CN102115899B - Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same - Google Patents

Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same Download PDF

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CN102115899B
CN102115899B CN201010033737.5A CN201010033737A CN102115899B CN 102115899 B CN102115899 B CN 102115899B CN 201010033737 A CN201010033737 A CN 201010033737A CN 102115899 B CN102115899 B CN 102115899B
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permanent magnet
tin
grams per
per liter
nickel alloy
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CN102115899A (en
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王彦红
潘广麾
胡振辉
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北京中科三环高技术股份有限公司
天津三环乐喜新材料有限公司
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Abstract

The invention provides a tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and a method for plating neodymium iron boron permanent magnet material by adopting the same. The method for plating neodymium iron boron permanent magnet material comprises the following steps of: polishing the surface of the neodymium iron boron permanent magnet material through mechanical vibration grinding; degreasing and deoiling the polished neodymium iron boron permanent magnet material with a mixed degreasing fluid of sodium phosphate, sodium phosphate and sodium hydroxide; pickling and derusting the neodymium iron boron permanent magnet material with a salpeter solution; activating the pickled neodymium iron boron permanent magnet material with a sulfuric acid solution; and plating a tin-nickel alloy film on the activated neodymium iron boron permanent magnet material in a tin-nickel alloy plating solution. The method for plating neodymium iron boron permanent magnet material not only can reduce the thickness of the plated film, but also can greatly improve the corrosion resistance of the neodymium iron boron permanent magnet material.

Description

For tin-nickel alloy plating solution and this plating solution of employing, electric plating method is carried out to Nd-Fe-Bo permanent magnet material

Technical field

The present invention relates to a kind of surface treatment method, particularly a kind of tin-nickel alloy plating solution for electroplating Nd-Fe-Bo permanent magnet material, and adopt tin-nickel alloy plating solution Nd-Fe-Bo permanent magnet material to be carried out to the method for eleetrotinplate nickelalloy.

Background technology

Nd-Fe-Bo permanent magnet material is a kind of sintered magnetic material, and it forms a large amount of pores on surface in the process of sinter molding, and these pores add the difficulty of follow-up plating.These pores can cause electroplating rear matrix and cannot penetrate in pore in conjunction with bad, electroplating solution with coating, and cause pore place coating to be put up a bridge, have a strong impact on the quality of neodymium-iron-boron permanent magnetic material surface process, and then have impact on the corrosion resistance nature of Nd-Fe-Bo permanent magnet material.Nd-Fe-Bo permanent magnet material is as the magnetic king in magneticsubstance, and its character is very active, is easy to, by the acid and alkali corrosion in the external world, lose magnetism.So the quality of neodymium-iron-boron permanent magnetic material surface process is directly connected to work-ing life and the performance of Nd-Fe-Bo permanent magnet material.

At present, the anti-corrosion method of Nd-Fe-Bo permanent magnet material has a lot.Such as, publication number is that the Chinese invention patent application of CN1058053A discloses a kind of method of Nd-Fe-B alloys being carried out to electronickelling, the method is for carry out surface degreasing by Nd-Fe-B alloys matrix degreaser, after washing, immerse in aqueous hydrochloric acid, after washing, put into basic solution again, then be reentered in aqueous hydrochloric acid after washing, then put into plating solution and electroplate after washing.This application just general be referred to the corrosion resistance nature that the method provided by it can improve Nd-Fe-B alloys, and do not provide any corrosion resistance nature data.

Publication number is that the Chinese invention patent application of CN 1448544A discloses a kind of neodymium-iron-boron permanent magnetic material surface guard technology, this technology adopts material surface electronickelling technology, in pre-treating technology, adopt material surface hole sealing technology, in plating technology, adopt neutral plating solution plating Composite Plating of plating 1-3 hour in acidic bath immediately after 20-30 minute.Because the method needs first to electroplate neutral nickel, and then electroplate acid nickel, therefore complex process.

Chinese patent application CN 1058053A and CN 1448544A is incorporated to the present invention as a reference at this.

And we know, Nd-Fe-Bo permanent magnet material is applied in such as air conditioner motor, electric motor of automobile or elevator motor etc. usually, and all have to face high temperature and moistening environment, also may be applied in the moisture containing salinity sometimes.Therefore, require that Nd-Fe-Bo permanent magnet material has higher solidity to corrosion.

Summary of the invention

One object of the present invention there are provided a kind of tin-nickel alloy plating solution for electroplating Nd-Fe-Bo permanent magnet material, and described tin-nickel alloy plating solution comprises: tin protochloride 20 ~ 40 grams per liter, Nickel dichloride hexahydrate 20 ~ 40 grams per liter, potassium pyrophosphate 180 ~ 220 grams per liter, ammoniacal liquor 4 ~ 8ml/L, Padil 15 ~ 25 grams per liter, complexing agent 2 ~ 6 grams per liter.Wherein, described complexing agent is quadrol.

Another object of the present invention there are provided a kind of method of neodymium-iron boron permanent magnetic material electroplating tin-nickel alloy, said method comprising the steps of:

(1) chamfering polishing: adopt mechanical vibration to polish neodymium-iron-boron permanent magnetic material surface;

(2) degreasing degreasing: use sodium phosphate, sodium carbonate and sodium hydroxide mixed defatting liquid to carry out degreasing degreasing to grinded Nd-Fe-Bo permanent magnet material;

(3) acid pickling and rust removing: use salpeter solution to carry out acid pickling and rust removing to Nd-Fe-Bo permanent magnet material;

(4) acid solution activation: use sulphuric acid soln to activate the Nd-Fe-Bo permanent magnet material after pickling;

(5) zinc-plated nickelalloy film forming: in tin-nickel alloy plating solution, zinc-plated nickelalloy film forming is carried out to the Nd-Fe-Bo permanent magnet material after activation, wherein, described tin-nickel alloy plating solution comprises: tin protochloride 20 ~ 40 grams per liter, Nickel dichloride hexahydrate 20 ~ 40 grams per liter, potassium pyrophosphate 180 ~ 220 grams per liter, ammoniacal liquor 4 ~ 8ml/L, Padil 15 ~ 25 grams per liter and complexing agent 2 ~ 6 grams per liter; Preferably, described complexing agent is quadrol.

(6) aftertreatment: use the coating after hole sealing agent process plating.Preferably, described encapsulant is the agent of water-based nickel plating enclosure.The thickness of described coating is 12 ~ 18 microns.

Preferably, when electroplating, the temperature of described tin-nickel alloy plating solution is 45 ~ 55 DEG C, and pH is 7.5 ~ 8.5, and current density is 0.5 ~ 1.5A/dm 2.

Preferably, three road washed with de-ionized water coating will be used before sealing of hole.

Preferably, described Nd-Fe-Bo permanent magnet material is sintered NdFeB

Preferably, in the aftertreatment of use hole sealing agent, the salt fog performance of coating is more than 240 hours.

According to method provided by the present invention, first adopt conventional mechanical vibration to polish neodymium-iron-boron permanent magnetic material surface, be conducive to coating like this and be combined better with matrix.With sodium phosphate, sodium carbonate and sodium hydroxide, conventional degreasing degreasing is carried out to grinded Nd-Fe-Bo permanent magnet material subsequently.In order to remove the oxide compound of neodymium-iron-boron permanent magnetic material surface, with salpeter solution, conventional acid pickling and rust removing is carried out to Nd-Fe-Bo permanent magnet material.In acid pickling and rust removing, the nitric acid that best working concentration is lower, this is because the too high meeting of concentration of nitric acid causes pickling excessive, causes the magnetic property of Nd-Fe-Bo permanent magnet material to reduce; Concentration of nitric acid is too low, causes pickling insufficient, has influence on the effect that erosion resistance is improved.

After acid pickling and rust removing, clean Nd-Fe-Bo permanent magnet material with water, then carry out Conventional activation process with sulphuric acid soln to Nd-Fe-Bo permanent magnet material, this is pretreated final step, and the Nd-Fe-Bo permanent magnet material after activated can be electroplated.

The present invention uses tin-nickel alloy plating solution to electroplate Nd-Fe-Bo permanent magnet material, uses tin to replace part of nickel to reduce production cost.This tin-nickel alloy plating solution comprises tin protochloride 20 ~ 40 grams per liter, Nickel dichloride hexahydrate 20 ~ 40 grams per liter, potassium pyrophosphate 180 ~ 220 grams per liter, ammoniacal liquor 4 ~ 8ml/L, Padil 15 ~ 25 grams per liter and complexing agent 2 ~ 6 grams per liter, wherein add complexing agent and be conducive to the stable of plating solution, improve all platings and the covering power of plating solution, improve Deposit appearance simultaneously.

Method provided by the invention can also comprise post-processing step, namely carries out sealing pores to the Nd-Fe-Bo permanent magnet material after plating.Before carrying out sealing pores, first use deionized water to clean tin-nickel alloy coating, such cleaning at least carries out three times, only has and carries out cleaning guarantee sealing of hole effect to tin-nickel alloy coating.The porosity of coating can be reduce further through sealing pores, improve the salt fog performance of Nd-Fe-Bo permanent magnet material.

The method of neodymium-iron boron permanent magnetic material electroplating tin-nickel alloy provided by the present invention has the following advantages:

(1), compared with the method that the Chinese invention patent application being CN 1448544A with publication number provides, the method only to neodymium-iron boron permanent magnetic material electroplating one deck tin-nickel alloy, need decrease operation sequence, enhances productivity.

(2) tin-nickel alloy plating solution is used to electroplate Nd-Fe-Bo permanent magnet material, Nd-Fe-Bo permanent magnet material matrix forms tin-nickel alloy coating, that is tin is used to replace a part of nickel, so not only combine the advantage of tin, these two kinds of metals of nickel, and save expensive nickel metal, reduce production cost.

(3) use method provided by the invention, the thickness of coating can not only be reduced, and the corrosion resistance nature of Nd-Fe-Bo permanent magnet material can be improved.Generally, the coating of Nd-Fe-Bo permanent magnet material is thicker, and its corrosion resistance nature is better, but the metal used is also more, substantially increases cost.Compared with traditional nickel plating process, method provided by the invention is by using specific tin-nickel alloy plating solution, and the temperature of the current density controlled in electroplating process and tin-nickel alloy plating solution and pH, when thickness of coating is only 60 ~ 70% of traditional nickel plating thickness of coating, increase substantially the corrosion resistance nature of Nd-Fe-Bo permanent magnet material.Such as, in the disclosed method of document " neodymium iron boron magnetic body protection against corrosion research " (" magnetics and magneticsubstance collected works " magnetics in 2000 and magneticsubstance collected works (two) P89), thickness of coating reaches more than 20 microns, but the salt fog performance of Nd-Fe-Bo permanent magnet material is no more than 100 hours; And using method provided by the invention, thickness of coating is only 12 ~ 18 microns, and the salt fog performance of Nd-Fe-Bo permanent magnet material reaches more than 240 hours.

(4) method provided by the invention is by effective sealing of hole aftertreatment, reduce further the porosity of coating, improves the salt fog performance of Nd-Fe-Bo permanent magnet material.

(5) method provided by the invention is a kind of electroplating technology of alkaline non-cyanide, the plating solution environment-protecting asepsis used, plating solution to environment and equipment corrosion little, wastewater treatment is convenient.

The method that the application of the invention provides, the solidity to corrosion of Nd-Fe-Bo permanent magnet material can be significantly improved, prepared Nd-Fe-Bo permanent magnet material can be made like this to have use range widely, high temperature, the moistening environment such as air conditioner motor, electric motor of automobile or elevator motor can be applied to.Meanwhile, prepared Nd-Fe-Bo permanent magnet material is also made to have longer work-ing life.

Embodiment

For making your auditor can understand structure of the present invention, feature and other objects further, the appended preferred embodiment of existing combination is described in detail as follows, and illustrated preferred embodiment is only for illustration of technical scheme of the present invention, and non-limiting the present invention.

In the present invention, the Nd-Fe-Bo permanent magnet material used can be prepared by any method known to those skilled in the art.Such as, prepare alloy pig by certain alloy formula melting, and broken powder process is carried out to this alloy pig, and obtain pressed compact by shaping, subsequently pressed compact is sintered in vacuum sintering furnace, finally carry out the Nd-Fe-Bo permanent magnet material that temper obtains sintering.

Embodiment 1

The sintered Nd-Fe-B permanent magnetic material of 3 kilograms of D15*4 is polished 3 hours in vibrating ball mill.Use the grease-removing agent of 10L, it consists of sodium phosphate 30g/ liter, sodium carbonate 8g/ rises and sodium hydroxide 8g/ liter, after degreasing degreasing is carried out to Nd-Fe-Bo permanent magnet material, with the oxide compound of the salpeter solution pickling removing neodymium-iron-boron permanent magnetic material surface of 5%, then clean 3 times with water.With the sulphuric acid soln of 5%, Nd-Fe-Bo permanent magnet material is activated again, electroplate subsequently, Nd-Fe-Bo permanent magnet material complete for above-mentioned pre-treatment is put into tin-nickel alloy plating solution, consisting of of this tin-nickel alloy plating solution: tin protochloride 20 grams per liter, Nickel dichloride hexahydrate 20 grams per liter, potassium pyrophosphate 180 grams per liter, ammoniacal liquor 4ml/L, Padil 15 grams per liter, complexing agent quadrol are 2 grams per liters.When electroplating, the temperature of tin-nickel alloy plating solution is 45 DEG C, pH is 7.5, and current density is 0.5A/dm 2, electroplating time is 200min.After plating terminates, the thickness of tin-nickel alloy coating is 18 microns.With washed with de-ionized water tin-nickel alloy coating three times, then Nd-Fe-Bo permanent magnet material is crossed hole sealing agent and is carried out sealing of hole, dries up the moisture of neodymium-iron-boron permanent magnetic material surface, finally in the baking oven of 100 DEG C, dry 20min after sealing of hole with blower.Wherein, the hole sealing agent used is the NF1080 water-based nickel plating enclosure agent of being produced by Guangzhou Tianzhi Environmental Protection Science and Technology Co., Ltd..

Embodiment 2

The sintered Nd-Fe-B permanent magnetic material of 3 kilograms of D15*4 is polished 3 hours in vibrating ball mill.Use the grease-removing agent of 10L, it consists of sodium phosphate 30g/ liter, sodium carbonate 8g/ rises and sodium hydroxide 8g/ liter, after degreasing degreasing is carried out to Nd-Fe-Bo permanent magnet material, with the oxide compound of the salpeter solution pickling removing neodymium-iron-boron permanent magnetic material surface of 5%, then clean 3 times with water.With the sulphuric acid soln of 5%, Nd-Fe-Bo permanent magnet material is activated again, electroplate subsequently, Nd-Fe-Bo permanent magnet material complete for above-mentioned pre-treatment is put into tin-nickel alloy plating solution, consisting of of this tin-nickel alloy plating solution: tin protochloride 30 grams per liter, Nickel dichloride hexahydrate 30 grams per liter, potassium pyrophosphate 200 grams per liter, ammoniacal liquor 6ml/L, Padil 20 grams per liter, complexing agent quadrol 4 grams per liter.When electroplating, the temperature of tin-nickel alloy plating solution is 50 DEG C, pH is 8.0, and current density is 1A/dm 2, electroplating time is 100min.After plating terminates, the thickness of tin-nickel alloy coating is 15 microns.With washed with de-ionized water tin-nickel alloy coating three times, then Nd-Fe-Bo permanent magnet material is crossed pore-sealing liquid and is carried out sealing of hole, dries up the moisture of neodymium-iron-boron permanent magnetic material surface, finally in the baking oven of 100 DEG C, dry 20min after sealing of hole with blower.Wherein, the hole sealing agent used is the NF1080 water-based nickel plating enclosure agent of being produced by Guangzhou Tianzhi Environmental Protection Science and Technology Co., Ltd..

Embodiment 3

The sintered Nd-Fe-B permanent magnetic material of 3 kilograms of D15*4 is polished 3 hours in vibrating ball mill.Use the grease-removing agent of 10L, it consists of sodium phosphate 30g/ liter, sodium carbonate 8g/ rises and sodium hydroxide 8g/ liter, after degreasing degreasing is carried out to Nd-Fe-Bo permanent magnet material, with the oxide compound of the salpeter solution pickling removing neodymium-iron-boron permanent magnetic material surface of 5%, then clean 3 times with water.With the sulphuric acid soln of 5%, Nd-Fe-Bo permanent magnet material is activated again, electroplate subsequently, Nd-Fe-Bo permanent magnet material complete for above-mentioned pre-treatment is put into tin-nickel alloy plating solution, consisting of of this tin-nickel alloy plating solution: when tin protochloride 40 grams per liter, Nickel dichloride hexahydrate 40 grams per liter, potassium pyrophosphate 220 grams per liter, ammoniacal liquor 8ml/L, Padil 25 grams per liter, complexing agent quadrol 6 grams per liter are electroplated, the temperature of tin-nickel alloy plating solution is 55 DEG C, pH is 8.5, and current density is 1.5A/dm 2, electroplating time is 60min.After plating terminates, the thickness of tin-nickel alloy coating is 12 microns.With washed with de-ionized water tin-nickel alloy coating three times, then Nd-Fe-Bo permanent magnet material is crossed pore-sealing liquid and is carried out sealing of hole, dries up the moisture of neodymium-iron-boron permanent magnetic material surface, finally in the baking oven of 100 DEG C, dry 20min after sealing of hole with blower.Wherein, the hole sealing agent used is the NF1080 water-based nickel plating enclosure agent of being produced by Guangzhou Tianzhi Environmental Protection Science and Technology Co., Ltd..

Comparative example 1

The sintered Nd-Fe-B permanent magnetic material of 3 kilograms of D15*4 is polished 3 hours in vibrating ball mill.Use the grease-removing agent of 10L, it consists of sodium phosphate 30g/ liter, sodium carbonate 8g/ rises and sodium hydroxide 8g/ liter, after degreasing degreasing is carried out to Nd-Fe-Bo permanent magnet material, with the oxide compound of the salpeter solution pickling removing neodymium-iron-boron permanent magnetic material surface of 5%, then clean 3 times with water.With the sulphuric acid soln of 5%, Nd-Fe-Bo permanent magnet material is activated again, electroplate subsequently, Nd-Fe-Bo permanent magnet material complete for above-mentioned pre-treatment is put into a watt nickel solution, consisting of of this watt of nickel plating bath: single nickel salts 200 grams per liter, Nickel dichloride hexahydrate 40 grams per liter, boric acid 50 grams per liter, wetting agent sodium lauryl sulphate 0.2 grams per liter, the temperature of plating solution is 50 DEG C, pH value is 4.0, and current density is 1.0A/dm 2, electroplating time is 100min.The thickness of coating is 25 microns.With washed with de-ionized water workpiece three times, then Nd-Fe-Bo permanent magnet material is crossed pore-sealing liquid and is carried out sealing of hole, dries up the moisture of neodymium-iron-boron permanent magnetic material surface, finally in the baking oven of 100 DEG C, dry 20min after sealing of hole with blower.Wherein, the hole sealing agent used is the NF1080 water-based nickel plating enclosure agent of being produced by Guangzhou Tianzhi Environmental Protection Science and Technology Co., Ltd..

File is tested

Each 100 of the Nd-Fe-Bo permanent magnet material of the Nd-Fe-Bo permanent magnet material of the eleetrotinplate nickelalloy prepared by Example 1-3 and the electronickelling prepared by comparative example 1 carries out file experiment.Experimental technique is as follows: by clamping for Nd-Fe-Bo permanent magnet material sample platform tiger fixed after, with the edge of file filing sample, file face and sample coating surface are 45 °, file from matrix metal to coating direction.After repetition aforesaid operations 5 times, observe the position of filing, the coating of specimen surface is qualified not leave matrix metal, otherwise is defective, and file experimental result is listed in table 1.

Table 1

Example Experimental quantities Qualified quantity Example 1 100 100 Example 2 100 100 Example 3 100 100 Comparison example 1 100 80

High temperature and pressure test and salt-fog test

Each 100 of the Nd-Fe-Bo permanent magnet material of the Nd-Fe-Bo permanent magnet material of the eleetrotinplate nickelalloy prepared by Example 1-3 and the electronickelling prepared by comparative example 1 carries out high temperature and pressure test.The condition of high temperature and pressure test is: container pressure 2 normal atmosphere, vessel temp 120 DEG C, humidity is 100%.Experimental installation is the High Temperature High Pressure senile experiment case that Hong Yu instrument Science and Technology Co., Ltd. produces, and model is PCT-35.The judging criterion of high temperature and pressure test is: coating is without cracking, peeling, and surface is without red rust.The results are shown in Table 2 for high temperature and pressure test.

Each 100 of the Nd-Fe-Bo permanent magnet material of the Nd-Fe-Bo permanent magnet material of the eleetrotinplate nickelalloy prepared by Example 1-3 and the electronickelling prepared by comparative example 1 carries out salt-fog test.The condition of salt-fog test is: brine concentration 5%, salt fog the temperature inside the box are 35 DEG C, and pressure pot temperature is 47 DEG C, and spray pattern is spraying continuously.Experimental installation is the accurate salt spray tester that Qingdao Sol experimental installation company limited produces.The judging criterion of salt-fog test is: coating surface is without red rust.The results are shown in Table 2 for salt-fog test.

Table 2 shows the high temperature and pressure test of Nd-Fe-Bo permanent magnet material and the result of salt-fog test of the eleetrotinplate nickelalloy of embodiment 1-3 and the electronickelling of comparative example 1:

Table 2

Example High temperature and pressure test/hour Salt-fog test/hour Embodiment 1 ＞96 ＞240 Embodiment 2 ＞96 ＞240 Embodiment 3 ＞96 ≥240 Embodiment 4 ≤72 ≤100

It is to be understood that foregoing invention content and embodiment are intended to the practical application proving technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art in spirit of the present invention and principle, when doing various amendment, equivalent replace or improve.Protection scope of the present invention is as the criterion with appended claims.

Claims (6)

1. one kind for electroplating the tin-nickel alloy plating solution of Nd-Fe-Bo permanent magnet material, it is characterized in that, described tin-nickel alloy plating solution comprises: tin protochloride 20 ~ 40 grams per liter, Nickel dichloride hexahydrate 20 ~ 40 grams per liter, potassium pyrophosphate 180 ~ 220 grams per liter, ammoniacal liquor 4 ~ 8ml/L, Padil 15 ~ 25 grams per liter, complexing agent 2 ~ 6 grams per liter, described complexing agent is quadrol.
2. a method for neodymium-iron boron permanent magnetic material electroplating tin-nickel alloy, is characterized in that, said method comprising the steps of:
(1) chamfering polishing: adopt mechanical vibration to polish neodymium-iron-boron permanent magnetic material surface;
(2) degreasing degreasing: use sodium phosphate, sodium carbonate and sodium hydroxide mixed defatting liquid to carry out degreasing degreasing to grinded Nd-Fe-Bo permanent magnet material;
(3) acid pickling and rust removing: use salpeter solution to carry out acid pickling and rust removing to Nd-Fe-Bo permanent magnet material;
(4) acid solution activation: use sulphuric acid soln to activate the Nd-Fe-Bo permanent magnet material after pickling;
(5) zinc-plated nickelalloy film forming: in tin-nickel alloy plating solution, zinc-plated nickelalloy film forming is carried out to the Nd-Fe-Bo permanent magnet material after activation, when electroplating, the temperature of described tin-nickel alloy plating solution is 45 ~ 55 DEG C, and pH is 7.5 ~ 8.5, and current density is 0.5 ~ 1.5A/dm 2wherein, described tin-nickel alloy plating solution comprises: tin protochloride 20 ~ 40 grams per liter, Nickel dichloride hexahydrate 20 ~ 40 grams per liter, potassium pyrophosphate 180 ~ 220 grams per liter, ammoniacal liquor 4 ~ 8ml/L, Padil 15 ~ 25 grams per liter and complexing agent 2 ~ 6 grams per liter, and described complexing agent is quadrol;
(6) aftertreatment: use the coating after encapsulant process plating, the thickness of described coating is 12 ~ 18 microns.
3. method according to claim 2, is characterized in that, described encapsulant is the agent of water-based nickel plating enclosure.
4. method according to claim 2, is characterized in that, will use three road washed with de-ionized water coating before sealing of hole.
5. the method according to any one of claim 2 ~ 4, is characterized in that, described Nd-Fe-Bo permanent magnet material is sintered NdFeB.
6. the method according to any one of claim 2 ~ 4, is characterized in that, in the aftertreatment of use hole sealing agent, the salt fog performance of coating is more than 240 hours.
CN201010033737.5A 2010-01-05 2010-01-05 Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same CN102115899B (en)

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