JPH01245880A - Method for coating rare-earth element magnet - Google Patents
Method for coating rare-earth element magnetInfo
- Publication number
- JPH01245880A JPH01245880A JP7561688A JP7561688A JPH01245880A JP H01245880 A JPH01245880 A JP H01245880A JP 7561688 A JP7561688 A JP 7561688A JP 7561688 A JP7561688 A JP 7561688A JP H01245880 A JPH01245880 A JP H01245880A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- coating
- film
- thickness
- aqueous solution
- 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
- 238000000576 coating method Methods 0.000 title claims description 33
- 239000011248 coating agent Substances 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 8
- 229910052761 rare earth metal Inorganic materials 0.000 title claims description 7
- 238000004070 electrodeposition Methods 0.000 claims abstract description 21
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 7
- 239000003973 paint Substances 0.000 abstract description 7
- 239000003822 epoxy resin Substances 0.000 abstract description 5
- 229920000647 polyepoxide Polymers 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000010422 painting Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910021333 Na2Si Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229910001347 Stellite Inorganic materials 0.000 description 1
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000012756 surface treatment agent Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 239000004846 water-soluble epoxy resin Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、希土類磁石の耐食性を高める目的で行なうコ
ーティングの改良に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in coatings for the purpose of increasing the corrosion resistance of rare earth magnets.
（従来の技術］
希土類を利用した永久磁石は、その高い磁気特性を評価
されて、広い産業分野に採用されている。(Prior Art) Permanent magnets using rare earth elements have been evaluated for their high magnetic properties and have been adopted in a wide range of industrial fields.
とくに、Ｎｄ −Ｆｅ −Ｂ系に代表される磁石は、そ
れまで中心であった３ｍ−Ｃｏ系にくらべて、原料が入
手しやすくて低価格であり、しかも磁気特性はいっそう
すぐれているため、急速に普及しつつある。In particular, magnets represented by the Nd-Fe-B system are easier to obtain raw materials, are less expensive, and have even better magnetic properties than the 3m-Co system, which was the mainstay until then. It is rapidly becoming popular.
ところが、Ｒ−Ｆｅ−Ｂ系１１石には、耐熱性と耐食性
が低いという難点がある。 前者は合金組成の選択によ
り一応解決できるが、後者は防食手段をとることで対応
するしかない。However, R-Fe-B-based 11 stones have a drawback that they have low heat resistance and low corrosion resistance. The former problem can be solved by selecting the alloy composition, but the latter problem can only be solved by taking anti-corrosion measures.
防食手段として現在実用されているのは、防錆塗料であ
る。 塗料はエポキシ樹脂が好／υで用いられており、
塗装法は電着塗装（エポキシカチオンの電着）が常法と
なっている。 具体的には、たとえばリング状の磁石で
あれば、ひとつずつ導体フックに吊り下げたものをまと
めてカソードとし、水溶性エポキシ樹脂の水溶液中に浸
漬し、別に設けたアノードとの間に２００Ｖ程度の電圧
を印加して、２分間またはそれ以上の適宜の時間にわた
って電着を行なう。 引き揚げて水洗し、代表的には１
５０℃に３０分間加熱する硬化処理により焼き付け、塗
装を終る。Anticorrosive paints are currently in practical use as a means of preventing corrosion. Epoxy resin is preferably used for paint,
The conventional coating method is electrodeposition (electrodeposition of epoxy cations). Specifically, for example, in the case of a ring-shaped magnet, the magnets are suspended one by one from a conductor hook and used as a cathode, immersed in an aqueous solution of water-soluble epoxy resin, and connected to a separate anode with a voltage of about 200V. Electrodeposition is carried out for a suitable time of 2 minutes or more by applying a voltage of . Pull it out and wash it with water, typically 1
The coating is completed by baking and curing by heating at 50°C for 30 minutes.
この電着塗装には、つぎのような弱点がある。This electrodeposition coating has the following weaknesses.
イ）浸漬時同伴された空気や電解により生じたガスが塗
料の電着を妨げ、ピンホールが発生する。b) Air entrained during dipping and gas generated by electrolysis interfere with electrodeposition of paint, resulting in pinholes.
口）エツジ、コーナーの部分へのつき回りがよくない。Mouth) It doesn't stick well to edges and corners.
ハ）電極の接触跡が塗装されずに残る。c) Contact traces of the electrode remain unpainted.
［発明が解決しようとする課題］
本発明の目的は、希土類磁石に対して、電着塗装による
塗料がつかないか、または不足な部分があっても、そこ
から直、ちに発錆が進むことのない程度に改善されたコ
ーティングを行なうことのできる方法を提供することに
ある。[Problems to be Solved by the Invention] The purpose of the present invention is to prevent rusting from occurring immediately even if there are areas where the electrodeposited paint does not stick to rare earth magnets or is insufficient. The object of the present invention is to provide a method capable of performing a coating that is improved to an unprecedented extent.
（課題を解決するための手段］
本発明の希土類磁石のコーティング方法は、Ｒ−Ｆｅ−
Ｂ系磁石の表面に、ＳｉまたはＡ、Ｉ！を含有するアル
カリ性水溶液を適用することにより厚さ１〜４μの無機
質物の被膜を形成し、ついで電着塗装を行なうことから
なる。(Means for Solving the Problems) The method for coating a rare earth magnet of the present invention includes R-Fe-
Si or A, I! on the surface of the B-based magnet. A coating of an inorganic material having a thickness of 1 to 4 micrometers is formed by applying an alkaline aqueous solution containing , and then electrodeposition coating is performed.
ＳｌおよびＡ、ｌ！を含有するアルカリ性水溶液は、た
とえば水ガラスとよばれるケイ酸ナトリウムＮａ２Ｓｉ
Ｏ３の水溶液、アルミン酸ナトリウムＮａ ３Ａ、Ｑ
Ｏ３の水溶液、それらの混合物でおる。Sl and A, l! An alkaline aqueous solution containing, for example, sodium silicate Na2Si called water glass.
Aqueous solution of O3, sodium aluminate Na3A,Q
an aqueous solution of O3, and a mixture thereof.
ボルトなどの金属製品の表面処理材として最近市販され
るようになった無機質物のアルカリ性水溶液もまた、本
発明にとって有用であることが確認された。Alkaline aqueous solutions of inorganic substances, which have recently become commercially available as surface treatment materials for metal products such as bolts, have also been found to be useful for the present invention.
これらの水溶液の適用は、磁石を液中に浸漬して行なっ
てもよいし、流しかけやスプレーによって適用してもよ
い。 液は比較的粘いから、遠心脱水などの手段で適量
だけ残して余分な液を除くようにするとよい。 遠心脱
水の回転数を調節することにより、残留液量を調節する
ことができる。These aqueous solutions may be applied by immersing the magnet in the solution, or by pouring or spraying. Since the liquid is relatively viscous, it is best to remove excess liquid by centrifugal dehydration or other means, leaving only an appropriate amount. The amount of residual liquid can be adjusted by adjusting the rotation speed of centrifugal dehydration.
続いて乾燥して、電着塗装に移る。 電着塗装以後は、
前記した常法に従えばよい。Then dry and move on to electrodeposition painting. After electrocoating,
The conventional method described above may be followed.
［作 用］
ＳｉまたはＡ、Ｉ！を含有するアルカリ性水溶液は、こ
れを磁石に適用して乾燥することにより、薄い被膜を形
成する。 この−次被膜は主として酸化物、水酸化物か
ら成っていて・、ある程度の電導度をもっているから、
厚さ４μ程度までは電着塗装に必要な程度の電流を通す
ことができる。[Function] Si or A, I! An alkaline aqueous solution containing the above is applied to a magnet and dried to form a thin film. This secondary film is mainly composed of oxides and hydroxides and has a certain degree of conductivity, so
It is possible to pass the current necessary for electrodeposition coating up to a thickness of about 4 μm.
従って、この被膜をほぼ全面に有する磁石は、直接電着
塗装する場合と同様に塗装して、二次被膜を形成するこ
とができる。 その結果、磁石の表面はほとんどが一次
被膜と二次被膜とに覆われており、−次被膜が形成され
なかった点は二次被膜がカバーし、一方、二次被膜が形
成されなかった点には一次被膜が存在することになり、
磁石合金が直接露出することはなくなる。 このように
して、本発明の方法でコーティングした磁石は、単に電
着塗装したものにくらべ、耐食性が格段に向上している
。Therefore, a magnet having this coating on almost its entire surface can be coated to form a secondary coating in the same manner as in the case of direct electrodeposition coating. As a result, most of the surface of the magnet was covered by the primary film and the secondary film, and the points where the secondary film was not formed were covered by the secondary film, while the points where the secondary film was not formed were covered by the secondary film. There is a primary film in the
The magnet alloy is no longer directly exposed. In this way, magnets coated by the method of the present invention have significantly improved corrosion resistance compared to those simply coated by electrodeposition.
上記の一次被膜は比較的強固に付着しており、薄くても
それなりの防食機能はもっているが、最少限１μの厚さ
は必要である。The above-mentioned primary coating adheres relatively firmly and has a certain anti-corrosion function even if it is thin, but a minimum thickness of 1 μm is required.
［実施例］
Ｎｄ −Ｆｅ −Ｂ合金の粉末にエポキシ樹脂を２重量
％はど混練して、外径１０ｍ、内径１５Ｍ、高さ１０ｍ
のリング状に成形した。 これを数十個、径約５０ｃｍ
、深さ３０ｃｍのプラスチック製バスケットに入れ、市
販の金属表面処理剤を水で１０倍にうすめた液（ｐＨ１
０〜１３）中に２分間浸漬した。[Example] Nd-Fe-B alloy powder was mixed with 2% by weight of epoxy resin to form an outer diameter of 10 m, an inner diameter of 15 m, and a height of 10 m.
It was formed into a ring shape. Dozens of these, about 50cm in diameter
, put it in a plastic basket with a depth of 30 cm, and add a solution of a commercially available metal surface treatment agent diluted 10 times with water (pH 1).
0 to 13) for 2 minutes.
引き揚げて遠心脱水機にかけ、余分の液を除いた。 こ
のとき、回転数を２００〜１５００ｒｐＩＩ＋の範囲で
変えて、液の残留量をコントロールした。It was salvaged and put into a centrifugal dehydrator to remove excess liquid. At this time, the number of rotations was varied within the range of 200 to 1500 rpII+ to control the amount of remaining liquid.
１２０’Ｃの空気浴中に５分間入れて乾燥して一次被膜
を形成してから、エポキシ樹脂塗料の電着塗装を行なっ
た。 印加電圧２００Ｖ、 この二次被膜の厚さは、
２０μ程度になるようにした。After drying in an air bath at 120'C for 5 minutes to form a primary film, an epoxy resin paint was applied by electrodeposition. The applied voltage is 200V, and the thickness of this secondary coating is:
The thickness was set to about 20μ.
−次被膜の厚さが、二次被膜を２０μの厚さに形成する
ために要する電着時間にどのように影響するかをしらべ
て、第１図に示す結果を得た。- We investigated how the thickness of the secondary coating affected the electrodeposition time required to form the secondary coating to a thickness of 20 μm, and obtained the results shown in FIG.
厚さ４μ近辺まではほとんど変化なく、−次被膜が電着
塗装に対し何ら妨げとなっていないこと、４μを超える
と急激に電着が遅くなること、が第１図のグラフかられ
かる。It can be seen from the graph in FIG. 1 that there is almost no change up to a thickness of about 4 μm, and that the secondary coating does not interfere with electrodeposition coating at all, and that when the thickness exceeds 4 μm, electrodeposition slows down rapidly.
電着時間の長短はあれ、２０μの厚さに形成した二次被
膜がどの程度の機能をもっているかを知るため、表面の
鉛筆硬度を測定するとともに、８０°Ｃ，ＲＨ９５％の
環境に置く湯側試験を行なった。Regardless of the length of the electrodeposition time, in order to find out how well the secondary film formed to a thickness of 20 μm has, we measured the pencil hardness of the surface and placed it on the hot water side in an environment of 80°C and 95% RH. I conducted a test.
それらの結果を、−次被膜の厚さとの関係で示せば、第
２図および第３図のとおりである。 −次被膜の厚さが
４μを超えると、同じ２０μの厚さの二次被膜も、鉛筆
硬度が低下したり湿潤耐久時間が短くなうたりするのは
、電着塗装が円滑に進行しないため、塗料のつき方や厚
さが不均一になって、欠陥をもった部分が目にみえて増
大するのが原因と考えられる。The results are shown in FIGS. 2 and 3 in relation to the thickness of the -order coating. -If the thickness of the secondary coating exceeds 4μ, the pencil hardness and wet durability time will be shortened even with the same thickness of 20μ because the electrodeposition coating does not progress smoothly. This is thought to be due to uneven paint application and thickness, which causes the number of defective areas to visibly increase.
［発明の効果］
本発明の方法によって希土類磁石のコーティングを行な
えば、耐食性の低いＲ−Ｆｅ−Ｂ系ｔａ石も、その表面
が一次被膜および二次被膜の少なくとも一方で保護され
て直接露出する部分がなくなるから、環境耐性が著しく
向上する。[Effects of the Invention] When a rare earth magnet is coated by the method of the present invention, even R-Fe-B type talonite with low corrosion resistance can be directly exposed with its surface protected by at least one of the primary coating and the secondary coating. Since there are no parts, environmental resistance is significantly improved.
−次被膜の形成は安価な原料を使用した単純な操作であ
って、特別な技術も設備も要らず、耐食性向上のための
コストに与える影響は、とるに足らない。- Formation of the second coating is a simple operation using inexpensive raw materials, does not require special techniques or equipment, and has a negligible effect on the cost for improving corrosion resistance.
図面はいずれも本発明の実施例のデータを掲げたもので
あって、
第１図は、−次被膜の厚さが一定の厚さの二次被膜であ
る電着塗装を、形成するまでの時間に及ぼす影響を示し
、
第２図は、一定の厚さの二次被膜を形成したときに、−
次被膜の厚さが鉛筆硬度に及ぼす影響を示し、
第３図は、同様に一次被膜の厚さが湿潤耐久時間に及ぼ
す影響を示す。
特許出願人 大同特殊鋼株式会社
代理人 弁理士 須 賀 総 火
弟１図
一次榴欣販Δ ［μｍ
（−＝−次被膜：２０μ）The drawings all show data of examples of the present invention, and Figure 1 shows the process up to the formation of an electrodeposition coating in which the secondary coating has a constant thickness. The effect on time is shown in Figure 2, when a secondary film of a certain thickness is formed, -
The effect of the thickness of the primary coating on the pencil hardness is shown, and FIG. 3 similarly shows the effect of the thickness of the primary coating on the wet durability time. Patent Applicant Daido Steel Co., Ltd. Agent Patent Attorney Sou Suga 1 Figure Primary Coating Sales Δ [μm (-=-Next Coating: 20μ)
Claims (1)
るアルカリ性水溶液を適用することにより厚さ１〜４μ
の無機質物の被膜を形成し、ついで電着塗装を行なうこ
とからなる希土類磁石のコーティング方法。By applying an alkaline aqueous solution containing Si or Al to the surface of an R-Fe-B magnet, a thickness of 1 to 4 μm can be obtained.
A method of coating rare earth magnets, which comprises forming a film of an inorganic substance and then performing electrodeposition coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63075616A JP2770857B2 (en) | 1988-03-29 | 1988-03-29 | Rare earth magnet coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63075616A JP2770857B2 (en) | 1988-03-29 | 1988-03-29 | Rare earth magnet coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01245880A true JPH01245880A (en) | 1989-10-02 |
| JP2770857B2 JP2770857B2 (en) | 1998-07-02 |
Family
ID=13581315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63075616A Expired - Lifetime JP2770857B2 (en) | 1988-03-29 | 1988-03-29 | Rare earth magnet coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2770857B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102397836A (en) * | 2010-09-10 | 2012-04-04 | 北京中科三环高技术股份有限公司 | Surface treatment method for spraying organoaluminum on permanent magnet |
| CN102397835A (en) * | 2010-09-10 | 2012-04-04 | 北京中科三环高技术股份有限公司 | Method for performing surface treatment on neodymium-iron-boron permanent magnet material by using nano ceramic |
| CN102453431A (en) * | 2010-10-14 | 2012-05-16 | 北京中科三环高技术股份有限公司 | Silanization surface treatment technology of permanent magnetic material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60186571A (en) * | 1984-03-06 | 1985-09-24 | Nippon Meeder Kk | Method of surface treatment with corrosion-resistant film |
| JPS61130453A (en) * | 1984-11-28 | 1986-06-18 | Sumitomo Special Metals Co Ltd | Permanent magnet material having superior corrosion resistance and its manufacture |
-
1988
- 1988-03-29 JP JP63075616A patent/JP2770857B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60186571A (en) * | 1984-03-06 | 1985-09-24 | Nippon Meeder Kk | Method of surface treatment with corrosion-resistant film |
| JPS61130453A (en) * | 1984-11-28 | 1986-06-18 | Sumitomo Special Metals Co Ltd | Permanent magnet material having superior corrosion resistance and its manufacture |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102397836A (en) * | 2010-09-10 | 2012-04-04 | 北京中科三环高技术股份有限公司 | Surface treatment method for spraying organoaluminum on permanent magnet |
| CN102397835A (en) * | 2010-09-10 | 2012-04-04 | 北京中科三环高技术股份有限公司 | Method for performing surface treatment on neodymium-iron-boron permanent magnet material by using nano ceramic |
| CN102453431A (en) * | 2010-10-14 | 2012-05-16 | 北京中科三环高技术股份有限公司 | Silanization surface treatment technology of permanent magnetic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2770857B2 (en) | 1998-07-02 |
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