JPH01286407A - Rare earth permanent magnet superior in corrosion resistance and its manufacture - Google Patents
Rare earth permanent magnet superior in corrosion resistance and its manufactureInfo
- Publication number
- JPH01286407A JPH01286407A JP11494388A JP11494388A JPH01286407A JP H01286407 A JPH01286407 A JP H01286407A JP 11494388 A JP11494388 A JP 11494388A JP 11494388 A JP11494388 A JP 11494388A JP H01286407 A JPH01286407 A JP H01286407A
- Authority
- JP
- Japan
- Prior art keywords
- rare earth
- corrosion resistance
- plating
- sintered magnet
- permanent magnet
- 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
- 230000007797 corrosion Effects 0.000 title claims abstract description 20
- 238000005260 corrosion Methods 0.000 title claims abstract description 20
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 19
- 150000002910 rare earth metals Chemical class 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000009713 electroplating Methods 0.000 claims abstract description 21
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 19
- 239000000956 alloy Substances 0.000 claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 239000006104 solid solution Substances 0.000 claims abstract description 12
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 5
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000007423 decrease Effects 0.000 claims description 2
- 238000007747 plating Methods 0.000 abstract description 42
- 239000007864 aqueous solution Substances 0.000 abstract description 11
- 230000003647 oxidation Effects 0.000 abstract description 7
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 150000003839 salts Chemical class 0.000 abstract description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 229910001172 neodymium magnet Inorganic materials 0.000 description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 229910000990 Ni alloy Inorganic materials 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- CLDVQCMGOSGNIW-UHFFFAOYSA-N nickel tin Chemical compound [Ni].[Sn] CLDVQCMGOSGNIW-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000004663 powder metallurgy Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RSEBUVRVKCANEP-UHFFFAOYSA-N 2-pyrroline Chemical compound C1CC=CN1 RSEBUVRVKCANEP-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- XPPKVPWEQAFLFU-UHFFFAOYSA-N diphosphoric acid Chemical compound OP(O)(=O)OP(O)(O)=O XPPKVPWEQAFLFU-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229940005657 pyrophosphoric acid Drugs 0.000 description 1
- ZVJHJDDKYZXRJI-UHFFFAOYSA-N pyrroline Natural products C1CC=NC1 ZVJHJDDKYZXRJI-UHFFFAOYSA-N 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Landscapes
- Electroplating Methods And Accessories (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はＲ，Ｆｅ、Ｂを主成分とする永久磁石合金に関
し、特に耐食性に優れた希土類永久磁石合金及びその製
造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a permanent magnet alloy containing R, Fe, and B as main components, and particularly to a rare earth permanent magnet alloy with excellent corrosion resistance and a method for producing the same.
［従来の技術］
Ｒ−Ｆｅ−Ｂ系焼結磁石合金は、所定の組成から成るイ
ンゴットを粉砕し、粉末冶金法による焼結して得られる
。そして、この合金は従来の希土類磁石であるＳｍ−Ｃ
ｏ系磁石に比較して高い磁気特性を有する。[Prior Art] An R-Fe-B sintered magnet alloy is obtained by crushing an ingot having a predetermined composition and sintering it using a powder metallurgy method. This alloy is a conventional rare earth magnet, Sm-C.
It has higher magnetic properties than o-based magnets.
しかしながら、Ｒ−Ｆｅ−Ｂ系磁石合金は、この金属組
織中に、極めて酸化し易いＮｄ−Ｆｅ固溶体相を含有し
ている為、磁気回路等の装置に組み込んだ場合、通常の
環境条件下でもＳｍ−Ｃ。However, since the R-Fe-B magnet alloy contains a Nd-Fe solid solution phase that is extremely easily oxidized in its metal structure, it cannot be used even under normal environmental conditions when incorporated into devices such as magnetic circuits. Sm-C.
系磁石に比べ磁石の酸化による特性の劣化、及びそのば
らつきも大きい、さらに、磁石から発生した酸化物の飛
散による周辺部への影響も引き起こす。Compared to other magnets, the characteristics of the magnet deteriorate due to oxidation and the variation thereof is large.Furthermore, the scattering of oxides generated from the magnet also causes an impact on the surrounding area.
このため得られたこの磁石にめっきを施し耐食性を向上
させる試みが、特開昭４９−８６８９６号公報、あるい
は特開昭６０−６３９０１号公報などに見られるが、こ
の場合磁石製造中に発生する酸化を防ぐことは困難であ
る。For this reason, attempts to improve the corrosion resistance by plating the obtained magnets can be seen in Japanese Patent Application Laid-Open No. 49-86896 and Japanese Patent Application Laid-Open No. 60-63901, but in this case, problems that occur during magnet manufacturing It is difficult to prevent oxidation.
一方、従来からアルカリ性水溶液めっき浴にて電解めっ
きを行うと、金属Ｍｉ繊織中極めて酸化され易いＮｄ−
Ｆｅ固溶体相が腐食し溶は出してしまい、きれいな密着
性の良いめっき膜は得られず、使用中にその部分より錆
が発生し、耐食性に優れためっき膜を得ることが出来な
い問題点を有している。On the other hand, when electrolytic plating is conventionally performed in an alkaline aqueous plating bath, Nd-
The Fe solid solution phase corrodes and dissolves, making it impossible to obtain a clean plating film with good adhesion. Rust occurs from that area during use, making it impossible to obtain a plating film with excellent corrosion resistance. have.
本発明は、前項で述べた問題点を解決するためのもので
あり、その技術ａ題は電解めっき中でのＮｄ−Ｆｅ固溶
体相の酸化を防ぐとともに、磁石表面に密着性の良いめ
っき膜を形成し、耐食性に優れた希土類永久磁石合金及
びその製造方法を提供することにある。The present invention is intended to solve the problems mentioned in the previous section, and its technical objective is to prevent the oxidation of the Nd-Fe solid solution phase during electrolytic plating and to form a plating film with good adhesion on the magnet surface. An object of the present invention is to provide a rare earth permanent magnet alloy that can be formed and has excellent corrosion resistance, and a method for manufacturing the same.
［課題を解決するための手段］
本発明によれば、Ｒ−Ｆｅ−Ｂ（Ｒはイツトリウムを含
む希土類元素を表わす。）系焼結磁石台金め表面に０．
１μｍ以上の厚さの密着性の良い電解めっき層を有し、
この電解めっき層は、この焼結磁石合金との界面から、
この電解めっき層表面に向ってＲ−Ｆｅ固溶体相が漸減
していることを特徴とする耐食性に優れた希土類永久磁
石が得られる。[Means for Solving the Problems] According to the present invention, the surface of the base plate of an R-Fe-B (R represents a rare earth element including yttrium) sintered magnet is coated with 0.
It has an electroplated layer with good adhesion with a thickness of 1 μm or more,
This electrolytic plated layer, from the interface with this sintered magnet alloy,
A rare earth permanent magnet with excellent corrosion resistance is obtained, which is characterized in that the R-Fe solid solution phase gradually decreases toward the surface of the electroplated layer.
本発明によれば、Ｒ−Ｆｅ−Ｂ（Ｒはイツトリウムを含
む希土類元素を表わす。）系焼結磁石合金の表面に、電
解めっき層を金属塩を含むアルカリ性浴で電着する希土
類永久磁石の製造方法において、上記アルカリ性浴は、
５．０ｐｐｍ以下の溶存酸素を含むことを特徴とする耐
食性に優れた希土類永久磁石の製造方法が得られる。According to the present invention, a rare earth permanent magnet is produced in which an electrolytic plating layer is electrodeposited on the surface of an R-Fe-B (R represents a rare earth element containing yttrium) based sintered magnet alloy in an alkaline bath containing a metal salt. In the manufacturing method, the alkaline bath includes:
A method for producing a rare earth permanent magnet having excellent corrosion resistance and containing 5.0 ppm or less of dissolved oxygen is obtained.
ここで、本発明の耐食性に優れた希土類永久磁石の製造
方法において、上記焼結磁石合金を陰極とし、通電しな
がら上記アルカリ性浴に浸漬することが望ましい。In the method of manufacturing a rare earth permanent magnet with excellent corrosion resistance according to the present invention, it is desirable to use the sintered magnet alloy as a cathode and immerse it in the alkaline bath while applying electricity.
即ち、金属塩を溶解した水溶液めっき浴、特にアルカリ
性のめっき浴にて電解めっきを行うと、Ｎｄ−Ｆｅ−Ｒ
磁石合金の場合、金属組織中で極めて酸化され易いＮｄ
−Ｆｅ固溶体相が選択的に腐食してしまう０表面はＮｄ
−Ｆｅ固溶体相が腐食し溶は出した部分に穴があき、き
れいな密着性の良いめっき膜は得られず、通常の環境条
件下でもその部分より酸化が進行する。電解めっき中電
流密度が高い程、その傾向は顕著である。That is, when electrolytic plating is performed in an aqueous plating bath in which a metal salt is dissolved, especially an alkaline plating bath, Nd-Fe-R
In the case of magnetic alloys, Nd is extremely easily oxidized in the metal structure.
-The surface where the Fe solid solution phase is selectively corroded is Nd.
A hole is formed in the part where the -Fe solid solution phase corrodes and the solution is released, making it impossible to obtain a clean plating film with good adhesion, and oxidation progresses from that part even under normal environmental conditions. The higher the current density during electrolytic plating, the more remarkable this tendency is.
この事を様々調べてみると、水溶液中の溶存酸素の量が
大きく影響していることが判明した。通常水溶液中に含
まれる溶存酸素は多く（飽和値２０ｐｐｌ／ｊ ） 、
水溶液中に酸素が溶存していると電解めっき中に、Ｎｄ
−Ｆｅ固溶体相は酸素の還元により腐食してしまう。After various investigations into this matter, it was found that the amount of dissolved oxygen in the aqueous solution has a large effect. There is usually a lot of dissolved oxygen contained in an aqueous solution (saturation value 20 ppl/j),
When oxygen is dissolved in the aqueous solution, Nd
-Fe solid solution phase corrodes due to oxygen reduction.
この様に、溶存酸素を多く含む水溶液中で電解めっきを
行うと、耐食性に優れためっき膜を得ることが困難であ
る。As described above, when electrolytic plating is performed in an aqueous solution containing a large amount of dissolved oxygen, it is difficult to obtain a plated film with excellent corrosion resistance.
そこで、本発明では使用する水溶液をあらかじめＮ２ガ
スあるいはＡｒガス等の不活性ガスによりバブリングを
行い、溶存酸素を極力除去し、その量が５．０１１１）
ＩＩ／ Ｊ以下、望ましくは１．０ｐｐＩｌ／Ｊ以下に
なる様にすることが必要であることを見い出し外。Therefore, in the present invention, the aqueous solution used is bubbled in advance with an inert gas such as N2 gas or Ar gas to remove as much dissolved oxygen as possible, and the amount of dissolved oxygen is 5.0111).
It is outside the scope of this article that it is necessary to keep the concentration below II/J, preferably below 1.0 ppIl/J.
溶存酸素を抜いた水溶液を用いて電解めっきを行った場
合、Ｎｄ−Ｆｅ固溶体相が選択的に腐食することなく、
きれいな密着性の良いめっき膜が得られ、溶存酸素を抜
いた効果が顕著に見られた。When electrolytic plating is performed using an aqueous solution free of dissolved oxygen, the Nd-Fe solid solution phase does not selectively corrode.
A clean plating film with good adhesion was obtained, and the effect of removing dissolved oxygen was noticeable.
アルカリ性浴電解めっきの金属は、磁石中に含まれる希
土類金属より酸化されにくい金属であれば何でもよく、
−数的にアルカリ性電解めっき浴として、Ｃｕめっきで
はピロリン該別めっき浴、スズめっきでは、ナトリウム
浴あるいはカリウム浴、スズ−ニッケル合金めっきでは
ピロリン酸化浴等あげられる。The metal for alkaline bath electroplating may be any metal as long as it is less oxidized than the rare earth metals contained in the magnet.
- Examples of numerically alkaline electrolytic plating baths include a pyrroline-separate plating bath for Cu plating, a sodium bath or potassium bath for tin plating, and a pyrrophosphate oxidation bath for tin-nickel alloy plating.
これらアルカリ性電解めっき浴のｐＨは８〜１２、浴温
は２０〜５０℃、電流密度は０．５〜１０ Ａ／ｄｎ＋
’の条件下でめっき膜の形成がなされる。These alkaline electrolytic plating baths have a pH of 8 to 12, a bath temperature of 20 to 50°C, and a current density of 0.5 to 10 A/dn+.
A plating film is formed under the following conditions.
特にＣｕめっきは、めっき膜表面が大気中にても酸化し
てしまう為、Ｎｉめっきの下地として使われる。In particular, Cu plating is used as a base for Ni plating because the surface of the plating film oxidizes even in the air.
めっき膜の厚さは０．１（μｍ）未満ではめっきが十分
に行なわれない為、磁石表面での酸化が進行し、また１
０（μｍ）以上では磁石の単位体積当りに含まれる非磁
性部分が多くなり、磁石の磁気性能が低下する為、めっ
き膜の厚さは０．１〜１０（μｍ）の範囲が望ましい。If the thickness of the plating film is less than 0.1 (μm), plating will not be performed sufficiently, and oxidation will progress on the magnet surface, and
If it is more than 0 (μm), the non-magnetic portion included per unit volume of the magnet will increase and the magnetic performance of the magnet will deteriorate, so the thickness of the plating film is preferably in the range of 0.1 to 10 (μm).
電解めっきを行う時、通常、試料をめっき液に浸漬して
から後、電圧をかけ、電解めっきを行うのが常である。When performing electrolytic plating, the sample is usually immersed in a plating solution and then a voltage is applied to perform electrolytic plating.
しかしながら、Ｎｄ−Ｆｅ−Ｂ磁石試片をアルカリ性め
っき浴に浸漬し、そのままにして置くとＮｄ−Ｆｅ固溶
体相が溶は出し腐食してしまう。液に浸漬し電解めっき
を行うと、密着性の良いきれいなめっき膜が形成される
。However, if a Nd-Fe-B magnet sample is immersed in an alkaline plating bath and left as is, the Nd-Fe solid solution phase will dissolve and corrode. When immersed in a solution and electrolytically plated, a clean plating film with good adhesion is formed.
本発明によれば、溶存酸素を抜いた水溶液を用いたアル
カリ性洛中にて電解めっきを行なった場合、磁石表面に
密着性の良いめっき膜が形成され、耐食性に優れ、かつ
磁石特性においても劣らない実用上非常に有益な磁石を
得ることが可能となった。According to the present invention, when electrolytic plating is performed in an alkaline solution using an aqueous solution from which dissolved oxygen has been removed, a plating film with good adhesion is formed on the magnet surface, has excellent corrosion resistance, and has comparable magnetic properties. It has now become possible to obtain a magnet that is extremely useful in practice.
以下、その実施例示す。Examples are shown below.
［実施例］
実施例１
粉末冶金法によって得られた３３ｗｔ％Ｎｄ−１，ｏｗ
ｔ％Ｂ−Ｆｅｂａｌの組成を６つ焼結体を１ｘ ７ ｘ
１０ （ｌｌ）の大きさに加工し、試料とした。[Example] Example 1 33 wt% Nd-1,ow obtained by powder metallurgy method
t%B-Febal composition 6 sintered body 1x 7x
It was processed into a size of 10 (ll) and used as a sample.
第１表に示すピロリン該別めっき浴（ストライク浴）に
て、アノード側にＣｕ板、カソード側にＮｄ−Ｆｅ−Ｂ
焼結体試片とし、２５°Ｃの浴温中にて、電流密度０．
５〜２．ＯＡ／ｄｌ１２の範囲で３０分間Ｃｕめっき行
った。この時金属塩を溶解するに用いた水溶液は予めＮ
２ガスにて３時間バブリングし、溶存酸素を極力除去し
たものであり１．０ｐｐｉ／１の溶存酸素量であった。In the pyrroline plating bath (strike bath) shown in Table 1, Cu plate is placed on the anode side and Nd-Fe-B is placed on the cathode side.
A sintered specimen was placed in a bath temperature of 25°C at a current density of 0.
5-2. Cu plating was performed for 30 minutes at an OA/dl of 12. At this time, the aqueous solution used to dissolve the metal salt was prepared with N
2 gases were bubbled for 3 hours to remove dissolved oxygen as much as possible, and the amount of dissolved oxygen was 1.0 ppi/1.
以下示日
電解密度を変化させた各試料について測定しなめっき層
の厚さとその外観を第２表に示す。Table 2 below shows the thickness and appearance of the plating layer measured for each sample with different electrolyte densities.
第２表に示される様に電流密度が増加するにつれ、めっ
き層は厚くなり、特に０．７５〜１．ＯＡ／ｄ１２の電
流密度で非常にきれいな金属光沢のあるＣｕめつきが得
られた。As shown in Table 2, as the current density increases, the plating layer becomes thicker, especially from 0.75 to 1. Cu plating with very beautiful metallic luster was obtained at a current density of OA/d12.
以下宗日
この時、素地（Ｎｄ−Ｆｅ−Ｂ）とＣｕめっきとの界面
に組織写真を第１図のＳＥＭ写真１に示した。第１図は
素地との密着性が非常に良く、のりの良いＣｕめっきが
得られていることを示している。Below, a photograph of the structure of the interface between the base material (Nd-Fe-B) and the Cu plating is shown in SEM photograph 1 in Figure 1 at this time. FIG. 1 shows that the Cu plating has very good adhesion to the substrate and has good adhesion.
次に、密着力試験として試片に外力（摩擦、折り曲げ、
衝撃等）を加えた時の影響を定性的に確かめた結果を第
３表に示した。Next, as an adhesion test, external forces (friction, bending,
Table 3 shows the results of qualitatively confirming the effects of applying shock, etc.).
以下余日
さらにＮｄ−Ｆｅ−Ｂ磁石表面にＣｕ下地めっき後電解
Ｎｉめっき処理を施した。これら試験片を６０℃×９５
％の恒温恒湿の条件下で１０００時間耐時間状験を行っ
た時の結果を第４表に示す。In the following days, the surface of the Nd-Fe-B magnet was subjected to Cu underplating and then electrolytic Ni plating. These test pieces were heated at 60°C x 95°C.
Table 4 shows the results of a 1000 hour durability test under constant temperature and humidity conditions.
以下余日 （−７−、、。Remaining days below (-7-,,.
ｉ ： ：
二 （Ｊ Ｕまた、第５表に
溶存酸素量とめっき表面状態を示した。i : : 2 (JU Table 5 also shows the amount of dissolved oxygen and the condition of the plating surface.
本発明による試験片は赤さび、剥離、ふくれ等の欠点を
生ずることなく、非常に耐食性に優れていることがわか
る。It can be seen that the test piece according to the present invention has excellent corrosion resistance without causing defects such as red rust, peeling, and blistering.
以下＊Ｓ
実施例２
第６表に示す様に、溶存酸素を抜いた水溶液を用いたス
ズめっき浴（ナトリウム浴）にて、アノード側にＳｎ板
、カソード側にＮｄ−Ｆｅ−Ｂ焼結体試片とし、６０°
Ｃの浴温中にて、電流密度１、ＯＡ／ｄｌ’で１０分間
電解めっきを行ったところ、５．０−μｍスズめっき層
が得られた。Below *S Example 2 As shown in Table 6, in a tin plating bath (sodium bath) using an aqueous solution from which dissolved oxygen was removed, a Sn plate was placed on the anode side and a Nd-Fe-B sintered body was placed on the cathode side. As a specimen, 60°
When electrolytic plating was performed for 10 minutes at a current density of 1 and OA/dl' in a bath temperature of C, a 5.0-μm tin plating layer was obtained.
素地とスズめっきとの密着性は非常に良く、密着力試験
でもふくれ、剥離等の欠陥は無かった。The adhesion between the substrate and the tin plating was very good, and there were no defects such as blistering or peeling in the adhesion test.
又、６０℃Ｘ９５％の恒温、恒湿の粂件下で１０００時
間耐食性試験を行ったところ、赤さび、ふくれ、剥離等
の変化は何ら観察されなかった。Further, when a corrosion resistance test was conducted for 1000 hours under constant temperature and humidity conditions of 60° C. and 95%, no changes such as red rust, blistering, or peeling were observed.
以下余日
実施例３
第７表に示す様に、溶存酸素を抜いた水溶液を用いたス
ズ−ニッケル合金めっき浴（ピロリン酸浴、５ｎ７０−
Ｎｉ３０浴）にて、アノード側に７０ｗｔ％Ｓロー３０
ｗｔ％Ｎｉ合金板、カソード側にＮｄ−Ｆｅ−Ｂ焼結体
試片とし、５０℃の浴温中にて、電流密度１．ＯＡ／ｄ
ｎ”で１０分間電解めっきを行ったところ、４．０μｍ
スズ−ニッケルめっき層が得られた。As shown in Table 7, Example 3 for the rest of the day is a tin-nickel alloy plating bath (pyrophosphoric acid bath, 5n70-
Ni30 bath), 70 wt% S low 30 on the anode side.
A wt% Ni alloy plate, a Nd-Fe-B sintered specimen on the cathode side, and a current density of 1. OA/d
When electrolytic plating was performed for 10 minutes at 4.0μm
A tin-nickel plating layer was obtained.
合金板の素地とスズめっき層との密着性は非常に良く、
密着力試験でもふくれ、剥離等の欠陥は無かった。The adhesion between the alloy plate base and the tin plating layer is very good.
There were no defects such as blistering or peeling in the adhesion test.
又、６０℃×９５％の恒温恒湿の条件下で１０００時間
耐食性試験を行ったところ、赤さび、ふくれ、剥離等の
変化は何ら見られず、耐食性に非常に優れていることが
わかった。In addition, when a corrosion resistance test was conducted for 1000 hours under constant temperature and humidity conditions of 60° C. and 95%, no changes such as red rust, blistering, or peeling were observed, indicating that the material had excellent corrosion resistance.
獣下舎日
［発明の効果］
以上の詳述したように、本発明によれば、溶存酸素量を
極力とり除いた水溶液を用いることにより、アルカリ性
洛中にて電解めっきした場合、Ｒ−Ｆｅ−Ｂ磁石合金表
面に密着性の良いめっき膜が形成され、耐食性に非常に
優れた希土類永久磁石番得ることが出来る。[Effects of the Invention] As detailed above, according to the present invention, when electrolytic plating is carried out in an alkaline environment by using an aqueous solution with as little dissolved oxygen as possible, R-Fe- A plating film with good adhesion is formed on the surface of the B magnet alloy, and a rare earth permanent magnet number with excellent corrosion resistance can be obtained.
第１図はＮｄ−Ｆｅ−Ｂ磁石表面にＣｕめっきした時の
境界付近の破断面の金属組織を示すＳＥＭ写真である。
第２図は従来法によるめっき表面の金属組織を示すＳＥ
Ｍ写真である。
゛・こ゛−，′ＬFIG. 1 is an SEM photograph showing the metal structure of a fractured surface near the boundary when the surface of a Nd-Fe-B magnet is plated with Cu. Figure 2 is an SE showing the metal structure of the plating surface by the conventional method.
This is an M photo.゛・ko゛−、′L
Claims (3)
を表わす。）系焼結磁石合金の表面に０．１μｍ以上の
厚さの密着性の良い電解めっき層を有し、上記電解めっ
き層は、上記焼結磁石合金との界面から該電解めつき層
表面に向つてＲ−Ｆｅ固溶体相が漸減していることを特
徴とする耐食性に優れた希土類永久磁石。1. The surface of the R-Fe-B (R represents a rare earth element containing yttrium) based sintered magnet alloy has an electrolytic plating layer with a thickness of 0.1 μm or more and good adhesion, and the electrolytic plating layer is A rare earth permanent magnet having excellent corrosion resistance, characterized in that the R-Fe solid solution phase gradually decreases from the interface with the sintered magnet alloy toward the surface of the electrolytically plated layer.
を表わす。）系焼結磁石合金の表面に電解めつき層をア
ルカリ性浴から電着させる希土類永久磁石の製造方法に
おいて、 上記アルカリ性浴は、５．０ｐｐｍ以下の溶存酸素を含
むことを特徴とする耐食性に優れた希土類永久磁石の製
造方法。2. In a method for producing a rare earth permanent magnet in which an electrolytically plated layer is electrodeposited on the surface of an R-Fe-B (R represents a rare earth element containing yttrium) based sintered magnet alloy from an alkaline bath, the alkaline bath comprises: A method for producing a rare earth permanent magnet with excellent corrosion resistance, characterized by containing .0 ppm or less of dissolved oxygen.
ルカリ性浴に浸漬することを特徴とする第２の請求項記
載の耐食性に優れた希土類永久磁石の製造方法。3. 2. The method of manufacturing a rare earth permanent magnet having excellent corrosion resistance according to claim 2, wherein the sintered magnet alloy is used as a cathode and the magnet is immersed in the alkaline bath while being energized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11494388A JP2617113B2 (en) | 1988-05-13 | 1988-05-13 | Rare earth permanent magnet excellent in corrosion resistance and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11494388A JP2617113B2 (en) | 1988-05-13 | 1988-05-13 | Rare earth permanent magnet excellent in corrosion resistance and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01286407A true JPH01286407A (en) | 1989-11-17 |
| JP2617113B2 JP2617113B2 (en) | 1997-06-04 |
Family
ID=14650493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11494388A Expired - Fee Related JP2617113B2 (en) | 1988-05-13 | 1988-05-13 | Rare earth permanent magnet excellent in corrosion resistance and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2617113B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314756A (en) * | 1991-11-27 | 1994-05-24 | Hitachi Metals, Ltd. | Permanent magnet of rare-earth-element/transition-metal system having improved corrosion resistance and manufacturing method thereof |
| US7473343B2 (en) | 2003-03-05 | 2009-01-06 | Tdk Corporation | Method of manufacturing rare-earth magnet, and plating bath |
| WO2012111353A1 (en) * | 2011-02-15 | 2012-08-23 | 日立金属株式会社 | Production method for r-fe-b sintered magnet having plating film on surface thereof |
-
1988
- 1988-05-13 JP JP11494388A patent/JP2617113B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5314756A (en) * | 1991-11-27 | 1994-05-24 | Hitachi Metals, Ltd. | Permanent magnet of rare-earth-element/transition-metal system having improved corrosion resistance and manufacturing method thereof |
| US7473343B2 (en) | 2003-03-05 | 2009-01-06 | Tdk Corporation | Method of manufacturing rare-earth magnet, and plating bath |
| WO2012111353A1 (en) * | 2011-02-15 | 2012-08-23 | 日立金属株式会社 | Production method for r-fe-b sintered magnet having plating film on surface thereof |
| US9267217B2 (en) | 2011-02-15 | 2016-02-23 | Hitachi Metals, Ltd. | Production method for R—Fe—B based sintered magnet having plating film on surface thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2617113B2 (en) | 1997-06-04 |
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