟柏科汽车零件再制造有限公司 | Hard anodic oxidation treatment method for cast aluminum alloy workpiece |
| GB201402323D0 (en) * | 2014-02-11 | 2014-03-26 | Univ Brunel | A high strength cast aluminium alloy for high pressure die casting |
| KR101606525B1 (en) * | 2014-10-29 | 2016-03-25 | 주식회사 케이엠더블유 | Aluminum alloy for die casting having excellent corrosion resistance |
| CN105887151A (en) * | 2016-05-23 | 2016-08-24 | 沈阳富创精密设备有限公司 | Corrosion resistance sulfuric acid hard anodizing process |
| CN108103548B (en) * | 2018-03-02 | 2023-09-19 | 安徽尚德科技有限公司 | High wear-resisting aluminum alloy intermediate plate |
| CN109750191B (en) * | 2019-01-31 | 2021-02-12 | 华为技术有限公司 | High-strength high-toughness high-heat-conductivity aluminum alloy for die casting |
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2006
- 2006-05-15 CN CNB2006100265559A patent/CN100507044C/en active Active
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