JPH0565572B2 - - Google Patents
Info
- Publication number
- JPH0565572B2 JPH0565572B2 JP62010823A JP1082387A JPH0565572B2 JP H0565572 B2 JPH0565572 B2 JP H0565572B2 JP 62010823 A JP62010823 A JP 62010823A JP 1082387 A JP1082387 A JP 1082387A JP H0565572 B2 JPH0565572 B2 JP H0565572B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- corrosion resistance
- casting
- strength
- alloys
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000005260 corrosion Methods 0.000 claims description 19
- 230000007797 corrosion Effects 0.000 claims description 19
- 238000004512 die casting Methods 0.000 claims description 12
- 229910000838 Al alloy Inorganic materials 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 description 18
- 239000000956 alloy Substances 0.000 description 18
- 229910018134 Al-Mg Inorganic materials 0.000 description 8
- 229910018467 Al—Mg Inorganic materials 0.000 description 8
- 238000005266 casting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 229910018594 Si-Cu Inorganic materials 0.000 description 2
- 229910008465 Si—Cu Inorganic materials 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000012925 reference material Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910018580 Al—Zr Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
Description
〔産業上の利用分野〕
本発明は耐蝕性ダイカスト用アルミニウム合金
に関する。
〔従来の技術〕
従来、構造材としてのダイカスト用アルミニウ
ム合金としては、Al−Si−Cu系のJIS ADC10、
ADC12が一般的に知られており、又耐蝕性ダイ
カスト用アルミイニウム合金としては、Al−Mg
系合金のADC5、ADC6がJISに規格化されてい
る。
〔発明が解決しようとする問題点〕
上記Al−Si−Cu系合金は、ダイカスト性に優
れ、高強度を有していることから複雑な形状をも
つ薄肉鋳物の製造に適しているが、その反面耐蝕
性が劣る為、過酷な腐食環境下にさらされる建築
用外装品や化学装置用部品には使用できず、耐蝕
性が要求される場合には塗装、金属メツキ等の表
面処理を施す必要がある。
一方、上記ADC5、ADC6は耐蝕性を必要とす
る部分の鋳物やアルマイト用合金として広く使用
されており、Al−Mg2元合金は、工業用純Alに
近い優れた耐蝕性をもつが、金型への焼き付きが
激しく、Mg合金化によつて凝固温度範囲が広が
る為、鋳造割れ、湯流れ性に問題があり、それ
故、ADC6では１％以下のSiと微量のMn、Feを
添加することによつて鋳造性を改善すると共に強
度の向上をはかり実用に供している。
又、ADC5では、1.8％以下のFeを添加するこ
とによつて金型への焼き付きを抑制し、ダイカス
トを可能にしている。
このように、Al−Mg系ダイカスト用合金は、
耐蝕性を損なわずに鋳造性及び強度を向上させる
為に比較的少量のSi、Fe、Mn等の元素を単独、
あるいは複合添加して実用合金としている。
しかしながら、耐蝕性に主眼をおくこれらの合
金は、ADC10、ADC12に比べ引張強度、耐力、
弾性率が全般的に低い為、ケースやカバー等の装
飾部品には使用し得るものゝ構造材としては適用
範囲が制限される問題点がある。
本発明は上記従来の問題点を解消しようとした
もので、従来、Al−Mg系合金において、Mnは
微量添加されるにとゞまつていたが、本発明では
Mg：50〜8wt％を含むAl基合金に、共晶点組成
に近い2wt％前後のMnを添加することにより、
合金中に金属間化合物Al6Mnを形成させ、引張
強度、弾性率を向上させると共に、Al6Mn中に
Fe等の耐蝕性に有害な元素を固溶するので耐蝕
性が向上し、更にMnの添加によつてAl−Mg系
合金の鋳造性を改善し得るようにした優れた耐蝕
性と構造材として使用し得る高強度を有するダイ
カスト用アルミニウム合金を提供することを、そ
の目的とする。
〔問題点を解決する為の手段〕
即ち本発明は、Mn：2.04〜3.0wt％と、Mg5.0
〜8.0wt％とを含有し、残部がAl及び不可避的不
純物からなり、もつて上記問題点を解決したので
ある。
次に本発明合金の組成範囲につき詳述する。
Mg：5.0〜8wt％、Mn：2.04〜3.0wt％、残部
をAlと不可避的不純物とする。
又、Mg：5.0〜8wt％、Mn：2.04〜3.0wt％に、
Ti：0.01〜0.3wt％、Ｂ：0.001〜0.1wt％、Zr：
0.01〜0.3wt％のうち何れか一種又は二種以上を
含有し、残部をAlと不可避的不純物とする。
Al−Mg系合金において、Mnを共晶点組成に
近い2wt％前後添加すると、合金中に金属曲化合
物Al6Mnを形成させ、引張強度、弾性率が向上
する。又Al6Mn中にFe等の耐蝕性に有害な元素
を固溶するから耐蝕性は向上する。更にMnの添
加はAl−Mg系合金の鋳造性を改善する効果があ
るが、Mnの含有範囲が2.04wt％以下では、上述
の効果は少なく、3.0wt％を越えると粗大な初晶
Al6Mnが晶出し機械的性質、被切削性を劣下さ
せる為、含有範囲は1.8wt％≦Mn≦3.0wt％とす
る。
Mgの添加は、合金の耐蝕性を損なわずに強
度、硬さを増大させることができる。
しかし、5.0wt％以下の含有では十分な強度が
得られず、8wt％以上含有するとMgの偏析が激
しくなり、Al−Mg系の化合物を形成し、逆に機
械的性質が劣下する。
TiはＢの添加と相俟つて結晶粒微細化に著し
い効果を有し、鋳造性の改善に有効である。
又、Ti：0.01wt％、Ｂ：0.001wt％以下では、
その効果は少なく、Ti：0.3wt％、Ｂ：0.1wt％
以上では脆い化合物を形成する為、靭性を低下さ
せる。
Zrは、Ti、Ｂと同様に結晶粒微細化の効果を
もち、鋳造性、特に鋳造割れ防止に有効であり、
0.01wt％居合の含有では、その効果は見られず、
0.3wt％以上含むとAl−Zr系の化合物を形成し、
機械的性質が劣化する。
〔実施例〕
以下本発明の実施例を比較例を詳述する。
下記の表−１に示す組成の合金容易を90tonダ
イカストマシンを用いて鋳込温度730〜750℃、金
型温度110〜150℃、射出速度1.3〜1.5ｍ／ｓ、鋳
込圧760Kgｆ／cm2、チルタイム５秒の条件で鋳造
し、試料No.１〜11を得た。
他にJIS規格によるADC10合金、ADC6合金を
用いて上記と同一条件で鋳造し、参考材を得た。
尚、表−１中Si及びFeは不可避的不純物である。
[Industrial Field of Application] The present invention relates to a corrosion-resistant aluminum alloy for die casting. [Prior art] Conventionally, aluminum alloys for die casting as structural materials include Al-Si-Cu based JIS ADC10,
ADC12 is generally known, and Al-Mg
The ADC5 and ADC6 alloys are standardized by JIS. [Problems to be solved by the invention] The Al-Si-Cu alloy has excellent die-casting properties and high strength, making it suitable for manufacturing thin-walled castings with complex shapes. On the other hand, due to its poor corrosion resistance, it cannot be used for architectural exterior parts or parts for chemical equipment that are exposed to harsh corrosive environments.If corrosion resistance is required, surface treatment such as painting or metal plating must be applied. There is. On the other hand, the above ADC5 and ADC6 are widely used as alloys for castings and alumite for parts that require corrosion resistance, and the Al-Mg binary alloy has excellent corrosion resistance close to that of industrial pure Al, but it As the solidification temperature range expands due to Mg alloying, there are problems with casting cracks and melt flow.Therefore, in ADC6, less than 1% Si and trace amounts of Mn and Fe are added. This method has been used to improve castability and strength, and is now in practical use. Furthermore, in ADC5, by adding 1.8% or less Fe, seizure to the mold is suppressed and die casting is possible. In this way, the Al-Mg alloy for die casting is
In order to improve castability and strength without sacrificing corrosion resistance, relatively small amounts of elements such as Si, Fe, and Mn are added alone.
Alternatively, they are added in combination to create a practical alloy. However, these alloys, which focus on corrosion resistance, have lower tensile strength, yield strength, and
Since the modulus of elasticity is generally low, it can be used for decorative parts such as cases and covers, but there is a problem that the range of application as a structural material is limited. The present invention aims to solve the above-mentioned conventional problems. Conventionally, Mn was expected to be added in a small amount to Al-Mg alloys, but in the present invention, Mn was added in a small amount.
Mg: By adding around 2wt% of Mn, which is close to the eutectic point composition, to an Al-based alloy containing 50 to 8wt%,
The intermetallic compound Al 6 Mn is formed in the alloy to improve the tensile strength and elastic modulus.
Corrosion resistance is improved by dissolving elements harmful to corrosion resistance such as Fe, and the castability of Al-Mg alloys can be improved by adding Mn.It has excellent corrosion resistance and can be used as a structural material. The object is to provide an aluminum alloy for die casting that has high strength and can be used. [Means for solving the problem] That is, the present invention has Mn: 2.04 to 3.0wt% and Mg5.0
~8.0wt%, with the remainder consisting of Al and unavoidable impurities, thus solving the above problem. Next, the composition range of the alloy of the present invention will be explained in detail. Mg: 5.0 to 8 wt%, Mn: 2.04 to 3.0 wt%, the remainder being Al and inevitable impurities. In addition, Mg: 5.0 to 8 wt%, Mn: 2.04 to 3.0 wt%,
Ti: 0.01-0.3wt%, B: 0.001-0.1wt%, Zr:
It contains one or more of 0.01 to 0.3 wt%, and the remainder is Al and inevitable impurities. In an Al-Mg alloy, when Mn is added at around 2 wt%, which is close to the eutectic point composition, a metal bending compound Al 6 Mn is formed in the alloy, improving tensile strength and elastic modulus. In addition, since elements harmful to corrosion resistance such as Fe are dissolved in Al 6 Mn, corrosion resistance is improved. Furthermore, the addition of Mn has the effect of improving the castability of Al-Mg alloys, but if the Mn content range is 2.04wt% or less, the above effect is small, and if it exceeds 3.0wt%, coarse primary crystals will be produced.
Since Al 6 Mn crystallizes and deteriorates mechanical properties and machinability, the content range is 1.8wt%≦Mn≦3.0wt%. Addition of Mg can increase the strength and hardness of the alloy without impairing its corrosion resistance. However, if the content is less than 5.0 wt%, sufficient strength cannot be obtained, and if the content is more than 8 wt%, the segregation of Mg becomes severe, forming Al-Mg-based compounds, and conversely, the mechanical properties deteriorate. Together with the addition of B, Ti has a remarkable effect on grain refinement and is effective in improving castability. Also, if Ti: 0.01wt% and B: 0.001wt% or less,
The effect is small, Ti: 0.3wt%, B: 0.1wt%
Above this amount, a brittle compound is formed, resulting in a decrease in toughness. Like Ti and B, Zr has the effect of refining grains, and is effective in improving castability, especially preventing cracking in casting.
No effect was observed with 0.01wt% Iaido content.
If it contains 0.3wt% or more, Al-Zr-based compounds are formed,
Mechanical properties deteriorate. [Example] Examples of the present invention and comparative examples will be described in detail below. An alloy having the composition shown in Table 1 below was cast using a 90 ton die casting machine at a casting temperature of 730 to 750°C, a mold temperature of 110 to 150°C, an injection speed of 1.3 to 1.5 m/s, and a casting pressure of 760 Kgf/cm 2 , and sample Nos. 1 to 11 were obtained by casting under conditions of a chill time of 5 seconds. In addition, reference materials were obtained by casting ADC10 alloy and ADC6 alloy according to JIS standards under the same conditions as above.
In addition, Si and Fe in Table 1 are unavoidable impurities.
【表】【table】
【表】
上記試料No.１〜11及び参考材を用いて以下の実
験を行なつた。その結果を下記の表−２、表−３
に示す。[Table] The following experiments were conducted using the above samples No. 1 to 11 and reference materials. The results are shown in Table-2 and Table-3 below.
Shown below.
【表】【table】
以上説明したように本発明に係る耐蝕性ダイカ
スト用アルミニウム合金は、従来の耐蝕性ダイカ
スト用アルミニウム合金に比べて引張強度、耐力
が増強されるので伸び、耐蝕性が良好であり、為
に耐蝕性、強度が要求される構造材、外装部材に
適し、広範な用途に利用できる利点がある。
As explained above, the corrosion-resistant aluminum alloy for die-casting according to the present invention has increased tensile strength and yield strength compared to conventional corrosion-resistant aluminum alloys for die-casting, so it elongates and has good corrosion resistance. It has the advantage of being suitable for structural materials and exterior members that require strength, and can be used in a wide range of applications.
添付図面は本発明に係る耐蝕性ダイカスト用ア
ルミニウム合金を用いて鋳造した試料No.２の凝固
組織の光学顕微鏡写真を示す。
The attached drawing shows an optical micrograph of the solidified structure of sample No. 2 cast using the corrosion-resistant aluminum alloy for die casting according to the present invention.
Claims (1)
とを含有し、残部がAl及び不可避的不純物から
なることを特徴とする耐蝕性ダイカスト用アルミ
ニウム合金。 ２ Mn：2.04〜3.0wt％と、Mg：5.0〜8.0wt％
の外にTi：0.01〜0.3wt％、Ｂ：0.001〜0.1wt％、
Zr：0.01〜0.3wt％のうち何れか一種又は二種以
上を含有し、残部がAl及び不可避的不純物から
なることを特徴とする耐蝕性ダイカスト用アルミ
ニウム合金。[Claims] 1 Mn: 2.04 to 3.0 wt%, Mg: 5.0 to 8.0 wt%
1. A corrosion-resistant aluminum alloy for die casting, characterized in that the remainder consists of Al and unavoidable impurities. 2 Mn: 2.04-3.0wt%, Mg: 5.0-8.0wt%
Besides Ti: 0.01~0.3wt%, B: 0.001~0.1wt%,
A corrosion-resistant aluminum alloy for die casting, characterized in that it contains one or more of Zr: 0.01 to 0.3 wt%, and the remainder consists of Al and inevitable impurities.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1082387A JPS63179042A (en) | 1987-01-19 | 1987-01-19 | Corrosion-resisting aluminum alloy for die casting |
| US07/076,435 US4847048A (en) | 1986-07-21 | 1987-07-21 | Aluminum die-casting alloys |
| US07/351,886 US4976918A (en) | 1986-07-21 | 1989-05-15 | Aluminum die-casting alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1082387A JPS63179042A (en) | 1987-01-19 | 1987-01-19 | Corrosion-resisting aluminum alloy for die casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63179042A JPS63179042A (en) | 1988-07-23 |
| JPH0565572B2 true JPH0565572B2 (en) | 1993-09-20 |
Family
ID=11761075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1082387A Granted JPS63179042A (en) | 1986-07-21 | 1987-01-19 | Corrosion-resisting aluminum alloy for die casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63179042A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6900199B2 (en) * | 2017-02-10 | 2021-07-07 | エス・エス・アルミ株式会社 | Manufacturing method of aluminum alloy for casting, aluminum alloy casting products and aluminum alloy casting products |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5496445A (en) * | 1978-01-18 | 1979-07-30 | Hitachi Cable Ltd | Anticorrosive treating method for structure to seawater |
-
1987
- 1987-01-19 JP JP1082387A patent/JPS63179042A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5496445A (en) * | 1978-01-18 | 1979-07-30 | Hitachi Cable Ltd | Anticorrosive treating method for structure to seawater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63179042A (en) | 1988-07-23 |
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