JPH05311310A - Mg-al or mg-al-zn alloy excellent in corrosion resistance - Google Patents
Mg-al or mg-al-zn alloy excellent in corrosion resistanceInfo
- Publication number
- JPH05311310A JPH05311310A JP14650692A JP14650692A JPH05311310A JP H05311310 A JPH05311310 A JP H05311310A JP 14650692 A JP14650692 A JP 14650692A JP 14650692 A JP14650692 A JP 14650692A JP H05311310 A JPH05311310 A JP H05311310A
- Authority
- JP
- Japan
- Prior art keywords
- alloy
- corrosion resistance
- nodular structure
- amount
- area ratio
- 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.)
- Withdrawn
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、耐食性を改善したＭｇ
−Ａｌ系またはＭｇ−Ａｌ−Ｚｎ系合金に関するもので
ある。FIELD OF THE INVENTION The present invention relates to Mg having improved corrosion resistance.
-Al-based or Mg-Al-Zn-based alloys.
【０００２】[0002]
【従来の技術】Ｍｇ合金は、宇宙材料、航空機、パソコ
ンのハードディスク周辺部品、レーシングマシーンのエ
ンジン回りおよびホイール等の様に、過酷な条件下で軽
量性と高強度性が要求される部分に採用されてきた。最
近では、一般自動車のハンドルの芯材やシートフレーム
等にも用いられ、需要は年々増加している。2. Description of the Related Art Mg alloys are used in space materials, aircraft, hard disk peripherals for personal computers, around engines and wheels in racing machines, where light weight and high strength are required under severe conditions. It has been. Recently, it has been used as a core material of a steering wheel of a general automobile, a seat frame and the like, and the demand is increasing year by year.
【０００３】しかしＭｇは本来活性な金属であるため、
錆が発生し、腐食し易いという問題がある。また、Ｍｇ
合金中に不純物として存在するＦｅ，Ｎｉ，Ｃｕ，Ｃｏ
等の重金属やこれらの金属間化合物等とＭｇとの間で電
位差が生じ、やはり発錆が起こり易い。このためＭｇ合
金を通常の環境で使用するに際しては、防錆を主目的と
した表面処理が不可欠となっている。However, since Mg is an active metal by nature,
There is a problem that rust is generated and easily corrodes. Also, Mg
Fe, Ni, Cu, Co existing as impurities in the alloy
There is a potential difference between heavy metals such as Mg and these intermetallic compounds and Mg, and rusting is likely to occur. Therefore, when the Mg alloy is used in a normal environment, surface treatment mainly for rust prevention is indispensable.
【０００４】このようなＭｇ合金の表面処理には、陽極
酸化処理、反応型クロメート処理等の化成処理や、エポ
キシ樹脂、アクリル樹脂等による樹脂被覆等が行なわれ
ているが、これらの表面処理ではその保護機能が永久的
とは言えず、また高腐食環境下でのＭｇ合金の使用には
信頼性が得られていないのが現状である。For such surface treatment of Mg alloy, chemical conversion treatment such as anodic oxidation treatment and reactive chromate treatment, resin coating with epoxy resin, acrylic resin and the like are carried out. It cannot be said that the protective function is permanent, and the reliability of the use of Mg alloys in highly corrosive environments has not been obtained.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記事情に着
目してなされたものであって、Ｍｇ合金自身の耐食性を
改善することを目的とする。The present invention has been made in view of the above circumstances, and an object thereof is to improve the corrosion resistance of the Mg alloy itself.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決すること
のできた本発明は、Ｍｇ合金がＡｌ： 2〜5.3 ％を含み
残部Ｍｇおよび不可避不純物であり、かつ該合金の任意
の切断面におけるノジュラー組織の面積比率が３％以上
であるか、またはＡｌ： 9.7〜12％を含み該ノジュラー
組織の面積比率が７％以上である耐食性に優れたＭｇ−
Ａｌ系合金であることを第一の要旨とし、必要によりこ
のＭｇ−Ａｌ系合金にＡｌ量より少ない量のＺｎを添加
したＭｇ−Ａｌ−Ｚｎ系合金であることを第二の要旨と
するものである。According to the present invention, which was able to solve the above problems, the Mg alloy contains Al: 2 to 5.3% and the balance is Mg and inevitable impurities, and the nodular at any cut surface of the alloy. Mg- which has an area ratio of the structure of 3% or more, or contains Al: 9.7 to 12% and has an area ratio of the nodular structure of 7% or more, which is excellent in corrosion resistance.
The first gist is that it is an Al-based alloy, and the second gist is that it is a Mg-Al-Zn-based alloy in which Zn is added to this Mg-Al-based alloy in an amount smaller than the amount of Al, if necessary. Is.
【０００７】[0007]
【作用】本発明は、上記組成を有するＭｇ−Ａｌ系また
はＭｇ−Ａｌ−Ｚｎ系合金中にノジュラー組織を人為的
に多く析出させることによって、耐食性を向上させたも
のである。以下、本発明を詳細に説明する。The present invention improves the corrosion resistance by artificially precipitating a large amount of nodular structure in the Mg-Al-based or Mg-Al-Zn-based alloy having the above composition. Hereinafter, the present invention will be described in detail.
【０００８】まず本発明でいうノジュラー組織とは、
Ｍｇ−Ａｌ系合金においては、Ｍｇ17Ａｌ12で表わすこ
とができる金属間化合物、もしくはこれと類似のＭｇ−
Ａｌ系金属間化合物とＭｇ合金からなる層状の組織を言
い、またＭｇ−Ａｌ−Ｚｎ系合金においては、Ｍｇ17
Ａｌ12、Ｍｇ32（Ａｌ・Ｚｎ）49、もしくはこれと類似
のＭｇ−Ａｌ系、またはＭｇ−Ａｌ−Ｚｎ系の金属間化
合物とＭｇ合金からなる層状の組織である。First, the nodular structure referred to in the present invention is
In a Mg-Al alloy, an intermetallic compound represented by Mg 17 Al 12 or a similar Mg-Al compound is used.
It refers to a layered structure composed of an Al-based intermetallic compound and a Mg alloy, and in the case of a Mg-Al-Zn-based alloy, Mg 17
It is a layered structure composed of Al 12 , Mg 32 (Al · Zn) 49 , or a similar Mg—Al-based or Mg—Al—Zn-based intermetallic compound and a Mg alloy.
【０００９】このノジュラー組織は溶解しにくいため、
Ｍｇ合金中に生じた腐食界面を覆うことができ、さらに
合金中のＦｅ，Ｎｉ，Ｃｕ，Ｃｏ等の不純物をノジュラ
ー組織の中に取り込んでしまうので、これらの不純物と
Ｍｇとの電位差を小さくすることが可能である。本発明
のＭｇ合金は、このような腐食界面を覆うバリヤー効果
と、不純物取り込み効果による不純物との電位差減少効
果によって、腐食の進行を抑制することができるのであ
る。Since this nodular structure is difficult to dissolve,
Since the corrosion interface generated in the Mg alloy can be covered and impurities such as Fe, Ni, Cu and Co in the alloy are taken into the nodular structure, the potential difference between these impurities and Mg is reduced. It is possible. The Mg alloy of the present invention can suppress the progress of corrosion due to the barrier effect of covering such a corrosion interface and the effect of reducing the potential difference between the impurities due to the effect of incorporating impurities.
【００１０】本発明のＭｇ合金では、Ａｌの含有量によ
って必要なノジュラー組織の量が異なる。Ｍｇ合金がＡ
ｌ： 2〜5.3 ％を含有し、残部Ｍｇおよび不可避不純物
である場合には、該合金の任意の切断面におけるノジュ
ラー組織の面積比率が３％以上必要である。また、Ａｌ
が 9.7〜12％の場合は、ノジュラー組織は７％以上析出
させることが必要である。ノジュラー組織がそれぞれの
面積比率より少ない場合は、前記のバリヤー効果や電位
差減少効果が発現しないため、耐食性を改善することが
難しい。In the Mg alloy of the present invention, the amount of nodular structure required varies depending on the content of Al. Mg alloy is A
When the content of Mg is 2 to 5.3% and the balance is Mg and unavoidable impurities, the area ratio of the nodular structure at any cut surface of the alloy must be 3% or more. Also, Al
When the ratio is 9.7 to 12%, it is necessary to precipitate 7% or more of the nodular structure. When the nodular structure is smaller than the area ratio, the barrier effect and the potential difference reducing effect are not exhibited, and it is difficult to improve the corrosion resistance.
【００１１】ノジュラー組織は粒界および粒内に析出す
るものであるが、Ａｌ、Ｚｎ等の合金元素の添加や、熱
処理、あるいは冷却速度の制御等の方法によって得るこ
とができる。ノジュラー組織の析出量は合金元素添加量
によって異なり、例えば熱処理なしの砂型材の場合では
約０〜17％となって、熱処理等を行なうことによってノ
ジュラー組織を任意に制御することができる。また、溶
体化処理後に時効処理を行なえば、均質なノジュラー組
織を得ることができる。The nodular structure precipitates at grain boundaries and within grains, but can be obtained by adding alloy elements such as Al and Zn, heat treatment, or controlling the cooling rate. The amount of precipitation of the nodular structure varies depending on the amount of alloying element added, and is, for example, about 0 to 17% in the case of the sand mold material without heat treatment, and the nodular structure can be arbitrarily controlled by performing heat treatment or the like. Further, if the aging treatment is performed after the solution treatment, a homogeneous nodular structure can be obtained.
【００１２】ＡｌおよびＺｎ等の合金元素の添加量は、
多ければ多いほどノジュラー組織の析出量が増加するた
め多い方が好ましいが、Ａｌには固溶限度があるため、
上限を12％とした。ＺｎをＡｌより多く添加するとＭｇ
−Ａｌ−Ｚｎ系金属間化合物の形成を妨げるため、Ｚｎ
＜Ａｌ量とした。The addition amount of alloying elements such as Al and Zn is
The larger the amount, the more the amount of precipitation of the nodular structure increases, so the larger the amount, the better. However, since Al has a solid solution limit,
The upper limit was 12%. If Zn is added more than Al, Mg
In order to prevent the formation of a -Al-Zn intermetallic compound, Zn
<Al amount.
【００１３】Ｍｇ合金は一般的にＦｅ、Ｎｉ、Ｃｕ等の
不純物を含むと耐食性が極端に悪化するため、本発明に
おいても従来のＭｇ合金と同レベルの不純物含有量とす
ることが要求され、Ｆｅ＜0.01％，Ｎｉ＜0.01％，Ｃｕ
＜0.1 ％とするのが好ましい。In general, when Mg alloy contains impurities such as Fe, Ni and Cu, the corrosion resistance is extremely deteriorated. Therefore, in the present invention, it is required to have the same impurity content as that of the conventional Mg alloy. Fe <0.01%, Ni <0.01%, Cu
<0.1% is preferable.
【００１４】本発明のＭｇ合金は、上記Ａｌ、Ｚｎの他
に若干の第３元素を許容するが、中でもＭｎ，Ｓｉ等を
添加することはそれぞれ有用な効果を生じる。Ｍｎは溶
湯中の不純物であるＦｅを除去する効果を有するが、Ｍ
ｎ自体は耐食性を悪化させる働きがあるので１％以下の
添加が好ましい。Ｓｉは、合金の機械的強度を向上させ
るが、やはりＳｉ自体はＭｇ合金の耐食性を悪化させる
傾向があるため0.4 ％以下の添加が好ましい。The Mg alloy of the present invention allows a small amount of a third element in addition to the above Al and Zn, and the addition of Mn, Si and the like produces useful effects. Mn has the effect of removing Fe, which is an impurity in the molten metal, but M
Since n itself has a function of deteriorating the corrosion resistance, addition of 1% or less is preferable. Si improves the mechanical strength of the alloy, but since Si itself tends to deteriorate the corrosion resistance of the Mg alloy, addition of 0.4% or less is preferable.
【００１５】また、ノジュラー組織の析出を妨げない範
囲であれば、上記の添加元素以外に一般的なＭｇ合金添
加元素であるＡｇ，Ｚｒ，ＲＥ等を添加しても良い。ま
た本発明のＭｇ合金は、砂型材の他に、ダイカスト材、
金型材を採用することもできる。In addition to the above-mentioned additive elements, general Mg alloy additive elements such as Ag, Zr and RE may be added as long as the precipitation of the nodular structure is not hindered. In addition to the sand mold material, the Mg alloy of the present invention is a die cast material,
A mold material can also be adopted.
【００１６】[0016]
【実施例】以下、本発明を実施例によって具体的に説明
する。実施例１〜８および比較例１〜２ 純度99.999％の電解Ｍｇを溶解し、表１に示した組成に
なるように高純度Ａｌおよび高純度Ｚｎを添加し、調整
後砂型鋳型で鋳造し空冷した。耐食性は塩水噴霧試験(J
IS Z2371) に準じて行ない、５日間試験後の腐食減量を
測定して評価した。結果を表１に併記した。EXAMPLES The present invention will be specifically described below with reference to examples. Examples 1 to 8 and Comparative Examples 1 to 2 Electrolytic Mg having a purity of 99.999% was dissolved, high-purity Al and high-purity Zn were added so as to have the composition shown in Table 1, and after adjustment, casting was performed in a sand mold and air cooling. did. Corrosion resistance is determined by salt spray test (J
According to IS Z2371), the corrosion weight loss after 5 days of the test was measured and evaluated. The results are also shown in Table 1.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【発明の効果】本発明のＭｇ−Ａｌ系またはＭｇ−Ａｌ
−Ｚｎ系合金は、ノジュラー組織を人為的に析出させる
ことによって、腐食部分を包み込むバリヤー効果とＭｇ
合金中の不純物との電位差を減少させる効果が発現し、
著しく耐食性に優れたものとなった。EFFECT OF THE INVENTION Mg-Al system or Mg-Al of the present invention
-Zn-based alloys have a barrier effect of encapsulating a corroded portion and Mg by artificially precipitating a nodular structure.
The effect of reducing the potential difference with impurities in the alloy is developed,
It became extremely excellent in corrosion resistance.
フロントページの続き (72)発明者 浅川 義彦 神戸市西区高塚台１丁目５番５号 株式会 社神戸製鋼所神戸総合技術研究所内Continued Front Page (72) Inventor Yoshihiko Asakawa 1-5-5 Takatsukadai, Nishi-ku, Kobe City Kobe Steel, Ltd. Kobe Research Institute
Claims (3)
同じ）を含み、残部Ｍｇおよび不可避不純物よりなるＭ
ｇ合金において、該合金の任意の切断面におけるノジュ
ラー組織の面積比率が３％以上であることを特徴とする
耐食性に優れたＭｇ−Ａｌ系合金。1. Al: M containing 2 to 5.3% (meaning weight%, the same applies hereinafter), and the balance Mg and unavoidable impurities.
In the g-alloy, the area ratio of the nodular structure in any cut surface of the alloy is 3% or more, and a Mg-Al based alloy excellent in corrosion resistance.
び不可避不純物よりなるＭｇ合金において、該合金の任
意の切断面におけるノジュラー組織の面積比率が７％以
上であることを特徴とする耐食性に優れたＭｇ−Ａｌ系
合金。2. A corrosion resistance, characterized in that in an Mg alloy containing Al: 9.7 to 12% and the balance being Mg and unavoidable impurities, the area ratio of the nodular structure at any cut surface of the alloy is 7% or more. Excellent Mg-Al alloy.
１または２に記載の耐食性に優れたＭｇ−Ａｌ−Ｚｎ系
合金。3. The Mg-Al-Zn-based alloy excellent in corrosion resistance according to claim 1, which contains Zn in an amount smaller than the amount of Al.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14650692A JPH05311310A (en) | 1992-05-11 | 1992-05-11 | Mg-al or mg-al-zn alloy excellent in corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14650692A JPH05311310A (en) | 1992-05-11 | 1992-05-11 | Mg-al or mg-al-zn alloy excellent in corrosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05311310A true JPH05311310A (en) | 1993-11-22 |
Family
ID=15409175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14650692A Withdrawn JPH05311310A (en) | 1992-05-11 | 1992-05-11 | Mg-al or mg-al-zn alloy excellent in corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05311310A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009148093A1 (en) * | 2008-06-03 | 2009-12-10 | 独立行政法人物質・材料研究機構 | Mg-BASE ALLOY |
| WO2010082669A1 (en) * | 2009-01-19 | 2010-07-22 | 独立行政法人物質・材料研究機構 | Mg-BASE ALLOY |
| JP2011021274A (en) * | 2009-06-17 | 2011-02-03 | Toyota Central R&D Labs Inc | Recycled magnesium alloy, method for producing the same and magnesium alloy |
-
1992
- 1992-05-11 JP JP14650692A patent/JPH05311310A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009148093A1 (en) * | 2008-06-03 | 2009-12-10 | 独立行政法人物質・材料研究機構 | Mg-BASE ALLOY |
| US8313692B2 (en) | 2008-06-03 | 2012-11-20 | National Institute For Materials Science | Mg-based alloy |
| JP5540415B2 (en) * | 2008-06-03 | 2014-07-02 | 独立行政法人物質・材料研究機構 | Mg-based alloy |
| WO2010082669A1 (en) * | 2009-01-19 | 2010-07-22 | 独立行政法人物質・材料研究機構 | Mg-BASE ALLOY |
| CN102282277A (en) * | 2009-01-19 | 2011-12-14 | 独立行政法人物质·材料研究机构 | Mg-base alloy |
| JP5586027B2 (en) * | 2009-01-19 | 2014-09-10 | 独立行政法人物質・材料研究機構 | Mg-based alloy |
| US9347123B2 (en) | 2009-01-19 | 2016-05-24 | National Institute For Materials Science | Mg-base alloy |
| JP2011021274A (en) * | 2009-06-17 | 2011-02-03 | Toyota Central R&D Labs Inc | Recycled magnesium alloy, method for producing the same and magnesium alloy |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2007534839A (en) | Heat-treatable Al-Zn-Mg alloys for aerospace and automotive castings | |
| JPH05156400A (en) | Hyper-eutectic aluminum silicon alloy | |
| JP3916452B2 (en) | High corrosion resistance magnesium alloy and method for producing the same | |
| US4908181A (en) | Ingot cast magnesium alloys with improved corrosion resistance | |
| US5415710A (en) | Heat-resistant aluminum alloy having high fatigue strength | |
| JP2541412B2 (en) | Aluminum alloy for die casting | |
| JPH05311310A (en) | Mg-al or mg-al-zn alloy excellent in corrosion resistance | |
| JP4356851B2 (en) | Aluminum die-casting material for ships | |
| JPH07145440A (en) | Aluminum alloy forging stock | |
| JPH07126790A (en) | Highly corrosion resistant mg-base alloy | |
| JPH0543776B2 (en) | ||
| US5139077A (en) | Ingot cast magnesium alloys with improved corrosion resistance | |
| JP4352127B2 (en) | High performance magnesium alloy and method for producing the same | |
| JPS61238935A (en) | Alloy for bearing | |
| JPH06228698A (en) | Mg base alloy excellent in corrosion resistance | |
| US2420293A (en) | Magnesium base alloys | |
| JPH07331375A (en) | Heat resistant magnesium alloy for casting | |
| Boyko et al. | The effect of alloying additions on the structure and properties of Al-Mg-Si-Mn casting alloy–A review | |
| JPH04311545A (en) | Al-mg-si alloy having superior strength and ductility | |
| JP3242493B2 (en) | Heat resistant magnesium alloy | |
| JP3920656B2 (en) | High rigidity aluminum alloy containing boron | |
| KR101807799B1 (en) | Al-Si casting alloy and method for fabricating the same | |
| JPH06235041A (en) | Magnesium base alloy for casting excellent in heat resistance | |
| KR102346994B1 (en) | Al-Zn-Cu alloy with high wear resistance and article using the same | |
| JP3132693B2 (en) | Magnesium alloy for die casting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990803 |