JPS6371925A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPS6371925A JPS6371925A JP21858886A JP21858886A JPS6371925A JP S6371925 A JPS6371925 A JP S6371925A JP 21858886 A JP21858886 A JP 21858886A JP 21858886 A JP21858886 A JP 21858886A JP S6371925 A JPS6371925 A JP S6371925A
- Authority
- JP
- Japan
- Prior art keywords
- recording medium
- film
- substrate
- magnetic recording
- magnetic
- 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.)
- Pending
Links
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は磁気ディスク装置用の磁気記録媒体、特にそ
の耐食性の向上に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording medium for a magnetic disk device, and particularly to improvement of its corrosion resistance.
現在、磁気ディスク装置に筺用されてｂる磁気記録媒体
は、強磁性酸化物粒子と有磯樹脂結合剤とをアルミ基板
に塗布して作られる塗布鳳記録媒体が主流である。しか
し、近年磁気記録媒体の高密度化に伴いスパッタリング
、めっき等の薄膜形成法による金属薄膜型磁気記録媒体
が実用化され始めている。Currently, the mainstream of magnetic recording media used in magnetic disk drives is coated recording media made by coating ferromagnetic oxide particles and an Ariso resin binder on an aluminum substrate. However, in recent years, as the density of magnetic recording media has increased, metal thin film magnetic recording media using thin film forming methods such as sputtering and plating have begun to be put into practical use.
第２図は例えば特公昭４５−４５９３号公報に示された
従来の磁気記録媒体を示す断面図である。図において、
（１）はその表面がｋｌｌ−′ｐ めっきされたもの
あるいはその表面を陽甑酸化処理し７ヒアルミ合金材料
からなる基板、（２）は基板（１）の端部を残して付着
されたＣｏ −ＮｉあるいはＣ！Ｏ−Ｐ等の合金薄膜か
らなる磁性膜、（３）は磁性膜（２）を覆って討食性及
び耐摩耗性を有するクロムからなる保護膜である。以上
のように構成された磁気記録媒体は磁気ディスク装置（
図示せず）に収納され、情報の記録再生が行われる。し
かし、磁気ディスク装置内の空気に含まれ次水分が、基
板（１）と保護膜（３）との異種金属接合腐食媒体て反
応する。そしてこの反応によって、第３図の磁気記録媒
体の端部の詳細図に示されるように、最終的に水酸化物
又は酸化物等を形成するアノード反応
Ｍ −ｈ Ｍ” ＋ ｆＪｅ−
及び、これによって生じるｅ−を消費するカソード反応
２Ｈ” ＋ ２ｅ−−ｅ ＩＨ２
いＯ，＋ Ｎ２０ ＋ ２θ−→０ＩＩＩ−等が基板（
１）と保護膜（３）との間に発生する。このようにして
、アノード反応とカソード反応の組合せにより、基板（
１）と保護膜（３）との間で異種金属接合腐食（５）が
容易に生じ、その結果、地部に起こる腐食（５）が磁気
ディスク装置の信頼性を低下させていた。しかし、現在
このような化学的劣化に対する対策がとられておらず、
磁気記録媒体の端部を保護し比例としては特開昭６０−
２０９９２０号公報に示されたような、機械的な損傷を
防ぐ目的で端部の保護、すなわち、磁性膜の端部の傷や
はがれ等の保護だけが行われてい念。FIG. 2 is a sectional view showing a conventional magnetic recording medium disclosed in, for example, Japanese Patent Publication No. 45-4593. In the figure,
(1) is a substrate whose surface is plated with KLL-'P or whose surface is anodic oxidized and is made of a 7-hyaluminum alloy material, (2) is a substrate with Co adhered to it leaving the edges of the substrate (1). -Ni or C! The magnetic film (3) is made of a thin alloy film such as O-P, and is a protective film made of chromium that covers the magnetic film (2) and has corrosion resistance and wear resistance. The magnetic recording medium configured as described above is a magnetic disk device (
(not shown), and information is recorded and reproduced. However, the moisture contained in the air inside the magnetic disk drive reacts with a corrosive medium on the dissimilar metal bond between the substrate (1) and the protective film (3). As a result of this reaction, as shown in the detailed view of the edge of the magnetic recording medium in FIG. The cathode reaction 2H" + 2e--e IH2 O, + N20 + 2θ-→0III-, etc., which consumes the e- produced by
1) and the protective film (3). In this way, the combination of anodic and cathodic reactions allows the substrate (
Dissimilar metal junction corrosion (5) easily occurs between 1) and the protective film (3), and as a result, corrosion (5) occurring at the base reduces the reliability of the magnetic disk drive. However, no measures are currently being taken to prevent such chemical deterioration.
To protect the edge of a magnetic recording medium and to be proportional, JP-A-60-
As shown in Japanese Patent Publication No. 209920, it is important to note that edge protection is only performed to prevent mechanical damage, that is, protection against scratches and peeling of the magnetic film edges.
従来の磁気記録媒体は以上のように構成されているので
、基板（１）の端部に異った材料となる保護膜（３）と
の境界部が露出しており、保護膜（３）は磁気ディスク
装置内の空気との接触により空気中に含まれた水分と反
応し、異種金属接合腐食（５）が生じるという問題点が
あった。Since the conventional magnetic recording medium is constructed as described above, the boundary between the protective film (3) made of a different material is exposed at the edge of the substrate (1), and the protective film (3) is made of a different material. There is a problem in that when it comes into contact with the air inside the magnetic disk drive, it reacts with moisture contained in the air, causing dissimilar metal joint corrosion (5).
この発明は上記のような問題点を解消するためになされ
たもので基板端部において異種金属接合腐食が発生しに
くい磁気記録媒体を得ることを目的とする。The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a magnetic recording medium in which corrosion of dissimilar metal junctions is less likely to occur at the edge of a substrate.
この発明に係る磁気記録媒体は基板上に端部を残して形
成され之磁性膜を覆って保護膜を形成し、磁性膜の少な
くとも縁部と基板との間及び基板の端部に保護膜とはｙ
同じ腐食電位を持つ物質からなる被覆膜を形成したもの
である。The magnetic recording medium according to the present invention is formed on a substrate with an edge left, and a protective film is formed covering the magnetic film, and a protective film is formed between at least the edge of the magnetic film and the substrate and at the edge of the substrate. Yes
A coating film made of substances with the same corrosion potential is formed.
この発明における磁気記録媒体は磁性膜の少なくとも縁
部と基板との間及び基板の端部に保護膜とほゞ同じ腐食
電位を持つ被覆膜を形成することにより、腐食電位がは
ソ同じとなる。The magnetic recording medium of the present invention has a coating film having approximately the same corrosion potential as the protective film between at least the edge of the magnetic film and the substrate and at the edge of the substrate, so that the corrosion potential is almost the same. Become.
以下、この発明の一実施例を図について説明する。第１
図において、（１）〜（３）は上記従来例と同様のもの
である。（４）は基板（１）と磁性膜（２）の外周縁部
（２ａ）との間及び基板（１）の外周端部に予め形成さ
れた保護膜（３）と同じ腐食電位を持つクロムわらなる
被覆膜である。An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (1) to (3) are similar to the conventional example described above. (4) is chrome having the same corrosion potential as the protective film (3) formed in advance between the substrate (1) and the outer peripheral edge (2a) of the magnetic film (2) and on the outer peripheral edge of the substrate (1). It is a covering film made of straw.
以上のように構成された磁気記鎌媒体は次のように作製
される。まず、アルミ合金にＮ１−ｐめっきあるいは陽
極酸化処理をした基板（１）を作製し、この基板（１）
の外周端部にクロムからなる被覆膜（４）を形成する。The magnetic recording medium configured as described above is manufactured as follows. First, a substrate (1) is made of aluminum alloy with N1-p plating or anodizing treatment, and this substrate (1)
A coating film (4) made of chromium is formed on the outer circumferential end of.
その後、Ｃｏ −Ｎｉの磁性膜（２）を基板（１］の端
部を残し、被覆膜（４）に少し被えるように基ｒｉ、（
１）に形成し、さらに、磁性膜（２）を覆って保護膜（
３）を形成する。このようにして基板（１）の外周端部
に腐食電位の異なる金属接合部をなくすることがある。Thereafter, a magnetic film (2) of Co-Ni is placed on the base ri, (
1), and then a protective film (2) is formed to cover the magnetic film (2).
3) Form. In this way, metal joints with different corrosion potentials may be eliminated at the outer peripheral edge of the substrate (1).
以上のように作製された磁気記録媒体を温度６０℃、相
対湿度８０％の条件で腐食試験を行い、肉眼で腐食痕が
検知できるまでの時間を従来のものと比較したところ、
本発明による磁気記録媒体は従来のものに比べて４倍の
期間を要し念。The magnetic recording medium produced as described above was subjected to a corrosion test at a temperature of 60°C and a relative humidity of 80%, and the time required for corrosion marks to be detected with the naked eye was compared with that of a conventional one.
The magnetic recording medium according to the present invention requires four times as much time as the conventional one.
なお、上記実施例においては、基板（１）をアルミ基板
で説明したが、材料はアルミ合金であればよい０
また、磁性膜（２）をＧｏ −Ｎｉあるいはａｏ −’
ｐ等の材料で示し念がこれ以外の磁性膜材料であっても
よい。In the above embodiment, the substrate (1) is described as an aluminum substrate, but the material may be any aluminum alloy.
The magnetic film may be made of a material such as p, but other magnetic film materials may be used.
また、保護膜（３）をクロムを下地とした炭素膜で示し
たが、これ以外の保護膜でもよい。また、このクロム膜
の上に炭素膜を形成すれば潤滑によいことは一般的に知
られてｂることである。Further, although the protective film (3) is shown as a carbon film with a chromium base, other protective films may be used. It is also generally known that forming a carbon film on top of the chromium film is good for lubrication.
また、基板（１）の外周端部にのみ被覆膜（４）を予め
形成し念ものにつ１ハて説明したが、内周端部に予め形
成することは当然である。さらに、基板（１）の全面に
被覆膜（４）を形成してもよい。Moreover, although the coating film (4) was previously formed only on the outer circumferential edge of the substrate (1) and was explained as a precaution, it is of course possible to form it on the inner circumferential edge in advance. Furthermore, a coating film (4) may be formed on the entire surface of the substrate (1).
また、被覆膜（４）はクロム膜で示したが、これ以外に
保護膜（３）とはｙ同じ腐食電位を持つ材料であればよ
い。Further, although the coating film (4) is shown as a chromium film, any other material may be used as long as it has the same corrosion potential as the protective film (3).
以上のように、この発明によれば磁性膜の少なくとも縁
部と基板との間及び基板の端部を保護膜とはｙ同じ腐食
電位を持つ物質からなる被覆膜で形成したので、空気と
接触する部分がはｙ同じ腐食電位の物質で覆われるため
、異種金属接合腐食が発生しにくいという効果がある。As described above, according to the present invention, a coating film made of a material having the same corrosion potential as the protective film is formed between at least the edge of the magnetic film and the substrate and the edge of the substrate, so that air Since the contacting parts are covered with a substance having the same corrosion potential, there is an effect that corrosion of dissimilar metals is less likely to occur.
第１図はこの発明の一実施例による磁気記録媒体の溝底
を示す断面図、第２図は従来の磁気記録媒体の構成を示
す断面図、第３図は従来の磁気記録媒体の端部を示す詳
細図である。
図において、（１）は基板、（２）は磁性膜、 （２
ａ）は縁部、（３）は保護膜、（４）は被覆膜である。
なお、各図中、同一符号は同一、または相轟部分を示す
。FIG. 1 is a sectional view showing the groove bottom of a magnetic recording medium according to an embodiment of the present invention, FIG. 2 is a sectional view showing the structure of a conventional magnetic recording medium, and FIG. 3 is an end portion of a conventional magnetic recording medium. FIG. In the figure, (1) is the substrate, (2) is the magnetic film, (2
a) is the edge, (3) is the protective film, and (4) is the coating film. In each figure, the same reference numerals indicate the same or similar parts.
Claims (5)
た磁性膜、この磁性膜を覆つて形成された保護膜、上記
磁性膜の少なくとも縁部と上記基板との間及び上記基板
の端部に形成された、上記保護膜とほゞ同等の腐食電位
を持つ物質わらなる被覆膜を備えたことを特徴とする磁
気記録媒体。(1) A metallic substrate, a magnetic film formed leaving an edge of this substrate, a protective film formed covering this magnetic film, a space between at least an edge of the magnetic film and the substrate, and the substrate 1. A magnetic recording medium comprising a coating film made of a material straw having substantially the same corrosion potential as the above-mentioned protective film, formed on an end portion of the magnetic recording medium.
求の範囲第１項記載の磁気記録媒体。(2) The magnetic recording medium according to claim 1, wherein the substrate is made of an aluminum alloy.
る特許請求の範囲第１項又は第２項記載の磁気記録媒体
。(3) The magnetic recording medium according to claim 1 or 2, wherein the magnetic film contains cobalt as a main component.
の範囲第１項〜第３項の何れかに記載の磁気記録媒体。(4) The magnetic recording medium according to any one of claims 1 to 3, wherein the protective film is made of chromium.
徴とする特許請求の範囲第１〜第４項の何れかに記載の
磁気記録媒体。(5) A magnetic recording medium according to any one of claims 1 to 4, characterized in that the coating film is made of chromium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21858886A JPS6371925A (en) | 1986-09-16 | 1986-09-16 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21858886A JPS6371925A (en) | 1986-09-16 | 1986-09-16 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6371925A true JPS6371925A (en) | 1988-04-01 |
Family
ID=16722306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21858886A Pending JPS6371925A (en) | 1986-09-16 | 1986-09-16 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6371925A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006209913A (en) * | 2005-01-31 | 2006-08-10 | Toshiba Corp | Patterned magnetic recording medium, stamper for producing patterned magnetic recording medium, method for manufacturing patterned magnetic recording medium, and magnetic recording / reproducing apparatus |
-
1986
- 1986-09-16 JP JP21858886A patent/JPS6371925A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006209913A (en) * | 2005-01-31 | 2006-08-10 | Toshiba Corp | Patterned magnetic recording medium, stamper for producing patterned magnetic recording medium, method for manufacturing patterned magnetic recording medium, and magnetic recording / reproducing apparatus |
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