KR101743234B1 - Aluminum alloy for die casting - Google Patents
Aluminum alloy for die casting Download PDFInfo
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- KR101743234B1 KR101743234B1 KR1020160017684A KR20160017684A KR101743234B1 KR 101743234 B1 KR101743234 B1 KR 101743234B1 KR 1020160017684 A KR1020160017684 A KR 1020160017684A KR 20160017684 A KR20160017684 A KR 20160017684A KR 101743234 B1 KR101743234 B1 KR 101743234B1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/003—Alloys based on aluminium containing at least 2.6% of one or more of the elements: tin, lead, antimony, bismuth, cadmium, and titanium
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- 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
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
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Abstract
The present invention relates to an aluminum alloy for die casting having a composition capable of performing an anodizing treatment on a die casting product, which comprises 0.03 to 0.8 wt% of Cu, 0.7 to 4.5 wt% of Zn, 0.1 to 3.5 wt% of Ni, % Of Mn, 1.5 to 5.5 wt% of Mn, 0.02 to 3.0 wt% of Ti, 0.3 to 4.5 wt% of Zr, 0.4 to 1.3 wt% of Mg, 0.3 to 1.7 wt% of Cd, 0.5 to 3.0 wt% of Br, 0.03 to 3.5 wt% 0.03 to 3.5 wt% of Pb, 0.1 to 4.0 wt% of B, 0.3 to 3.5 wt% of Co, 0.05 to 3.0 wt% of Ir, 0.07 to 3.0 wt% of Cr, 0.03 to 0.9 wt% of Pd, 0.1 to 3.0 wt% of Si, ; And the remainder is made of Al.
Description
The present invention relates to an aluminum alloy for die casting, and more particularly, to an aluminum alloy for die casting having a composition capable of anodizing an aluminum die casting product.
Aluminum alloy is light and strong in strength, so it is widely used as a durable material. Particularly, recently, it is widely used as a case of electronic parts such as automobile parts and mobile phones. Particularly, in the aluminum alloy materials of the electronic devices (especially mobile phone cases) manufactured by die casting, The work of increasing the commerciality through the anodizing (electro-oxidative coating) process has recently emerged as a big issue.
The aluminum anodizing process is an electrochemical process used for corrosion resistance, abrasion resistance, electrical insulation and aesthetic characteristics. The oxide layer produced by this process has a very strong strength and pore structure which can be colored. Anodizing has the following advantages compared to painting or physical vapor deposition (PVD). Painting is not sustainable,
It does not comply with Restriction of Hazardous Substances (RoHS), which regulates the heavy metals and toxic substances specified by the European Union. In addition, PVD has a very low degree of freedom in color selection and very low process stability required in mass production.
Therefore, anodic oxidation, that is, anodizing, which forms an oxide film having high adhesion with a base metal by oxygen generated from the anode is widely utilized. The oxidation film formed by anodizing is excellent in corrosion resistance and abrasion resistance, and has excellent durability with excellent adhesion with base metal. In addition, due to the advantage that a decorative ornamental appearance can be obtained by coloring a low-cost coloring process in which a porous layer of an oxide film is filled with a dye and sealing is performed, the use thereof is particularly increased in relation to aluminum and its alloys . However, anodizing has the following limitations.
When a product molded by die casting is subjected to an anodizing process, a coagulation deviation occurs due to the high-speed flow, and a local segregation zone may occur due to a change in the composition of the alloy during the solidification process. Is expressed as a flow mark on the product surface depending on the type of solute, and such a flow mark is not erased even by polishing. Therefore, when anodizing is performed on a product formed by solute segregation, there is a problem that an advantage of anodizing, that is, good decorative ornamental appearance disappears, because a flow mark remains in the oxide film formed thereby.
Particularly, when the anodizing process is carried out after casting with a conventional aluminum alloy, characteristics such as fracture strength are lowered and it is difficult to mass-produce an actual product.
That is, a conventional aluminum alloy material applied to an exterior of an electronic device for die casting casting (particularly, a mobile phone case) is made of an incompatible composition for the treatment of anodizing, so that satisfactory satisfactory characteristics and coloring and surface texture of the product can not be obtained, There is a limit to improvement.
<Prior Art Literature>
(Patent Document 1) KR10-1055373 B1
(Patent Document 2) KR10-2012-0130114 A
(Patent Document 3) KR10-2012-0128769 A
(Patent Document 4) KR10-2013-0010035 A
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and has the following objectives.
It is an object of the present invention to provide an aluminum alloy for die casting, which has a composition that allows a colored product to be anodized by a die casting.
Another object of the present invention is to provide an aluminum alloy for die casting having a composition capable of being molded by die casting, that is, capable of casting a product having characteristics such as fracture strength similar to existing die casting materials.
Another object of the present invention is to provide an aluminum alloy for die casting which is capable of color anodizing which can obtain durability suitable for exterior materials of electric and electronic devices such as mobile communication terminals of complex shapes.
In order to achieve the above object, the present invention is implemented by the following means.
The present invention provides an aluminum alloy for die casting capable of forming a film by anodizing treatment, which comprises 0.03 to 0.8 wt% of Cu, 0.7 to 4.5 wt% of Zn, 0.1 to 3.5 wt% of Ni, 0.3 to 5.5 wt% of Fe, 0.5 to 3.0% by weight of Cd, 0.03 to 3.5% by weight of Sn, 0.03 to 3.5% by weight of Pb, 0.03 to 3.5% by weight of Pb, 0.05 to 3.0% by weight of Ti, 0.3 to 4.5% 0.1 to 4.0 wt% of B, 0.3 to 3.5 wt% of Co, 0.05 to 3.0 wt% of Ir, 0.07 to 3.0 wt% of Cr, 0.03 to 0.9 wt% of Pd, and 0.1 to 3.0 wt% of Si; And the remainder is made of Al.
Preferably, the Cu is 0.14 wt%, the Zn is 1.8 wt%, the Ni is 0.15 wt%, the Fe is 0.3 wt%, the Mn is 2.3 wt%, the Ti is 0.02 wt% Zr is 0.4 wt%, Mg is 0.4 wt%, Cd is 0.3 wt%, Br is 2.3 wt%, Sn is 0.04 wt%, Pb is 0.08 wt%, B is 0.1 wt%, Co Is 0.3% by weight, Ir is 0.05% by weight, Cr is 0.07% by weight, Pd is 0.04% by weight, and Si is 0.1% by weight.
The present invention has the following effects with the above-described configuration.
Another object of the present invention is to provide a die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting die casting There is an effect of providing an aluminum alloy for use.
FIG. 1 is a photograph of a product molded, anodized and colored with an aluminum alloy for die casting according to the present invention.
FIGS. 2 and 3 are photographs of the conventional ADC 12 and the aluminum alloy of the present invention magnified 400 times, respectively.
Hereinafter, the solution means of the present invention will be described in detail. The detailed description of known technology, which is considered to be unnecessarily obscured by the gist of the present invention, will be omitted.
The present invention provides an aluminum alloy for die casting capable of forming a film by anodizing treatment, which comprises 0.03 to 0.8 wt% of Cu, 0.7 to 4.5 wt% of Zn, 0.1 to 3.5 wt% of Ni, 0.3 to 5.5 wt% of Fe, 0.5 to 3.0% by weight of Cd, 0.03 to 3.5% by weight of Sn, 0.03 to 3.5% by weight of Pb, 0.03 to 3.5% by weight of Pb, 0.05 to 3.0% by weight of Ti, 0.3 to 4.5% 0.1 to 4.0 wt% of B, 0.3 to 3.5 wt% of Co, 0.05 to 3.0 wt% of Ir, 0.07 to 3.0 wt% of Cr, 0.03 to 0.9 wt% of Pd, and 0.1 to 3.0 wt% of Si; And the remainder is made of Al.
Preferably, the Cu content is 0.14 wt%, the Zn content is 1.8 wt%, the Ni content is 0.15 wt%, the Fe content is 0.3 wt%, the Mn content is 2.3 wt%, the Ti content is 0.02 wt%, the Zr content is 0.4 Wherein the Mg is 0.4 wt%, the Cd is 0.3 wt%, the Br is 2.3 wt%, the Sn is 0.04 wt%, the Pb is 0.08 wt%, the B is 0.1 wt%, the Co is 0.3 wt %, Ir of 0.05 wt%, Cr of 0.07 wt%, Pd of 0.04 wt%, and Si of 0.1 wt%.
First, the technical meaning of limiting the content of each alloy element added to the aluminum alloy of the present invention will be described.
The aluminum alloy for die casting of the present invention contains 0.03 to 0.8 wt% of Cu. Copper (Cu) is an element to be added to secure strength by the curing effect of Al-Cu-based solid solution and precipitation. The Cu component is dissolved in the alloy in the alloy to strengthen the matrix and prevent the die from sticking, And has a role of increasing strength by excellent precipitation hardening effect. If the copper content exceeds 0.8% by weight, the corrosion resistance decreases and segregation by the intermetallic compound occurs in the process. Preferably, it is added in an amount of 0.14% by weight based on the total weight of the entire alloy.
In addition, the aluminum alloy for die casting of the present invention contains 0.7 to 4.5 wt% of Zn. The Zn component plays a role in improving the mechanical properties, and it is possible to achieve an improvement in strength by solid solution strengthening with addition of at least 0.7 wt%. However, if zinc is added in an amount exceeding 4.5% by weight, segregation will occur and a uniform appearance can not be obtained. Preferably, it is added in an amount of 1.8 wt% based on the total weight of the total alloy.
Further, the aluminum alloy for die casting of the present invention contains 0.1 to 3.5% by weight of Ni. The Ni component serves to increase the toughness by refining the structure, and is preferably added in an amount of 0.15% by weight based on the total weight of the entire alloy.
In addition, the aluminum alloy for die casting of the present invention contains Fe in the range of 0.3 to 5.5 wt%. The Fe component reduces stickiness in the mold and reduces the erosion of the mold in the aluminum alloy for die casting, and is preferably added in an amount of 0.3% by weight based on the total weight of the entire alloy. If the Fe component is less than 0.3 wt% based on the total weight of the total alloy, there is a problem that the aluminum alloy is dislocated to the mold. On the other hand, when the Fe content exceeds 5.5 wt%, the corrosion resistance and the anodizing property of the aluminum alloy deteriorate.
The aluminum alloy for die casting of the present invention contains 1.5 to 5.5% by weight of Mn. The Mn component serves to improve the mechanical properties of the alloy through precipitation of Mn-Al 6 phase from the alloy to disperse the fine precipitates in the solid solution strengthening process, and is preferably added in an amount of 2.3% by weight based on the total weight of the entire alloy . If the Mn content is less than 1.5% by weight based on the total weight of the entire alloy, improvement of the mechanical properties is insignificant, whereas if the Mn content exceeds 5.5% by weight, surface anomalies occur after anodizing.
Titanium (Ti) is an element which is added to the aluminum alloy according to the present invention to refine the crystal grains to prevent hot cracking. In the aluminum alloy according to the present invention, 0.02 to 3.0 wt% is included. Even if it is added in an amount exceeding 3.0% by weight, an effect of further crystal grain refinement does not occur, so that a maximum of 3.0% by weight is added. On the other hand, if it is added in an amount less than 0.02% by weight, it is difficult to obtain grain refining effect, and preferably 0.02% by weight.
Further, the aluminum alloy for die casting of the present invention contains 0.3 to 4.5% by weight of Zr. The Zr component may be anodically oxidized in the alloy and may improve grain refinement and mechanical properties, and is preferably added in an amount of 0.4% by weight based on the total weight of the entire alloy.
In addition, the aluminum alloy for die casting of the present invention may further contain Mg in the range of 0.4 to 1.3 wt%. The Mg component facilitates corrosion resistance and anodic oxide film formation. Adding up to about 1.3% increases the strength. On the other hand, when the amount of the Mg component increases, a phenomenon such as surface unevenness occurs after the anodizing. Therefore, it is preferable that 0.4 wt% is added based on the total weight of the total alloy.
In the aluminum alloy for die casting of the present invention, silicon (Si) generates Mg 2 Si in the crystal phase together with magnesium (Mg) in the superfine solid state, thereby increasing the strength. In the aluminum alloy according to the present invention, 0.1 to 3.0 wt% of silicon is added, and at least 0.1 wt% is added to prevent hot cracking and ensure minimum fluidity. However, when the silicon content exceeds 3.0% by weight, segregation and precipitates are generated in the process, and stable Si does not react electrochemically, so that it has a color different from that of the surrounding base material, so that partial oxidation reaction occurs during anodizing, (Gloss) can not be obtained. Therefore, it is added in the above-mentioned range, preferably 0.1 wt% is added.
In the aluminum alloy for die casting of the present invention, 0.3 to 1.7 wt% of Cd, 0.5 to 3.0 wt% of Br, 0.03 to 3.5 wt% of Sn, 0.03 to 3.5 wt% of Pb, 0.1 to 4.0 wt% of B, 0.3 to 3.5 wt% of Co, 0.05 to 3.0% by weight of Ir, 0.07 to 3.0% by weight of Cr, 0.03 to 0.9% by weight of Pd, The above components together with the Si component serve to strengthen the connection between the tissue and the tissue in the alloy and have properties such as yield strength similar to that of a conventional die casting material as shown in the following examples . Preferably, the Cd is 0.3 wt%, the Br is 2.3 wt%, the Sn is 0.04 wt%, the Pb is 0.08 wt%, the B is 0.1 wt%, the Co is 0.3 wt%, the Ir is 0.05 wt %, 0.07% by weight of Cr, and 0.04% by weight of Pd.
The description of aluminum will be readily apparent to those skilled in the art and will not be described further herein. The aluminum alloy for die casting of the present invention can be produced according to a general alloy manufacturing method. That is, the aluminum alloy ingot may be prepared by dissolving pure aluminum, injecting the mother alloy into the pure aluminum molten metal to dissolve the molten alloy, stirring the molten metal and subjecting the molten alloy to degassing, and then obtaining an aluminum alloy ingot.
Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention.
(Production of aluminum alloy for die casting)
In order to produce the aluminum alloy for die casting according to the present invention, it is preferable that 0.14 wt% of Cu, 1.8 wt% of Zn, 0.15 wt% of Ni, 0.3 wt% of Fe, 2.3 wt% of Mn, 0.02 wt% of Ti, 0.4 wt% of Zr, 0.3 weight% of Cd, 2.3 weight% of Br, 0.04 weight% of Sn, 0.08 weight% of Pb, 0.1 weight% of B, 0.3 weight% of Co, 0.05 weight% of Ir, 0.07 weight% of Cr, 0.04 weight% of Pd, Preliminary pure aluminum and parent alloy were prepared in advance so that the weight percentage and the remainder were aluminum, and the alloy was melted, stirred and degassed at a temperature of about 800 캜 in a molten bath, and stabilized to obtain an aluminum alloy ingot.
(Product manufacturing)
The aluminum alloy ingot for die casting prepared in Example 1 was melted by melting for die casting, and then subjected to die casting, followed by foaming, trimming, barrel and anodizing (etching-neutralization-chemical polishing-neutralization-anodizing film-neutralization-coloring- ) Were carried out to prepare color anodizing products.
A table comparing the properties of the anodic oxidation product of ADC12 which is an aluminum alloy for die casting and the aluminum alloy for die casting according to the present invention is shown below.
In the above results Looking at the breaking strength, the breaking strength of conventional die casting aluminum alloy, ADC12 anodizing products 270N / mm 2, the fracture strength of the with the aluminum alloy according to the present invention, molding, anodizing product is 246N / mm 2 . It was found that the products of A, B, and C currently available on the market have breakdown strengths of 176, 118 and 127 N / mm 2 , respectively, , The anodized product provides an aluminum alloy capable of casting a product having a fracture strength of 240 to 250 N / mm 2 similar to that of the conventional die casting (ADC12).
FIG. 1 is a photograph of a product molded, anodized and colored with an aluminum alloy for die casting according to the present invention. As can be seen from FIG. 1, the products molded, anodized, and colored with the aluminum alloy for die casting according to the present invention exhibit uniform and beautiful colors without causing surface unevenness due to smutting of silicon during anodization It is possible to confirm that it is possible.
FIGS. 2 and 3 are photographs of the conventional ADC 12 and the aluminum alloy of the present invention magnified 400 times, respectively. The aluminum alloy structure of the present invention is uniformly distributed without Si segregation and dendrites are densely formed.
The embodiments of the present invention described above should not be construed as limiting the technical specification of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.
Claims (3)
Wherein the Cu is 0.14 wt%, the Zn is 1.8 wt%, the Ni is 0.15 wt%, the Fe is 0.3 wt%, the Mn is 2.3 wt%, the Ti is 0.02 wt%, the Zr is 0.4 wt% Mg is 0.4 wt%, Cd is 0.3 wt%, Br is 2.3 wt%, Sn is 0.04 wt%, Pb is 0.08 wt%, B is 0.1 wt%, Co is 0.3 wt%, Ir 0.05 wt%, Cr 0.07 wt%, Pd 0.04 wt%, and Si 0.1 wt%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190012767A (en) * | 2017-07-28 | 2019-02-11 | 대경제이엠 주식회사 | Aluminum alloy for gear pump housing |
| CN110106404A (en) * | 2019-06-11 | 2019-08-09 | 天津圣金特汽车配件有限公司 | A kind of high-strength wearproof corrosion-resistant aluminium alloy and preparation method thereof |
| CN110938763A (en) * | 2019-12-13 | 2020-03-31 | 广州致远新材料科技有限公司 | Preparation method of die-casting aluminum alloy material capable of being anodized and die-casting method |
| KR20200084684A (en) * | 2019-01-03 | 2020-07-13 | 유순경 | Aluminum alloy for die casting of door lock and manufacturing method thereof |
| KR102264501B1 (en) | 2020-11-10 | 2021-06-23 | 최시은 | Aluminium alloy for die-casting capable of forming high quality oxide film by anodizing treatment |
| US20210276099A1 (en) * | 2018-07-09 | 2021-09-09 | C-Tec Constellium Technology Center | Process for manufacturing aluminium alloy parts |
| KR20220063541A (en) | 2020-11-10 | 2022-05-17 | 최시은 | Method for manufacturing aluminum alloy die-cast products with excellent appearance quality by anodizing treatment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101055373B1 (en) | 2011-01-27 | 2011-08-08 | 지케이 주식회사 | Aluminum alloy for diecasting |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101055373B1 (en) | 2011-01-27 | 2011-08-08 | 지케이 주식회사 | Aluminum alloy for diecasting |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190012767A (en) * | 2017-07-28 | 2019-02-11 | 대경제이엠 주식회사 | Aluminum alloy for gear pump housing |
| KR101973940B1 (en) * | 2017-07-28 | 2019-04-30 | 대경제이엠 주식회사 | Manufacturing Method of Gear Pump Housing Using Aluminium Alloy |
| US20210276099A1 (en) * | 2018-07-09 | 2021-09-09 | C-Tec Constellium Technology Center | Process for manufacturing aluminium alloy parts |
| KR20200084684A (en) * | 2019-01-03 | 2020-07-13 | 유순경 | Aluminum alloy for die casting of door lock and manufacturing method thereof |
| KR102191138B1 (en) * | 2019-01-03 | 2020-12-15 | 유순경 | Aluminum alloy for die casting of door lock and manufacturing method thereof |
| CN110106404A (en) * | 2019-06-11 | 2019-08-09 | 天津圣金特汽车配件有限公司 | A kind of high-strength wearproof corrosion-resistant aluminium alloy and preparation method thereof |
| CN110938763A (en) * | 2019-12-13 | 2020-03-31 | 广州致远新材料科技有限公司 | Preparation method of die-casting aluminum alloy material capable of being anodized and die-casting method |
| CN110938763B (en) * | 2019-12-13 | 2021-05-11 | 广州致远新材料科技有限公司 | Preparation method of die-casting aluminum alloy material capable of being anodized and die-casting method |
| KR102264501B1 (en) | 2020-11-10 | 2021-06-23 | 최시은 | Aluminium alloy for die-casting capable of forming high quality oxide film by anodizing treatment |
| KR20220063541A (en) | 2020-11-10 | 2022-05-17 | 최시은 | Method for manufacturing aluminum alloy die-cast products with excellent appearance quality by anodizing treatment |
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