CN1064374A - The neodymium iron boron Zn-plated magnetic ring and the electro-plating method thereof of clock step motor rotor - Google Patents
The neodymium iron boron Zn-plated magnetic ring and the electro-plating method thereof of clock step motor rotor Download PDFInfo
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- CN1064374A CN1064374A CN 92101307 CN92101307A CN1064374A CN 1064374 A CN1064374 A CN 1064374A CN 92101307 CN92101307 CN 92101307 CN 92101307 A CN92101307 A CN 92101307A CN 1064374 A CN1064374 A CN 1064374A
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Abstract
The invention provides the clock step motor rotor Nd Fe B alloys magnet ring of a kind of plating zinc and chromate passivation film, and the electro-plating method of making this magnet ring is provided.This method comprises: with the ultrasonic oil removing of the aqueous solution of the cleaning agent that contains dish washing detergent and/or wet oil amphiphilic solvent, surfactant, corrosion inhibiter, promoter, absolute ethyl alcohol ultra-sonic dehydration, pure water soak, activate, use earlier the bright galvanization of heavy current impact, rare nitric acid bright dipping, passivation, hot-water soak and dry each step, prepared magnet ring, magnetic property is stable.
Description
The present invention relates to the neodymium iron boron clock step motor rotor magnetic ring of plating zinc protective layer.The present invention also relates to the electrogalvanising method of neodymium iron boron clock step motor rotor magnetic ring.
As everyone knows, the clock step motor rotor magnetic ring, available samarium-cobalt alloy permanent magnetic material is made.But because this permanent magnetic material contains cobalt amount height, samarium is lower again in the occurring in nature abundance, so material cost is higher, in addition, this permanent magnetic material fragility is big, poor processability, and rate of finished products is low, causes processing cost to improve, and the magnetic energy product of this rapidoprint is low, so range of application is restricted.
People are known, and the magnetic energy product of neodymium-iron-boron magnetic material is than samarium-cobalt alloy height, and it has replaced cobalt with respect to SmCo with iron, and the neodymium higher with abundance ratio replaced samarium, so material cost is comparatively cheap.In addition, its good processability, the rate of finished products height, processing cost is low, therefore, on these performances of Nd-Fe-Bo permanent magnet material and advantage economically, makes it that very big potential use be arranged.But, the same with other rare earth element, neodymium especially has the unfavorable tendency of easy oxidation in humid air in air, this oxidation, not only make magnet surface produce oxide skin(coating), but also can expand, cause along the intercrystalline corrosion of crystal boundary development at material internal, thereby make the big high attenuation of magnetic property, this is for the neodymium-iron-boron magnetic material made from powder metallurgic method, and consequence is particularly serious, and magnet meeting sometimes is " efflorescence " fully.Therefore, Nd-Fe-Bo permanent magnet material must have and can shield and can make long-time more stable protective layer and the processing method of magnetic property, could its practical value be arranged industrial.
In order to solve the etching problem of neodymium-iron-boron magnetic material, a lot of methods have been proposed in the document, in the U.S. Pat 5,013,411, a kind of method that contains the magnetic material of neodymium iron boron with nickel or nickel alloy electrolysis plating is disclosed.With the magnet that the method was handled, the magnetic attenuation rate is about the 3%(experimental condition and is: (1) 80 ℃ and relative humidity 90%, 1000 hours time; (2) 2 atmospheric pressure, 120 ℃ of saturated vapors last 96 hours).But nickel dam is a cathodic electrodeposition coating, in case damaged to some extent, matrix can corrode sooner.And the cost of nickel plating is also high.Among the Chinese patent application prospectus CN86105540A, a kind of electrogalvanising method of rare-earth permanent magnet is disclosed, wherein with of 25 type the subtracting property detergent solution digestion oil removings of pending magnet with 1-5%, eliminate rust with the 5-15% salpeter solution, be zinc-plated in the electroplate liquid of 2-5 at PH then, cathode-current density is 3-5A/dm during plating
2Chinese patent application prospectus CN1056133A(application number 91106134.7) in, a kind of method of Nd Fe B alloys electrogalvanizing is disclosed, wherein with pending alloy with about 5% metal degreasing agent oil removing, eliminate rust with the 5-15% hydrochloric acid solution, carry out cathode treatment with the 40-80% sodium hydroxide solution that contains chelating agent, again with the weak corrosion of 5-15% hydrochloric acid solution, the bright zinc of light-plated then.Method in above-mentioned two Chinese patent application focuses on the improvement of galvanized layer combining capacity, and not mentioned electroplating processes process is to the influence of magnetic property.
Therefore, purpose of the present invention is that a kind of both withstand corrosion in use, the Nd Fe B alloys magnetic element that magnetic property is stable again, the rotor magnetic ring of using in the especially small-sized clock step motor will be provided.
The purpose of this invention is by electrolytic coating one deck light zinc layer on the made clock step motor rotor magnetic ring of Nd-Fe-B alloy magnetic material, and forms on the zinc layer that one deck chromate passivation film reaches.
Clock step motor rotor magnetic ring provided by the invention, it is characterized in that its structure comprises: the magnet ring matrix that neodymium iron boron powder metallurgical alloy material is made, be plated on the electrolytic zinc layer on this matrix, and the chromating rete that on this zinc layer, forms, magnetic attenuation rate due to its electroplating processes is 1-6%, and the magnetic attenuation rate in the 2-5 operating period is 1% to 6%.
The present invention can provide more that the magnetic attenuation rate is 1-3% due to the electroplating processes, and in above-mentioned useful life period, the magnetic attenuation rate is 1% to 3% neodymium iron boron Zn-plated magnetic ring.
Another object of the present invention is that a kind of method that makes above-mentioned clock step motor rotor magnetic ring obtain electrogalvanising layer and chromating rete is provided.
Purpose of the present invention, the electrogalvanising method by a kind of clock step motor rotor magnetic ring realizes.
Electro-plating method provided by the invention comprises magnet ring is carried out preliminary treatment that activation electrogalvanizing and reprocessing is characterized in that described preliminary treatment comprises:
(1) in the aqueous solution of the cleaning agent that contains dish washing detergent and/or wet oil amphiphilic solvent, surfactant, corrosion inhibiter, promoter, under 20-50 ℃, the processing magnet ring is carried out ultrasonic oil removing, wash with water then;
(2) carry out ultra-sonic dehydration with absolute ethyl alcohol at normal temperatures, last 0.5-1h;
(3) in 10-30 ℃ of pure water, soak 5-15min;
Described activation is carried out 1-10sec in the normal-temperature water solution that contains 15-50g/l UV345 metal activation agent (the magnificent electroplating technology in Shenzhen Co., Ltd product);
Described zinc-plated, in being the chloride type bright galvanization liquid of 5-6.5, PH carries out, earlier with normal current density 1.5-3.5 heavy current impact plating 0.5-1.5min doubly, subsequently with 1-4A/dm
2Normal current density, being plating to thickness of coating is 5-20um;
Described reprocessing comprises:
(1) in the 1-5%(volume ratio) bright dipping 10-30sec in the nitric acid;
(2) containing the 2-3%(volume ratio) the magnificent electroplating technology in PP3000(Shenzhen Co., Ltd produces) zinc-plated trivalent chromium blue inactivating solution in passivation 10-30sec, form chromate passivation film;
(3) alternately clean with the hot water or cold water after the passivation, in 50-80 ℃ of hot water, soak 20-40min then;
(4) under 50-80 ℃, bake 0.5-2h.
In electro-plating method of the present invention, the dish washing detergent that ultrasonic oil removing is used comprises:
Goldfish board dish detergent (Beijing No.2 Daily-use Chemical Factory's product), white cat board liquid detergent (Shanghai Synthetic Detergents Factory's product), Da Ermei liquid detergent (Shanghai synthetic detergent five factories product), Gao Fuli liquid detergent (Guangzhou oil chemistry industrial group product).The cleaning agent of used wet oil amphiphilic solvent, surfactant, corrosion inhibiter, promoter comprises: ND-150 cleaning agent (Hua Yangensai of Daliang City Co., Ltd product) the water base industrial cleaning agent of LH (Beijing six directions meticulous detergent factory produce), and it is preferable that ultrasonic to remove oil solution be dish washing detergent; The ND-150 cleaning agent: water is 3-10: 3-10: the solution 100(volume ratio) or 5-10%(volume ratio) the water base industrial cleaning agent of LH, with time of its oil removing be 0.5-1h.
Pure water soaking step in the preliminary treatment is good to carry out 10min in 15-20 ℃ distilled water.
Activation step is good to carry out 2sec in the solution that contains 20g/l UV345 activator.
Zinc-plated step is carried out to good in the barrel plating mode.
Plating bath is the chloride type galvanizing flux that contains brightener.Preferable brightener is selected from BZ-11(Shanxi Province Wenxi County's chemical reagent factory and produces) and chlorine zinc-No. 1 (Wuhan electroplating technology development company product).Wherein better with chlorine zinc-No. 1 brightener again.
During plating, preferably doubly carry out strike plating, last 0.5-1min to the big electric current of normal current density with 2-3.
Bright dipping step described in the reprocessing is preferentially selected the 2-3%(volume ratio for use) nitric acid, last 10-15sec.
Passivation step described in the reprocessing is good to carry out 15-20sec.
The step of hot-water soak described in the reprocessing is being good with 60-70 ℃ of hot-water soak 25-35min.
That carries out at last in the reprocessing bakes, and is preferably in to carry out 1h under 60-70 ℃.
The clock step motor rotor neodymium iron boron Zn-plated magnetic ring that makes with electro-plating method of the present invention, antiseptic property meets among the GB6045-85 the constant damp and hot requirement of pointer quartz table, and meets the neutral salt spray test requirement that GB4035-83 tests to the electroplated component antiseptic property.
With the clock step motor rotor magnetic Nd-Fe-B ring that electro-plating method of the present invention makes, the adhesion performance meets following requirement: product by heating to 200 ℃ insulation 1h, take out the water of putting into room temperature immediately, and observe no bubbling and peeling phenomenon then at 30 * microscopically.
Following enforcement is intended to further describe in detail the present invention, but is not used for limiting the scope of the invention.
Embodiment 1:
To close 38%Nd, 60%Fe reaches＜the 2%B(weight ratio) all the other are the alloy of trace element, being processed into external diameter with machine-tooled method is 1.25mm, internal diameter is 0.30mm, thickness is the quartz watch step motor rotor magnet ring of 0.5mm, magnet ring is placed the aqueous solution of goldfish liquid detergent (Beijing No.2 Daily-use Chemical Factory's product) and each 30ml/l of ND-150 cleaning agent (Dalian Hua Yangensai Co., Ltd product), carry out ultrasonic oil removing, last 0.5h.Oil removing is finished, and water cleans.At room temperature carry out ultra-sonic dehydration again, last 0.5h with absolute ethyl alcohol.Then, magnet ring is soaked in the room temperature distilled water lasts 10min, place the activating solution that contains 20g/l UV345 activator immediately, activation 2sec, water cleans laggard electroplating, and the composition and the process conditions of used electroplate liquid are as follows:
ZnCl
280g/l
KCl 200g/l
H
3Bo
320g/l
BZ-11 brightener (Wenxi County, Shanxi chemical reagent factory product) 10ml/l
PH 6
20 ℃ of temperature
Plating is carried out in the barrel plating mode.Earlier with 6A/dm
2Current density impact 30sec, again with 3A/dm
2Carrying out 30min normally electroplates.Gained coating is about 6um.Plating is finished after washing, in the 3%(volume ratio) HNO
3Bright dipping 12sec in the solution after the washing, is containing the 3%(volume ratio) the magnificent electroplating technology in PP3000(Shenzhen Co., Ltd produces) the aqueous solution in passivation 15sec, after the hot water or cold water alternately cleans, in about 65 ℃ of hot water, soak 30min.At last, place 70 ℃ of air dry ovens to bake 1h.
Above-mentioned surface treatment is to shown in the following tabulation 1 of the influence of magnetic property:
Table 1 electroplating processes influences magnetic property
| Sample state surface magnetic flux density (3) magnetic attenuation rate (2) |
| 30.2mT before handling-processing back 29.8mT 1.3% handles the back and places 2 years (1) 29.2mT 3.3% |
Annotate: (1) placement condition is the often wet indoor conditions of normal temperature and pressure.
(2) be criterion calculation with the surface induction intensity before handling.
(3) 20 samples are averaged.
By data shown in the table 1 as seen, be as the criterion after the processing in the surface induction intensity after handling, the magnetic attenuation rate of placing 2 years only is 2%.
Embodiment 2
(external diameter is 1.25mm to sample, internal diameter is 0.30mm, thickness 0.50mm) with embodiment 1, magnet ring placed contains the 6%(volume ratio) aqueous solution of the water base industrial cleaning agent of LH, carry out ultrasonic oil removing, last 0.5h, oil removing is finished, and water cleans, at room temperature carry out ultra-sonic dehydration again with absolute ethyl alcohol, last 0.5h, follow, magnet ring is soaked in the room temperature distilled water lasts 10min, place the activating solution that contains 20g/l UV345 activator immediately, activation 2sec, water cleans laggard electroplating, and the composition and the process conditions of all electroplate liquids are as follows:
ZnCl
280g/l
KCl 200g/l
H
3BO
320g/l
Chlorine zinc-No. 1 brightener (Wuhan electroplating technology development company product) 12ml/l
PH 6
25 ℃ of temperature
Plating is carried out in the barrel plating mode.Earlier with 6A/dm
2Impact 30sec, again with 3A/dm
2Current density normally electroplate 40min, the thick 8um that is about of coating, plating is finished through water and is cleaned, in the 3%(volume ratio) HNO
3Bright dipping 12sec in the aqueous solution after the washing, is containing the 3%(volume ratio) the magnificent electroplating technology in PP3000(Shenzhen Co., Ltd produces) the aqueous solution in passivation 15sec, after the hot water or cold water alternately cleans, in about 70 ℃ of hot water, soak 30min, last, place 65 ℃ of air dry ovens to bake 1h.
Above-mentioned surface treatment is roughly described with embodiment 1 to the magnetic property influence.
Embodiment 3
Test procedure is with embodiment 1, but the composition of used galvanizing flux and process conditions are as follows:
ZnCl
270g/l
NaCl 200g/l
H
3BO
330g/l
Chlorine zinc-No. 1 brightener 15ml/l
PH 5.8
25 ℃ of temperature
Plating is carried out in the barrel plating mode, uses 8A/dm earlier
2Current density is impacted 30sec, then, and with 4A/dm
2Normally electroplate 30min, the gained thickness of coating is about 7um.All the other are with embodiment 1.
Above-mentioned electroplating processes roughly is same as embodiment 1 to the influence of magnetic property.
Claims (13)
1, clock step motor rotor neodymium iron boron Zn-plated magnetic ring, the structure that it is characterized in that described magnet ring comprises the magnet ring made from neodymium iron boron powder metallurgical alloy material, be plated on the lip-deep electro-galvanized layer of this magnet ring, and on this zinc laminar surface, form the chromating layer; The magnetic attenuation rate is that the magnetic attenuation rate is 1% to 6% in 1-6%, 2-5 operating period due to its electroplating processes.
2, the described neodymium iron boron Zn-plated magnetic ring of claim 1 is characterized in that, the magnetic attenuation rate is 1-3% due to its electroplating processes, and the magnetic attenuation rate in the described operating period is 1% to 3%.
3, the electro-plating method of clock step motor rotor neodymium iron boron Zn-plated magnetic ring, is characterized in that described preliminary treatment comprises comprising preliminary treatment, activation, zinc-plated and reprocessing:
(1) in the aqueous solution of the cleaning agent that contains dish washing detergent and/or wet oil amphiphilic solvent, surfactant, corrosion inhibiter, promoter, under 20-50 ℃, the processing magnet ring is carried out ultrasonic oil removing, wash with water then;
(2) carry out ultra-sonic dehydration with absolute ethyl alcohol at normal temperatures, last 0.5-1h;
(3) in 10-30 ℃ of pure water, soak 5-15min;
Described activation is carried out 1-10sec in the normal-temperature water solution that contains 15-50g/l UV345 metal activation agent (the magnificent electroplating technology in Shenzhen Co., Ltd product);
Described zinc-plated, in being the chloride type bright galvanization liquid of 5-6.5, PH carries out, earlier with normal current density 1.5-3.5 heavy current impact 0.5-1.5min doubly, subsequently with 1-4A/dm
2Normal current density, being plating to thickness of coating is 5-20um;
Described reprocessing comprises:
(1) in the 1-5%(volume ratio) bright dipping 10-30sec in the nitric acid;
(2) containing the 2-2%(volume ratio) the magnificent electroplating technology in PP3000(Shenzhen Co., Ltd produces) zinc-plated trivalent chromium blue inactivating solution in passivation, form chromate passivation film;
(3) alternately clean with the hot water or cold water after the passivation, in 50-80 ℃ of hot water, soak 20-40min then;
(4) under 50-80 ℃, cure 0.5-2h.
4, the described electro-plating method of claim 3 is characterized in that, the ultrasonic oil removing in the preliminary treatment is carried out 0.5-1h in the aqueous solution of the cleaning agent of dish washing detergent and/or wet oil amphiphilic solvent, surfactant, corrosion inhibiter, promoter.
5, the described electro-plating method of claim 3 is characterized in that pure water soaking step in the preliminary treatment, carries out in 15-20 ℃ of distilled water, lasts 10min.
6, the described electro-plating method of claim 3 is characterized in that described activation step, carries out 2sec in the aqueous solution that contains the agent of 20g/l UV345 metal activation.
7, the described electro-plating method of claim 3 is characterized in that described zinc-plated step carries out with the barrel plating method, and used brightener selects for use BZ-11(Shanxi Province Wenxi County's chemical reagent factory to produce in the plating bath) and No. one, chlorine zinc (Wuhan electroplating technology development company product).
8, the described electro-plating method of claim 7 is characterized in that the brightener that uses in the galvanizing flux is chlorine zinc-No. 1.
9, the described electro-plating method of claim 3 when it is characterized in that electroplating, doubly carries out strike plating 0.5-1min to the big electric current of normal current density with 2-3 earlier.
10, the described electro-plating method of claim 3 is characterized in that the bright dipping step described in the reprocessing, in the 2-3%(volume ratio) carry out 10-15sec in the salpeter solution.
11, the described electro-plating method of claim 3, the time that it is characterized in that passivation described in the reprocessing is 15-20sec.
12, the described electro-plating method of claim 3 is characterized in that the hot-water soak step of carrying out after the passivation in the reprocessing, and used water temperature is 60-70 ℃, and soak time is 25-35min.
13, the described electro-plating method of claim 3, final step is cured and carry out 1h under 60-70 ℃ in it is characterized in that handling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101307 CN1022075C (en) | 1992-03-06 | 1992-03-06 | Nd-Fe-B-Zn-plated magnetic ring of clock step motor and its electroplating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92101307 CN1022075C (en) | 1992-03-06 | 1992-03-06 | Nd-Fe-B-Zn-plated magnetic ring of clock step motor and its electroplating method |
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| Publication Number | Publication Date |
|---|---|
| CN1064374A true CN1064374A (en) | 1992-09-09 |
| CN1022075C CN1022075C (en) | 1993-09-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92101307 Expired - Fee Related CN1022075C (en) | 1992-03-06 | 1992-03-06 | Nd-Fe-B-Zn-plated magnetic ring of clock step motor and its electroplating method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073851A (en) * | 2014-06-20 | 2014-10-01 | 中磁科技股份有限公司 | Electrogalvanizing process for neodymium-iron-boron permanent-magnet material |
| CN106521586A (en) * | 2016-11-28 | 2017-03-22 | 宁波韵升股份有限公司 | Electrogalvanizing method of neodymium iron boron magnet |
| CN109518239A (en) * | 2018-12-25 | 2019-03-26 | 宁波韵升股份有限公司 | A kind of electro-plating method of sintered neodymium iron boron material |
-
1992
- 1992-03-06 CN CN 92101307 patent/CN1022075C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104073851A (en) * | 2014-06-20 | 2014-10-01 | 中磁科技股份有限公司 | Electrogalvanizing process for neodymium-iron-boron permanent-magnet material |
| CN106521586A (en) * | 2016-11-28 | 2017-03-22 | 宁波韵升股份有限公司 | Electrogalvanizing method of neodymium iron boron magnet |
| CN109518239A (en) * | 2018-12-25 | 2019-03-26 | 宁波韵升股份有限公司 | A kind of electro-plating method of sintered neodymium iron boron material |
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| Publication number | Publication date |
|---|---|
| CN1022075C (en) | 1993-09-08 |
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