JPH04160171A - Rust preventive for bonded magnet powder - Google Patents
Rust preventive for bonded magnet powderInfo
- Publication number
- JPH04160171A JPH04160171A JP28340290A JP28340290A JPH04160171A JP H04160171 A JPH04160171 A JP H04160171A JP 28340290 A JP28340290 A JP 28340290A JP 28340290 A JP28340290 A JP 28340290A JP H04160171 A JPH04160171 A JP H04160171A
- Authority
- JP
- Japan
- Prior art keywords
- magnet powder
- rust preventive
- viscosity
- bonded magnet
- same manner
- 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.)
- Granted
Links
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 230000003449 preventive effect Effects 0.000 title claims abstract description 37
- 239000000843 powder Substances 0.000 title claims description 66
- 239000004698 Polyethylene Substances 0.000 claims abstract description 35
- 229920000573 polyethylene Polymers 0.000 claims abstract description 33
- -1 polypropylene Polymers 0.000 claims abstract description 27
- 239000004743 Polypropylene Substances 0.000 claims abstract description 12
- 229920001155 polypropylene Polymers 0.000 claims abstract description 12
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004793 Polystyrene Substances 0.000 claims abstract description 10
- 229920002223 polystyrene Polymers 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 22
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 17
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 17
- 229920002319 Poly(methyl acrylate) Polymers 0.000 claims description 11
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 8
- 238000011282 treatment Methods 0.000 abstract description 6
- 238000007654 immersion Methods 0.000 abstract description 3
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract description 3
- 229920000058 polyacrylate Polymers 0.000 abstract description 2
- 229920000193 polymethacrylate Polymers 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 23
- 239000000243 solution Substances 0.000 description 19
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000654 additive Substances 0.000 description 12
- 230000000996 additive effect Effects 0.000 description 12
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 12
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000008096 xylene Substances 0.000 description 4
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 3
- 229920000299 Nylon 12 Polymers 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229910000828 alnico Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 2
- 229910000165 zinc phosphate Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910020674 Co—B Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007739 conversion coating Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 239000004584 polyacrylic acid Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
本発明は、ボンド磁石粉末の耐蝕性向上に好適な防錆剤
に関する。The present invention relates to a rust preventive agent suitable for improving the corrosion resistance of bonded magnet powder.
ボンド磁石は、寸法精度が良く複雑な形状の成形や一体
成形が可能であるという特徴から電子機器部品として広
範囲に使用されている。
しかしながら、ボンド磁石粉末として、アルニコ磁石粉
末や希土類磁石粉末を用いるため錆びやすいという欠点
を有する。そのためボンド磁石粉末に対して、リン酸塩
等による化成被膜等の表面処理やＪＩＳＫ２２４６に規
定される防錆油処理等が行われている。Bonded magnets are widely used as electronic device parts because they have good dimensional accuracy and can be molded into complex shapes or integrally molded. However, since Alnico magnet powder or rare earth magnet powder is used as the bonded magnet powder, it has the disadvantage of being susceptible to rust. For this reason, bonded magnet powder is subjected to surface treatments such as chemical conversion coatings using phosphates, etc., and antirust oil treatments specified in JIS K2246.
しかしながら、上記防錆処理法では、磁気特性を損わず
に耐蝕性を満足させることは極めて困誼であった。そこ
で本発明の目的は、上記事情に鑑み、磁気特性を損なわ
ずに耐蝕性の優れたボンド磁石粉末を製造することが出
来る防錆剤を提供することにある。However, with the above rust prevention treatment method, it is extremely difficult to satisfy corrosion resistance without impairing magnetic properties. SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a rust preventive agent that can produce bonded magnet powder with excellent corrosion resistance without impairing magnetic properties.
本発明は、上記目的を達成するものであって、０．５〜
５．０体積％のメタン系スルホン酸塩を含有するポリエ
チレン、ポリプロピレン、ポリスチレン、ポリアクリル
酸メチルおよびポリメタクリル酸メチルのうち少なくと
も１種以上を含有する溶液からなり、その溶液の２０℃
における粘度が１０００センチポイズ以下であることを
特徴とするボンド磁石粉末用防錆剤である。The present invention achieves the above object, and has a
Consists of a solution containing at least one of polyethylene, polypropylene, polystyrene, polymethyl acrylate, and polymethyl methacrylate containing 5.0% by volume of methane sulfonate, and the solution is heated at 20°C.
A rust preventive agent for bonded magnet powder characterized by having a viscosity of 1000 centipoise or less.
本発明のボンド磁石粉末用防錆剤に防錆主剤として含ま
れるポリエチレン、ポリプロピレン、ポリスチレン、ポ
リアクリル酸メタルおよびポリメタクリル酸メチルは汎
用樹脂で安価である。また、主鎖がアルキル基からなり
疎水性を有していることから、ボンド磁石粉末表面に発
錆源であるハロゲン含有水分が付着するのを防止する効
果が大きいことが特筆される。これ以外の汎用樹脂、例
えばポリアミド樹脂やエポキシ樹脂は、基本構造に占め
る親木基の割合か大きく碗水性に劣る。よって耐蝕性が
充分でない。
次に、ボンド磁石粉末用防錆剤の添加剤であるメタン系
スルホン酸塩、例えば、Ｃ−Ｈ＊ Ｓ ＯｓＮ ａ 、
Ｃｓ Ｈ１，Ｓ Ｏ３Ｎ ａ、あるいは（Ｃ７Ｈ１５
ＳＯ３）２ Ｃａは、防錆成形原料の磁石と上記樹脂の
密着性を向上させる役割をもっている。しかし、その添
加量か゛０，５体槓％以下であると、樹脂とボンド磁石
粉末とのぬれ性か悪く、形成される被膜か峨密性に欠け
てしまう、逆に、５体積％以上では、被膜か厚くなり、
磁気特性か劣化する。
また、本発明の防錆剤は、２０℃における粘度か１００
０センチポイズ以下であることか必要である。これによ
り、磁気特性を低下させずに、耐蝕性に優れた、すなわ
ち安定で薄い防錆被膜を形成することかできる。粘度１
０００センチポイズを超えると、形成される防錆被膜の
厚さが増大して耐蝕性や磁気特性が低下する。
防錆剤の２０℃における粘度を１０００センチボイス以
下に調整するには、溶剤としてベンゼン系有機溶媒、例
えばベンゼン、キシレン、トルエン等を適宜使用すれば
良い。
本発明の防錆剤によりボンド磁石粉末に防錆処理を施す
には種種の方法が用いられるが、より安価な浸漬法が一
般的である。The polyethylene, polypropylene, polystyrene, metal polyacrylate, and polymethyl methacrylate contained as main rust preventive agents in the rust preventive agent for bonded magnet powder of the present invention are general-purpose resins and are inexpensive. Furthermore, since the main chain is composed of an alkyl group and has hydrophobicity, it is noteworthy that it is highly effective in preventing halogen-containing water, which is a source of rust, from adhering to the surface of the bonded magnet powder. Other general-purpose resins, such as polyamide resins and epoxy resins, have a large proportion of parent wood groups in their basic structure and are inferior in potability. Therefore, corrosion resistance is not sufficient. Next, a methane-based sulfonate, which is an additive for a rust preventive agent for bonded magnet powder, such as C-H*S OsNa,
Cs H1, S O3N a, or (C7H15
SO3)2Ca has the role of improving the adhesion between the magnet of the anticorrosive molding raw material and the resin. However, if the amount added is less than 0.5% by volume, the wettability between the resin and bonded magnet powder will be poor, and the formed film will lack density. , the coating becomes thicker,
Magnetic properties deteriorate. Furthermore, the rust preventive of the present invention has a viscosity of 100°C at 20°C.
It is necessary that it be 0 centipoise or less. Thereby, it is possible to form a stable and thin anti-corrosion coating with excellent corrosion resistance without deteriorating the magnetic properties. Viscosity 1
If it exceeds 0,000 centipoise, the thickness of the rust-preventive coating formed will increase and the corrosion resistance and magnetic properties will deteriorate. In order to adjust the viscosity of the rust preventive at 20° C. to 1000 centivoice or less, a benzene-based organic solvent such as benzene, xylene, toluene, etc. may be appropriately used as a solvent. Various methods can be used to apply rust prevention treatment to bonded magnet powder using the rust preventive agent of the present invention, but the cheaper immersion method is generally used.
以下に、本発明を実施例により説明する。
ボンド磁石用合金粉末は、以下に記述する方法で作成し
た。Ｎｄ−Ｆｅ−Ｃｏ−Ｂ系合金の鋳塊を高周波溶解後
、周速度４０ｍ／秒で回転する銅ロール面に圧力０．５
ｋｇ／ｃｍ”で吹き付けて急冷し、幅２ ｍ ｍ、厚さ
２０μｍのリボンを得た。
このリボンを真空中７５０℃で１０分間加熱し、常温ま
で冷却した後、３５メツシユ（ＪＩＳ）以下まで粉砕し
た粉末（以下、磁石粉木工と略す）を得た。
磁石粉木工の組成は原子％で、Ｎｄ１２．５％、Ｃｏ５
．５％、Ｂ５．０％、残部Ｆｅであった。
一方、ＪＩＳ Ｃ２５０２に規定された永久磁石材料
として、Ｃｏ ２４重量％、Ｎｉ １４重量％、Ａ９８
′！ｊＬ量％、Ｃｕ３重量％、残部Ｆｅの組成を有し、
ＭＣＡ ４４１５ の仕様を満足させるアルニコ磁
石を用意した後、このアルニコ磁石を粉砕して、篩分け
する事にて、粒径が３５メツシユ以下の磁石粉末（以下
、磁石粉末２と称す）を得た。
天ｌ目１１
ポリエチレン（ＰＥ）のペレット状物を適量の８０℃キ
シレンに溶解した。但し、２０℃における粘度が１００
０センチポイズ以下、すなわち本実施例の場合８２０セ
ンチポイズになるように調整した。これにメタン系スル
ホン酸塩としてｃ４Ｈｅ ＳＯ３Ｎａを適量、すなわち
本実ａ例の場合１．０体積％添加し、混合した８０”Ｃ
の溶液中に、上記磁石粉末ｌを３０分間浸漬し、その後
磁石粉末ｌをろ別し、８０℃の真空オーブン中にて１時
間乾燥した。
ここで得た防錆処理済み磁石粉木工の１００ｇに対しエ
ポキシ樹脂および硬化剤からなるバインダー２ｇを混合
し、面圧力５ ｔ ／ ｃ ｍ ’で圧縮成形し、１２
０℃で１時間加熱することにより、幅５ｍｍ、長さｌ
Ｏｍｍ、高さ６ｍｍの硬化物を得た。この硬化物を５０
ｋＯｅの磁場中で着磁してボンド磁石とした（ボンド磁
石１と称す）。
なお、粘度測定には較正？ｌ！ （Ｊ Ｉ ５Ｚ８８０
９ ）で較正したＢ型回転粘度計を用いた。
ここで得られた防錆処理済み磁石粉末１及びボンド磁石
に対して以下の試験を行った。
（１）耐蝕性試験：常温、濃度１重量％の塩化ナトリウ
ム水溶液に１０分間浸漬し、ろ別温度度８０℃相対湿度
９０％の恒温恒湿槽中で２００時間暴露し、試験試料の
発錆状態を目視確認した。
（２）磁気特性二ボンド磁石１をチオフィー型自記磁束
計にて最大エネルギー積を測定した。
以上の結果を防錆添加剤含有量及び防錆剤粘度と共に第
１表に示す。
Ｋ１■ユ
メタン系スルホン酸塩として、Ｃ，Ｈ，ＳＯ。
Ｎａを３．０体積％添加した他は、実施例１と同機にし
て、磁石粉末１を処理した。但し、溶液の２０℃におけ
る粘度が５０２センチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｋ臣皿旦
メタン系スルホン酸塩として、Ｃ４Ｈ−Ｓ ＯｓＮａを
５．０体積％添加した他は、実施例１と同様にして、磁
石粉末１を処理した。但し、溶液の２０℃における粘度
か３１５センチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
え良■１
ポリエチレン（ＰＥ）の代わりにポリスチレン（ＰＳ）
を使用し、メタン系スルボン酸塩として、Ｃ４Ｈ＊ Ｓ
Ｏｓ Ｎ ａを２．０体積％添加した他は、実施例１
と同様にして、磁石粉末１を処理しな。
但し、溶液の２０’Ｃにおける粘度か３１５センチボイ
スであった。
ここで得な防錆処理済み磁石粉末１がら実施例１と同様
にして、ボンド磁石１を得て、試験しな。
Ｋ良１
ポリエチレン（ＰＥ）の代わりにポリスチレン（ＰＳ）
を使用し、メタン系スルボン酸塩として、Ｃ４Ｈｅ Ｓ
Ｏ３Ｎａを４．０体積％添加した他は、実施例１と同機
にして、磁石粉末１を処理しな。
但し、溶液の２０”Ｃにおける粘度が６７５センチボイ
スであった。
ここで得た防錆処理済み磁石粉末１がら実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｋ臣■玉
ポリエチレン（ＰＥ）の代わりにポリプロピレン（ＰＰ
）を使用し、メタン系スルボン酸塩としてＣ４Ｈｅ Ｓ
Ｏ３Ｎａを１．０体積％添加した他は、実施例１と同様
にして、磁石粉末１を処理した。但し、溶液の２０℃に
おける粘度か３００センチボイスであった。
ここで得た防錆処理済み磁石粉末１がら実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｋ臣■ユ
ポリエチレン（ＰＥ）の代わりにポリアクリル敢メチル
（ＰＭＡＡ）を使用し、メタン系スルボン酸塩としてＣ
４Ｈｅ ｓｏ、Ｎａをｉ、ｏ体積％添加した他は、実施
例１と同様にして、磁石粉末１を処理した。但し、溶液
の２０”Ｃにおける粘度が３００センチボイスであった
。
ここで得た防錆処理済み磁石粉末１がら実施例１と同様
にして、ボンド磁石１を得て、試験した。
ｉ臣上上
ポリエチレン（ＰＥ）の代わりにポリメタクリル酸メチ
ル（ＰＭＭＡ）を使用し、メタン系スルホン酸塩として
、Ｃ４Ｈ９ＳＯ３Ｎａを２．０体積％添加した他は、実
施例１と同様にして、磁石粉末１を処理した。但し、溶
液の２０℃における粘度が２８０センチボイスであった
。
ここで得た防錆処理済み磁石粉末１から実施例１と同機
にして、ボンド磁石１を得て、試験した。
衷亙■ユ
ポリエチレン（ＰＥ）の代わりにポリメタクリル酸メチ
ル（ＰＭＭＡ）を使用し、メタン系スルホン酸塩として
Ｃ４Ｈｅ ＳＯ３Ｎａを４．０体積％添加した他は、実
施例１と同様にして、磁石粉末１を処理しな、但し、溶
液の２０℃における粘度が７２０センチボイスであった
。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石ｌを得て、試験した。
Ｌ飲■ユ
メタン系スルホン酸塩として、Ｃ４ＨＩ ＳＯ３Ｎａを
０．２体積％添加した他は、実施例１と同様にして、磁
石粉末１を処理しな、なお、溶液の２０℃における粘度
は８２０センチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験しな。
Ｌ敗旦ユ
メタン系スルホン酸塩として、Ｃ４Ｈｅ Ｓ ０３Ｎａ
を７゜５体積％添加した他は、実施例１と同様にして、
磁石粉末１を処理した。なお、溶液の２０℃における粘
度は５０５センチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
ル鮫旦ユ
メタン系スルホン酸塩として、Ｃ４Ｈ，Ｓｏ。
Ｎａを２．０体積％添加した他は、実施例１と同様にし
て、磁石粉末１を処理した。但し、溶液の２０℃におけ
る粘度か１５００センチポイズであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
止ｌ自ｉま
ポリエチレン（ＰＲ）の代わりにポリエチレン（ＰＥ）
を使用し、メタン系スルホン酸塩として、Ｃ４Ｈｅ Ｓ
Ｏｓ Ｎａを２．０体積％添加した他は、実施例１と同
様にして、磁石粉末１を処理した。
但し、溶液の２０℃における粘度が１５００センチポイ
ズであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｌ置皿５
ポリエチレン（ＰＥ）の代わりにポリメタクリル酸メチ
ル（ＰＭＭＡ）を使用し、メタン系スルホン酸塩として
、Ｃ４Ｈｅ ＳＯｓ Ｎａを７．５体積％添加した他は
、実施例１と同様にして、磁石粉末１を処理した。なお
、溶液の２０℃における粘度が７２０センチポイズであ
った。
ここで得た防錆処理済み磁石粉末ｌから実施例１と同様
にして、ボンド磁石１を得て、試験した。
匿致且互
防錆剤としてナイロン１２を使用した他は、実施例１と
同様にして、磁石粉末１を処理した。なお、ナイロン１
２の２０℃における粘度が４１０センチポイズであった
。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｌ毀ヱユ
防錆剤としてノボラック型−液性エポキシ樹脂を使用し
た他は、実施例１と同様にして、磁石粉末１を処理した
。なお、エポキシ樹脂の２０℃における粘度か４１０セ
ンチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
Ｌ秋伍溢
ポリエチレン（ＰＥ）の代わりにエポキシを使用し、メ
タン系スルホン酸塩として、Ｃ４Ｈ，５ＯｉＮａを２．
０体積％添加した他は、実施例１と同様にして、磁石粉
末１を処理した。なお、溶液の２０℃における粘度が４
１０センチボイスであった。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ポンド磁石１を得て、試験した。
従漣口１１
磁石粉末１に対して、６０℃、ｐＨ３，５のリン酸亜鉛
水溶液中に１５分間浸漬、ろ別し、８０℃の真空オーブ
ン中で乾燥する処理を行なったこと以外は、実施例１と
同様にして、磁石粉末１を処理した。なお、リン酸亜鉛
水溶液の２０℃における粘度が１５５センチボイスであ
った。
ここで得た防錆処理済み磁石粉末１から実施例１と同様
にして、ボンド磁石１を得て、試験した。
１嵐±１
防錆処理剤として、常温の防錆剤（ＪＩＳ Ｋ２２４
６に規定されている溶剤希釈形さび止め油３種）を使用
した他は、実施例１と同様にして、磁石粉末１を処理し
た。なお、防錆剤の２０℃における粘度か３８２センチ
ボイスであった。
ここで得な防錆処理済み磁石粉末１から実施例１と同機
にして、ポンド磁石１を得て、試験した。
実施例１〜９、比較例１〜８、従来例１〜２の試験結果
を防錆主剤、添加剤含有量及び防錆剤粘度と共に第１表
に示す、実施例１〜９、比較例１〜８、従来例１〜２を
比較すれば、本発明の防錆剤か極めて優れた耐蝕性を有
していることがわかる。
火菫應口」ヒニ１至
実施例１〜９と同様にして、ポリエチレン（ＰＥ）、ポ
リプロピレン（ＰＰ） 、ポリスチレン（ＰＳ）、ポリ
アクリル酸メチル（ＰＭＡＡ）あるいはポリメタクリル
酸メチル（ＰＭＭＡ）をキシレンに溶解し、２０℃にお
ける粘度が１０００センチポイズ以下になるように調整
し、これに添加剤のメタン系スルホン酸塩として、Ｃ９
Ｈ，、ＳＯ，Ｎａを適量添加し、混合した溶液を使って
、磁石粉末１を処理及び試験した。
Ｌ鞍匠エユエ上
比較例１〜８と同様にして、ポリエチレン（ＰＥ）、ポ
リスチレン（ＰＳ）、ポリアクリル酸メチル（ＰＭＡＡ
）、ポリメタクリル酸メチル（ＰＭＭＡ）、ナイロン１
２あるいはエポキシ樹脂を使って、磁石粉末１を処理及
び試験した。添加剤のメタン系スルホン酸塩として、Ｃ
ｓ Ｈ，、Ｓｏ。
Ｎａを適量（零を含む、）添加した。
実施例１０〜１５および比較例９〜１５の試験結果を防
錆主剤、添加剤含有量及び防錆剤粘度と共に第２表に示
す、実施例１０〜１５と比較例９〜１５を比較すれば、
本発明の防錆剤が極めて優れた耐蝕性を有していること
がわかる。
１１匠上立二ｌユ
実施例１〜９と同様にして、ポリエチレン（ＰＥｌポリ
プロピレン（ＰＰ）、ポリスチレン（ＰＳ）、ポリアク
リル酸メチル（ＰＭＡＡ）あるいはポリメタ−クリル酸
メチル（ＰＭＭＡ）をキシレンに溶解し、２０℃におけ
る粘度が１０００センチボイス以下になるように調整し
、これに添加剤のメタン系スルホン酸塩として（Ｃ７Ｈ
，，５Ｏ３）ｚＣａを適量添加し、混合した溶液を使っ
て、磁石粉末１を処理及び試験した。
止１１ＬＬＬユ」」。
比較例１〜８と同機にして、ポリプロピレン（ＰＰ）、
ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリア
クリル酸メチル（ＰＭＡＡ）、ポリメタクリル酸メチル
（ＰＭＭＡ）、ナイロン１２及びエポキシのいずれかを
使って、磁石粉末１を処理及び試験した。添加剤のメタ
ン系スルボン６塩として（Ｃ７Ｈ１！１ＳＯ３）２ Ｃ
ａを適量（零を含む、）添加した。
実施例１６〜２２および比較例１６〜２１の試験結果を
防錆主剤、添加剤含有量及び＃５錆剤粘度と共に第３表
に示す、実施例１６〜２２と比較例１６〜２１を比較す
れば、本発明の防錆剤が極めて優れた耐蝕性を有してい
ることかわがる。
Ｋ１匠１ユニユニ
磁石粉末２を使って、実施例１と同機に防錆処理し、防
錆処理済み磁石粉末２の１０ｏｔに対して、バインター
としてナイロン１２を７．５ｇの割合で混合した後、こ
の混合物を２５０ ’Ｃで１５分間混合し、１８ｋＯｅ
の磁場中で２４０’Ｃにて射出成型し、幅５噛、長さ１
０Ｉｌｆｌ、高さ５１１１ｍｌ＋の成型体を製作し、５
０ｋＯｅの磁場中で着磁して、ボンド磁石とした（以下
、ボンド磁石２と称す）。
ボンド磁石２を使用して、実施例１〜つと同様に試験し
た。
て試験した。
良え五旦ニュ
ボンド磁石２を使用して、従来例１〜２と同様に試験し
た。
実Ｉ！１例２３〜２９、比較例２２〜２８および従来例
３〜４の試験結果を防錆主剤、添加側含有ｉ及び防錆剤
粘度と共に第４表に示す、実施例２３〜２９と比較例２
２〜２８を比較すれば、本発明の防錆剤か極めて優れた
耐蝕性を有していることかわかる。
例３０〜３３
ボンド磁石２を使用して、実施例１０〜１５と同様に試
験した。
上 中受 例 ２９〜３ ２
ボンド磁石２を使用して、比較例９〜１５と同機に試験
した。
実施例３０〜３３および比較例２９〜３２の試験結果を
防錆主剤、添加剤含有量及び防錆剤粘度と共に第５表に
示す、実施例３０〜３３と比較例２９〜３２を比較すれ
ば、本発明の防錆剤か極めて優れた耐蝕性を有している
ことがわかる。
Ｋ１匠１豆ニ上上
ボンド磁石２を使用して、実施例１６〜２２と同様に試
験した。
反肱匠ユユニ旦ユ
ボンド磁石２を使用して、比較例１６〜２１と同様に試
験した。
実施例３４〜３８および比較例３３〜３７の試験結果を
防錆主剤、添加剤含有量及び防錆剤粘度と共に第６表に
示す、実施例３４〜３８と比較例３３〜３７を比較すれ
は、本発明の防錆剤が極めて優れた耐蝕性を有している
ことかわかる、以上の実施例に示すように、本発明の実
施により入手された製品は、優れた耐蝕性を示すと共に
、磁気特性としての最大エネルギー積は従来より高い数
値を示しており、その他の磁気特性に対しても何等の劣
化現象を認められなかった。
（この頁以下余白）The present invention will be explained below using examples. The alloy powder for bonded magnets was created by the method described below. After high-frequency melting of a Nd-Fe-Co-B alloy ingot, a pressure of 0.5 is applied to the surface of a copper roll rotating at a circumferential speed of 40 m/s.
kg/cm'' and quenched to obtain a ribbon with a width of 2 mm and a thickness of 20 μm. This ribbon was heated in a vacuum at 750°C for 10 minutes, cooled to room temperature, and then heated to 35 mesh (JIS) or less. A pulverized powder (hereinafter abbreviated as magnet powder woodworking) was obtained. The composition of magnet powder woodworking is in atomic %, Nd 12.5%, Co5
．． 5%, B 5.0%, and the balance Fe. On the other hand, permanent magnet materials specified in JIS C2502 include 24% by weight of Co, 14% by weight of Ni, and A98.
′! jL amount%, Cu3wt%, balance Fe,
After preparing an alnico magnet that satisfies the specifications of MCA 4415, this alnico magnet was crushed and sieved to obtain a magnet powder with a particle size of 35 mesh or less (hereinafter referred to as magnet powder 2). . Top 11 Polyethylene (PE) pellets were dissolved in an appropriate amount of 80°C xylene. However, the viscosity at 20°C is 100
It was adjusted to be 0 centipoise or less, that is, 820 centipoise in the case of this example. To this, an appropriate amount of c4He SO3Na as a methane-based sulfonate was added, that is, 1.0% by volume in the case of this Example A, and the mixed 80"C
The magnet powder 1 was immersed in the solution for 30 minutes, and then the magnet powder 1 was filtered off and dried in a vacuum oven at 80° C. for 1 hour. 2 g of a binder consisting of an epoxy resin and a curing agent was mixed with 100 g of the rust-preventing treated magnetic powder woodwork obtained here, and compression molded at a surface pressure of 5 t/cm'.
By heating at 0℃ for 1 hour, it becomes 5mm wide and 1mm long.
A cured product with a thickness of 0 mm and a height of 6 mm was obtained. 50% of this cured product
It was magnetized in a magnetic field of kOe to form a bonded magnet (referred to as bonded magnet 1). Also, is there any calibration required for viscosity measurement? l! (J I 5Z880
A B-type rotational viscometer calibrated according to 9) was used. The following tests were conducted on the antirust-treated magnet powder 1 and the bonded magnets obtained here. (1) Corrosion resistance test: The test sample was immersed in a sodium chloride aqueous solution with a concentration of 1% by weight at room temperature for 10 minutes, filtered, and exposed for 200 hours in a constant temperature and humidity chamber at a temperature of 80°C and a relative humidity of 90%. The condition was visually confirmed. (2) Magnetic properties The maximum energy product of the two-bond magnet 1 was measured using a Thioffee-type self-recording flux meter. The above results are shown in Table 1 along with the rust preventive additive content and rust preventive viscosity. K1■ Yumethane sulfonate: C, H, SO. Magnet powder 1 was processed using the same machine as in Example 1, except that 3.0% by volume of Na was added. However, the viscosity of the solution at 20° C. was 502 centibois. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Magnet powder 1 was treated in the same manner as in Example 1, except that 5.0% by volume of C4H-S OsNa was added as the methane-based sulfonate. However, the viscosity of the solution at 20° C. was 315 cmVoice. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Era■1 Polystyrene (PS) instead of polyethylene (PE)
using C4H*S as a methane-based sulfonate.
Example 1 except that 2.0% by volume of Os Na was added.
Treat magnet powder 1 in the same manner as above. However, the viscosity of the solution at 20'C was 315 cmVoice. Here, a bonded magnet 1 was obtained in the same manner as in Example 1 from the rust-preventing treated magnet powder 1 and tested. Kyo1 Polystyrene (PS) instead of polyethylene (PE)
and as a methane-based sulfonate, C4HeS
The same machine as Example 1 was used except that 4.0% by volume of O3Na was added, and the magnet powder 1 was not processed. However, the viscosity of the solution at 20"C was 675 centimeters. Bonded magnet 1 was obtained in the same manner as in Example 1 from the anti-rust magnet powder 1 obtained here, and tested. Polypropylene (PP) instead of polyethylene (PE)
) and C4HeS as the methane-based sulfonate.
Magnet powder 1 was treated in the same manner as in Example 1, except that 1.0% by volume of O3Na was added. However, the viscosity of the solution at 20° C. was 300 cmVoice. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Komi ■Using polyacrylic acid methyl (PMAA) instead of polyethylene (PE), C as a methane-based sulfonate.
Magnet powder 1 was treated in the same manner as in Example 1, except that 4He so, Na was added in an amount of i, o volume %. However, the viscosity of the solution at 20"C was 300 centimeters. Bonded magnet 1 was obtained and tested in the same manner as in Example 1 from the anti-rust magnet powder 1 obtained here. Magnet powder 1 was prepared in the same manner as in Example 1, except that polymethyl methacrylate (PMMA) was used instead of the upper polyethylene (PE) and 2.0% by volume of C4H9SO3Na was added as the methane-based sulfonate. However, the viscosity of the solution at 20° C. was 280 centibois. Bonded magnet 1 was obtained from the rust-preventing treated magnet powder 1 obtained here using the same machine as in Example 1, and tested. Magnet powder was prepared in the same manner as in Example 1, except that polymethyl methacrylate (PMMA) was used instead of polyethylene (PE) and 4.0% by volume of C4HeSO3Na was added as the methane-based sulfonate. However, the viscosity of the solution at 20° C. was 720 centibois. Bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Magnet powder 1 was treated in the same manner as in Example 1, except that 0.2% by volume of C4HISO3Na was added as a methane-based sulfonate.The viscosity of the solution at 20°C was The bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. 03Na
Same as Example 1 except that 7.5% by volume of was added.
Magnet powder 1 was processed. The viscosity of the solution at 20° C. was 505 centivoices. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. C4H,So as a methane-based sulfonate. Magnet powder 1 was treated in the same manner as in Example 1, except that 2.0% by volume of Na was added. However, the viscosity of the solution at 20°C was 1500 centipoise. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Polyethylene (PE) instead of polyethylene (PR)
and as a methane sulfonate, C4HeS
Magnet powder 1 was treated in the same manner as in Example 1, except that 2.0% by volume of Os Na was added. However, the viscosity of the solution at 20°C was 1500 centipoise. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. L plate 5 Same as Example 1 except that polymethyl methacrylate (PMMA) was used instead of polyethylene (PE) and 7.5% by volume of C4He SOs Na was added as the methane sulfonate. , magnet powder 1 was processed. The viscosity of the solution at 20° C. was 720 centipoise. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Magnet powder 1 was treated in the same manner as in Example 1, except that nylon 12 was used as a concealing and mutually rust-preventing agent. In addition, nylon 1
The viscosity of No. 2 at 20° C. was 410 centipoise. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Magnet powder 1 was treated in the same manner as in Example 1, except that a novolak-type liquid epoxy resin was used as the rust preventive agent. The viscosity of the epoxy resin at 20° C. was 410 cmVoice. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Epoxy was used instead of polyethylene (PE), and C4H,5OiNa was added as a methane sulfonate.
Magnet powder 1 was treated in the same manner as in Example 1, except that 0% by volume was added. Note that the viscosity of the solution at 20°C is 4
It was a 10cm voice. A pound magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. Shurenguchi 11 Magnet powder 1 was immersed in a zinc phosphate aqueous solution at 60°C and pH 3.5 for 15 minutes, filtered, and dried in a vacuum oven at 80°C. Magnet powder 1 was treated in the same manner as in Example 1. Note that the viscosity of the aqueous zinc phosphate solution at 20° C. was 155 centivoices. A bonded magnet 1 was obtained from the anticorrosion-treated magnet powder 1 obtained here in the same manner as in Example 1, and tested. 1 storm ±1 As a rust preventive treatment agent, use a normal temperature rust preventive agent (JIS K224
Magnet powder 1 was treated in the same manner as in Example 1, except that three kinds of solvent-diluted rust preventive oils specified in Section 6) were used. The viscosity of the rust preventive agent at 20°C was 382 centimeters. Here, a pound magnet 1 was obtained using the same machine as in Example 1 from the rust-preventing treated magnet powder 1, and was tested. The test results of Examples 1 to 9, Comparative Examples 1 to 8, and Conventional Examples 1 to 2 are shown in Table 1 along with the rust preventive main agent, additive content, and rust preventive viscosity. Examples 1 to 9, Comparative Example 1 ~8. Comparing Conventional Examples 1 and 2, it can be seen that the rust preventive of the present invention has extremely excellent corrosion resistance. In the same manner as in Examples 1 to 9, polyethylene (PE), polypropylene (PP), polystyrene (PS), polymethyl acrylate (PMAA) or polymethyl methacrylate (PMMA) was mixed with xylene. The viscosity at 20°C was adjusted to 1000 centipoise or less, and C9 was added as an additive methane sulfonate.
Magnet powder 1 was processed and tested using a solution in which appropriate amounts of H, SO, and Na were added and mixed. L Kurasho Eyue In the same manner as in Comparative Examples 1 to 8, polyethylene (PE), polystyrene (PS), polymethyl acrylate (PMAA)
), polymethyl methacrylate (PMMA), nylon 1
Magnet powder 1 was processed and tested using 2 or epoxy resin. As an additive methane sulfonate, C
s H,, So. Appropriate amounts (including zero) of Na were added. The test results of Examples 10 to 15 and Comparative Examples 9 to 15 are shown in Table 2 along with the rust preventive main agent, additive content, and rust preventive viscosity. Comparing Examples 10 to 15 and Comparative Examples 9 to 15, ,
It can be seen that the rust preventive of the present invention has extremely excellent corrosion resistance. 11 In the same manner as in Examples 1 to 9, polyethylene (PE, polypropylene (PP), polystyrene (PS), polymethyl acrylate (PMAA) or polymethyl methacrylate (PMMA) was dissolved in xylene. The viscosity at 20°C was adjusted to below 1000 centivoices, and added as an additive, methane sulfonate (C7H).
,,5O3)zCa was added in an appropriate amount and a mixed solution was used to process and test magnet powder 1. Stop 11 LLL Yu.” Using the same machine as Comparative Examples 1 to 8, polypropylene (PP),
Magnet powder 1 was processed and tested using either polyethylene (PE), polystyrene (PS), polymethyl acrylate (PMAA), polymethyl methacrylate (PMMA), nylon 12, and epoxy. As an additive methane sulfone 6 salt (C7H1!1SO3)2C
An appropriate amount (including zero) of a was added. The test results of Examples 16 to 22 and Comparative Examples 16 to 21 are shown in Table 3 together with the rust preventive main agent, additive content and #5 rust agent viscosity. For example, it can be seen that the rust preventive of the present invention has extremely excellent corrosion resistance. Using K1 Takumi Uni Uni magnet powder 2, the same machine as in Example 1 was subjected to rust prevention treatment, and 7.5 g of nylon 12 was mixed as a binder to 10 ot of rust prevention treated magnet powder 2. This mixture was mixed for 15 minutes at 250'C and 18kOe
Injection molded at 240'C in a magnetic field, width 5 mm, length 1
0Ilfl, a molded body with a height of 5111ml+ was produced, and 5
It was magnetized in a magnetic field of 0 kOe to form a bonded magnet (hereinafter referred to as bonded magnet 2). Tests were conducted in the same manner as in Examples 1 to 2 using Bonded Magnet 2. It was tested. Tests were conducted in the same manner as in Conventional Examples 1 and 2 using the New Bond Magnet 2. Real I! The test results of Examples 23 to 29, Comparative Examples 22 to 28, and Conventional Examples 3 to 4 are shown in Table 4 along with the rust preventive main agent, additive side content i, and rust preventive viscosity. Examples 23 to 29 and Comparative Example 2
Comparing No. 2 to No. 28, it can be seen that the rust preventive of the present invention has extremely excellent corrosion resistance. Examples 30-33 Bonded magnet 2 was used and tested in the same manner as Examples 10-15. Upper Middle Receiver Examples 29-3 2 Using bonded magnet 2, the same machine as Comparative Examples 9-15 was tested. The test results of Examples 30 to 33 and Comparative Examples 29 to 32 are shown in Table 5 along with the rust preventive main agent, additive content, and rust preventive viscosity. Comparing Examples 30 to 33 and Comparative Examples 29 to 32, It can be seen that the rust preventive of the present invention has extremely excellent corrosion resistance. Tests were conducted in the same manner as in Examples 16 to 22 using K1 Takumi Mamenijo Bonded Magnet 2. Tests were conducted in the same manner as in Comparative Examples 16 to 21 using the Anti-Sho Yuuni Dan Yubond Magnet 2. The test results of Examples 34 to 38 and Comparative Examples 33 to 37 are shown in Table 6 along with the rust preventive main agent, additive content and rust preventive viscosity. It can be seen that the rust inhibitor of the present invention has extremely excellent corrosion resistance.As shown in the above examples, the products obtained by implementing the present invention exhibit excellent corrosion resistance, and The maximum energy product as a magnetic property was higher than conventional values, and no deterioration phenomenon was observed in other magnetic properties. (Margins below this page)
以上から明らがなように、本発明は浸漬法という安価な
方法で耐蝕性に優れ、しかも磁気特性も満足するボンド
磁石を製造するのに好適な防錆剤を提供することができ
る。As is clear from the above, the present invention can provide a rust preventive agent suitable for producing bonded magnets that have excellent corrosion resistance and also have satisfactory magnetic properties using the immersion method, which is an inexpensive method.
Claims (1)
するポリエチレン、ポリプロピレン、ポリスチレン、ポ
リアクリル酸メチルおよびポリメタクリル酸メチルのう
ち少なくとも１種以上を含有する溶液からなり、該溶液
の２０℃における粘度が１０００センチポイズ以下であ
ることを特徴とするボンド磁石粉末用防錆剤。Consisting of a solution containing at least one of polyethylene, polypropylene, polystyrene, polymethyl acrylate, and polymethyl methacrylate containing 0.5 to 5.0 volume % of methane sulfonate; A rust preventive agent for bonded magnet powder, characterized in that the viscosity at °C is 1000 centipoise or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2283402A JP3050325B2 (en) | 1990-10-23 | 1990-10-23 | Rust inhibitor for bonded magnet powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2283402A JP3050325B2 (en) | 1990-10-23 | 1990-10-23 | Rust inhibitor for bonded magnet powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04160171A true JPH04160171A (en) | 1992-06-03 |
| JP3050325B2 JP3050325B2 (en) | 2000-06-12 |
Family
ID=17665062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2283402A Expired - Lifetime JP3050325B2 (en) | 1990-10-23 | 1990-10-23 | Rust inhibitor for bonded magnet powder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3050325B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114999807A (en) * | 2022-06-29 | 2022-09-02 | 矿冶科技集团有限公司 | Preservative for flexible neodymium-iron-boron magnet and method for surface preservative treatment of flexible neodymium-iron-boron magnet |
-
1990
- 1990-10-23 JP JP2283402A patent/JP3050325B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114999807A (en) * | 2022-06-29 | 2022-09-02 | 矿冶科技集团有限公司 | Preservative for flexible neodymium-iron-boron magnet and method for surface preservative treatment of flexible neodymium-iron-boron magnet |
| CN114999807B (en) * | 2022-06-29 | 2023-12-01 | 矿冶科技集团有限公司 | Preservative for flexible neodymium-iron-boron magnet and method for surface preservative treatment of flexible neodymium-iron-boron magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3050325B2 (en) | 2000-06-12 |
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