CN105220194A - A kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product - Google Patents

A kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product Download PDF

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CN105220194A
CN105220194A CN201510671499.3A CN201510671499A CN105220194A CN 105220194 A CN105220194 A CN 105220194A CN 201510671499 A CN201510671499 A CN 201510671499A CN 105220194 A CN105220194 A CN 105220194A
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nickel
thin slice
magnet steel
iron boron
neodymium iron
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CN201510671499.3A
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Chinese (zh)
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陈久扬
许式袍
杨江华
黄昌菊
孙王杰
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宁波韵升磁体元件技术有限公司
宁波韵升股份有限公司
宁波韵升特种金属材料有限公司
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Priority to CN201510671499.3A priority Critical patent/CN105220194A/en
Publication of CN105220194A publication Critical patent/CN105220194A/en

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Abstract

The invention discloses a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product, successively by nickel preplating process, plate half light nickel process and bright nickel plating process, in nickel preplating treating processes, adopt dual-pulse power supply, and dual-pulse power supply uses higher current density, after nickel preplating process, the surface formation density of neodymium iron boron thin slice magnet steel product is large thus, hardness is high, low and the nickel preplating coating that homogeneity is high of porosity, in follow-up plating half light nickel treating processes, half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water form according to specific proportioning, half light nickel solution unresolvable tartaric acid potassium sodium is as coordination agent, ammonium sulfate is as conducting salt, improve the homogeneity of half light nickel coating, finally on half light nickel coating, generate the high bright nickel layer of homogeneity, advantage is that nickel layer is made up of pre-nickel plating, half light nickel dam and the bright nickel layer that homogeneity is high, greatly improves neodymium iron boron thin slice magnet steel product coating distributing homogeneity.

Description

A kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product
Technical field
The present invention relates to a kind of method for electroplating nickel, especially relate to a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product.
Background technology
Nd-Fe-Bo permanent magnet material is the powdered material that a kind of chemically reactive is strong, and its characteristic is hard and crisp, easy oxidized corrosion, and the Corrosion Protection of the neodymium-iron-boron product made from steel adopting Nd-Fe-Bo permanent magnet material to be prepared from thus is poor.At present, the most effective anti-corrosion method that neodymium-iron-boron product made from steel is taked is exactly adopt surface treatment method to form protective layer on the surface of neodymium-iron-boron product made from steel.The deteriorated layer that surface due to neodymium-iron-boron product made from steel produces when there is ground finish, the densification not exclusively emptying aperture produced and be oxidized equal, its process of surface treatment generally includes necessary pre-treatment and suitable electroplating technology.Electronickelling crystallization is extremely tiny; and there is excellent polishing performance; nickel coating through polishing can obtain the lustrous appearance as minute surface; can keep its gloss for a long time in an atmosphere, the surface treatment method of the thus domestic and international employing electronickelling more to neodymium-iron-boron product made from steel at present carries out surface protection simultaneously.But existing method for electroplating nickel has thickness thin (thickness≤1mm) being applied to process, during the neodymium iron boron thin slice magnet steel product of the features such as chamfer angle less (chamfer radius R≤0.2) and tolerance zone narrow (over/under tolerance≤0.010mm), power line too much can concentrate on neodymium iron boron thin slice magnet steel product edge and tip, usually there is " fringing effect " and " point effect ", make the coating at this place thicker compared with other positions, cause product end size and central point dimensional thickness difference excessive, cause coating distributing homogeneity bad thus, directly have influence on Total Product assembling.
In view of this, a kind of development of method for electroplating nickel to the process of surface treatment of neodymium iron boron thin slice magnet steel product that can improve the neodymium iron boron thin slice magnet steel product of neodymium iron boron thin slice magnet steel product coating distributing homogeneity is designed significant.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method for electroplating nickel that can improve the neodymium iron boron thin slice magnet steel product of neodymium iron boron thin slice magnet steel product coating distributing homogeneity.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product, comprises the following steps:
1. pre-treatment is carried out to neodymium iron boron thin slice magnet steel product;
2. nickel preplating process is carried out to neodymium iron boron thin slice magnet steel product: pre-nickel plating solution is by single nickel salt, boric acid, sodium isethionate, hydroxypropyl Sulfothiorine and water composition, the mass body volume concentrations of single nickel salt is 220 ~ 300 grams per liters, the mass body volume concentrations of boric acid is 30 ~ 50 grams per liters, the mass body volume concentrations of sodium isethionate is 10 ~ 25 mg/litre, the mass body volume concentrations of hydroxypropyl Sulfothiorine is 2 ~ 8 mg/litre, the nickel preplating treatment time is 3500 ~ 6500 seconds, dual-pulse power supply is adopted in nickel preplating treating processes, its forward current density is 0.2 ~ 0.8 ampere/square decimeter, reverse current density is 0.1 ~ 0.3 ampere/square decimeter, the forward conduction time is 10 ~ 20 seconds, the reverse-conducting time is 5 ~ 10 seconds, positive frequencies is 1 ~ 1.5kHz, reverse frequency is 0.1 ~ 0.5kHz, forward dutycycle is 50% ~ 70%, reverse dutycycle is 10% ~ 30%, the temperature of pre-nickel plating solution is 40 ~ 60 DEG C, pH value is 3.5 ~ 4.8,
3. adopt the neodymium iron boron thin slice magnet steel product of deionized water to nickel preplating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of nickel preplating process is cleaned up;
4. the process of plating half light nickel is carried out to neodymium iron boron thin slice magnet steel product: half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water composition, the mass body volume concentrations of single nickel salt is 100 ~ 200 grams per liters, the mass body volume concentrations of nickelous chloride is 20 ~ 40 grams per liters, the mass body volume concentrations of boric acid is 20 ~ 40 grams per liters, Seignette salt mass body volume concentrations is 40 ~ 70 grams per liters, trolamine mass body volume concentrations is 20 ~ 60 grams per liters, ammonium sulfate mass body volume concentrations is 10 ~ 50 grams per liters, ammoniacal liquor concentration of volume percent is 20 ~ 60 milliliters/liter, plating for half light nickel treatment time is 3500 ~ 5500 seconds, plate in half light nickel treating processes and adopt high-frequency direct-current power supply, its current density is 0.2 ~ 0.8 ampere/square decimeter, temperature is 40 ~ 60 DEG C, pH value is 4.8 ~ 6.5,
5. adopt the neodymium iron boron thin slice magnet steel product of deionized water to the process of plating half light nickel repeatedly to clean, the neodymium iron boron thin slice magnet steel product of plating half light nickel process is cleaned up;
6. bright nickel plating process is carried out to neodymium iron boron thin slice magnet steel product: bright nickel solution is by single nickel salt, nickelous chloride, boric acid, soluble saccharin and water composition, the mass body volume concentrations of single nickel salt is 200 ~ 300 grams per liters, the mass body volume concentrations of nickelous chloride is 30 ~ 60 grams per liters, the mass body volume concentrations of boric acid is 30 ~ 60 grams per liters, the mass body volume concentrations of soluble saccharin is 5 ~ 20 mg/litre, the bright nickel plating treatment time is 2500 ~ 4000 seconds, high-frequency direct-current power supply is adopted in bright nickel plating treating processes, its current density is 0.1 ~ 0.8 ampere/square decimeter, the temperature of bright nickel solution is 40 ~ 60 DEG C, pH value is 3.5 ~ 4.8,
7. adopt the neodymium iron boron thin slice magnet steel product of deionized water to bright nickel plating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of bright nickel plating process is cleaned up post-drying.
Described step 1. middle pre-treating technology comprises the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, neodymium iron boron thin slice magnet steel product is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 250 ~ 400 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 30 ~ 60 grams per liters, the mass body volume concentrations of sodium carbonate is 20 ~ 40 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 20 ~ 40 grams per liters, in electrolytic process, current density is 0.2 ~ 0.8 ampere/square decimeter, and electrolyte temperature is 30 ~ 60 DEG C;
1.-4 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after electrolysis, neodymium iron boron thin slice magnet steel product is cleaned up.
Compared with prior art, the invention has the advantages that in nickel preplating treating processes, adopt dual-pulse power supply, and dual-pulse power supply uses higher current density, the synthesis speed of nucleus in nickel preplating treating processes is made to be far longer than the growth velocity of original crystal, can at the careful nickel preplating coating of neodymium iron boron thin slice magnet steel product formation crystallization, simultaneously, in nickel preplating treating processes, the pulse of the pulse power is alternately opened according to the cycle and turns off, within the pulse-off phase, in cathode zone pre-nickel plating solution, the mass concentration of conductive ion can obtain rise in various degree, the resistivity of pre-nickel plating solution can reduce thus, in pre-nickel plating solution, the dispersing uniformity of conductive ion improves, improve the homogeneity of nickel preplating coating, after nickel preplating process, the surface formation density of neodymium iron boron thin slice magnet steel product is large thus, hardness is high, low and the nickel preplating coating that homogeneity is high of porosity, in follow-up plating half light nickel treating processes, half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water form according to specific proportioning, half light nickel solution unresolvable tartaric acid potassium sodium is as coordination agent, ammonium sulfate is as conducting salt, the polarization of half light nickel solution negative electrode in plating half light nickel treating processes can be increased thus and improve the electroconductibility of half light nickel solution, reduce the resistivity of half light nickel solution, improve the dispersive ability of conductive ion in half light nickel solution, improve the homogeneity of half light nickel coating, finally adopt by single nickel salt, nickelous chloride, boric acid, the bright nickel solution that soluble saccharin and water form according to specific proportioning carries out bright nickel plating process, half light nickel coating generates the high bright nickel layer of homogeneity, nickel layer final is thus by the high pre-nickel plating of homogeneity, half light nickel dam and bright nickel layer composition, greatly improve neodymium iron boron thin slice magnet steel product coating distributing homogeneity,
When step 1. in pre-treating technology comprise the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, neodymium iron boron thin slice magnet steel product is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 250 ~ 400 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 30 ~ 60 grams per liters, the mass body volume concentrations of sodium carbonate is 20 ~ 40 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 20 ~ 40 grams per liters, in electrolytic process, current density is 0.2 ~ 0.8 ampere/square decimeter, and electrolyte temperature is 30 ~ 60 DEG C;
1.-4 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after electrolysis, when neodymium iron boron thin slice magnet steel product is cleaned up, have the following advantages: in pickling, first adopt dilute nitric acid solution as pickle solution, dust technology can not cause damage to neodymium iron boron magnetic body structure, reduce pickling to the impact of magnetic property, then washing is adopted, electrolysis and the technique of again washing process neodymium iron boron magnetic body, greasy dirt and oxide on surface etc. that neodymium iron boron magnetic body adheres in former process can be removed, ensure that neodymium-iron-boron surface is in active condition before entering plating tank, there is good degree of cleaning and magnetic property.
Accompanying drawing explanation
Fig. 1 is the structural representation of neodymium iron boron thin slice magnet steel product in embodiments of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one: a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product, comprises the following steps:
1. neodymium iron boron thin slice magnet steel product carries out pre-treatment;
2. nickel preplating process is carried out to neodymium iron boron thin slice magnet steel product: pre-nickel plating solution is by single nickel salt, boric acid, sodium isethionate, hydroxypropyl Sulfothiorine and water composition, the mass body volume concentrations of single nickel salt is 220 grams per liters, the mass body volume concentrations of boric acid is 30 grams per liters, the mass body volume concentrations of sodium isethionate is 10 mg/litre, the mass body volume concentrations of hydroxypropyl Sulfothiorine is 2 mg/litre, the nickel preplating treatment time is 3500 seconds, dual-pulse power supply is adopted in nickel preplating treating processes, its forward current density is 0.2 ampere/square decimeter, reverse current density is 0.1 ampere/square decimeter, the forward conduction time is 10 seconds, the reverse-conducting time is 5 seconds, positive frequencies is 1kHz, reverse frequency is 0.1kHz, forward dutycycle is 50%, reverse dutycycle is 10%, the temperature of pre-nickel plating solution is 40 DEG C, pH value is 3.5,
3. adopt the neodymium iron boron thin slice magnet steel product of deionized water to nickel preplating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of nickel preplating process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
4. the process of plating half light nickel is carried out to neodymium iron boron thin slice magnet steel product: half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water composition, the mass body volume concentrations of single nickel salt is 100 grams per liters, the mass body volume concentrations of nickelous chloride is 20 grams per liters, the mass body volume concentrations of boric acid is 20 grams per liters, Seignette salt mass body volume concentrations is 40 grams per liters, trolamine mass body volume concentrations is 20 grams per liters, ammonium sulfate mass body volume concentrations is 10 grams per liters, ammoniacal liquor concentration of volume percent is 20 milliliters/liter, plating for half light nickel treatment time is 3500 seconds, plate in half light nickel treating processes and adopt high-frequency direct-current power supply, its current density is 0.2 ampere/square decimeter, temperature is 40 DEG C, pH value is 4.8,
5. adopt the neodymium iron boron thin slice magnet steel product of deionized water to the process of plating half light nickel repeatedly to clean, the neodymium iron boron thin slice magnet steel product of plating half light nickel process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
6. bright nickel plating process is carried out to neodymium iron boron thin slice magnet steel product: bright nickel solution is made up of single nickel salt, nickelous chloride, boric acid, soluble saccharin and water, the mass body volume concentrations of single nickel salt is 200 grams per liters, the mass body volume concentrations of nickelous chloride is 30 grams per liters, the mass body volume concentrations of boric acid is 30 grams per liters, the mass body volume concentrations of soluble saccharin is 5 mg/litre, the bright nickel plating treatment time is 2500 seconds, high-frequency direct-current power supply is adopted in bright nickel plating treating processes, its current density is 0.1 ampere/square decimeter, the temperature of bright nickel solution is 40 DEG C, and pH value is 3.5;
7. adopt the neodymium iron boron thin slice magnet steel product of deionized water to bright nickel plating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of bright nickel plating process is cleaned up post-drying.
In the present embodiment, step 1. middle pre-treating technology comprises the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, the pickle solution of remained on surface is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 250 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 30 grams per liters, the mass body volume concentrations of sodium carbonate is 20 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 20 grams per liters, and in electrolytic process, current density is 0.2 ampere/square decimeter, and electrolyte temperature is 30 DEG C;
1.-4 washings: adopt deionized water repeatedly to clean, by clean for the bath cleans of remained on surface the neodymium iron boron thin slice magnet steel product after electrolysis.
Adopt the method for the present embodiment to process the neodymium iron boron thin slice magnet steel product that thickness is 0.900 ± 0.010 millimeter, end area is 2.88 square centimeters, girth is 7.95 centimetres, profile tolerance is 0.28, chamfering value is 0.25, thin slice magnet steel product concrete structure as shown in Figure 1.By above-mentioned neodymium iron boron thin slice magnet steel production sharing A group, B group and C group three groups, adopt the method for the present embodiment to carry out electronickelling process respectively, correspondingly obtain the product after the three groups of electronickellings of A group, B group and C group.Detect the coating distributing homogeneity of the product after the three groups of electronickellings of A group, B group and C group, wherein coating distributing homogeneity is the ratio of product point and product center portion thickness of coating, and ratio is less, and coating distributing homogeneity is better.A group, B group and C group three set product coating distributing homogeneity: B point (the i.e. product point) thickness of coating of neodymium iron boron thin slice magnet steel product and the ratio of A point (i.e. product center portion) thickness of coating as shown in table 1 below.
Table 1
Test group time Coating distributing homogeneity
A group 1.65
B group 1.70
C group 1.69
Average 1.68
Analytical table 1 data are known, adopt the coating distributing homogeneity of the neodymium iron boron thin slice magnet steel product of the method process of the present embodiment excellent.
Embodiment two: a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product, comprises the following steps:
1. pre-treatment is carried out to neodymium iron boron thin slice magnet steel product;
2. nickel preplating process is carried out to neodymium iron boron thin slice magnet steel product: pre-nickel plating solution is by single nickel salt, boric acid, sodium isethionate, hydroxypropyl Sulfothiorine and water composition, the mass body volume concentrations of single nickel salt is 300 grams per liters, the mass body volume concentrations of boric acid is 50 grams per liters, the mass body volume concentrations of sodium isethionate is 25 mg/litre, the mass body volume concentrations of hydroxypropyl Sulfothiorine is 8 mg/litre, the nickel preplating treatment time is 6500 seconds, dual-pulse power supply is adopted in nickel preplating treating processes, its forward current density is 0.8 ampere/square decimeter, reverse current density is 0.3 ampere/square decimeter, the forward conduction time is 20 seconds, the reverse-conducting time is 10 seconds, positive frequencies is 1.5kHz, reverse frequency is 0.5kHz, forward dutycycle is 70%, reverse dutycycle is 30%, the temperature of pre-nickel plating solution is 60 DEG C, pH value is 4.8,
3. adopt the neodymium iron boron thin slice magnet steel product of deionized water to nickel preplating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of nickel preplating process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
4. the process of plating half light nickel is carried out to neodymium iron boron thin slice magnet steel product: half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water composition, the mass body volume concentrations of single nickel salt is 200 grams per liters, the mass body volume concentrations of nickelous chloride is 40 grams per liters, the mass body volume concentrations of boric acid is 40 grams per liters, Seignette salt mass body volume concentrations is 70 grams per liters, trolamine mass body volume concentrations is 60 grams per liters, ammonium sulfate mass body volume concentrations is 50 grams per liters, ammoniacal liquor concentration of volume percent is 60 milliliters/liter, plating for half light nickel treatment time is 5500 seconds, plate in half light nickel treating processes and adopt high-frequency direct-current power supply, its current density is 0.8 ampere/square decimeter, temperature is 60 DEG C, pH value is 6.5,
5. adopt the neodymium iron boron thin slice magnet steel product of deionized water to the process of plating half light nickel repeatedly to clean, the neodymium iron boron thin slice magnet steel product of plating half light nickel process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
6. bright nickel plating process is carried out to neodymium iron boron thin slice magnet steel product: bright nickel solution is made up of single nickel salt, nickelous chloride, boric acid, soluble saccharin and water, the mass body volume concentrations of single nickel salt is 300 grams per liters, the mass body volume concentrations of nickelous chloride is 60 grams per liters, the mass body volume concentrations of boric acid is 60 grams per liters, the mass body volume concentrations of soluble saccharin is 20 mg/litre, the bright nickel plating treatment time is 4000 seconds, high-frequency direct-current power supply is adopted in bright nickel plating treating processes, its current density is 0.8 ampere/square decimeter, the temperature of bright nickel solution is 60 DEG C, and pH value is 4.8;
7. adopt the neodymium iron boron thin slice magnet steel product of deionized water to bright nickel plating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of bright nickel plating process is cleaned up post-drying.
In the present embodiment, step 1. middle pre-treating technology comprises the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, the pickle solution of remained on surface is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 400 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 60 grams per liters, the mass body volume concentrations of sodium carbonate is 40 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 40 grams per liters, and in electrolytic process, current density is 0.8 ampere/square decimeter, and electrolyte temperature is 60 DEG C;
1.-4 washings: the neodymium iron boron thin slice magnet steel product after electrolysis is repeatedly cleaned, by clean for the bath cleans of remained on surface with deionized water.
Adopt the method for the present embodiment to process the neodymium iron boron thin slice magnet steel product that thickness is 0.900 ± 0.010 millimeter, end area is 2.88 square centimeters, girth is 7.95 centimetres, profile tolerance is 0.28, chamfering value is 0.25, thin slice magnet steel product concrete structure as shown in Figure 1.By above-mentioned neodymium iron boron thin slice magnet steel production sharing A group, B group and C group three groups, adopt the method for the present embodiment to carry out electronickelling process respectively, correspondingly obtain the product after the three groups of electronickellings of A group, B group and C group.Detect the coating distributing homogeneity of the product after the three groups of electronickellings of A group, B group and C group, wherein coating distributing homogeneity is the ratio of product point and product center portion thickness of coating, and ratio is less, and coating distributing homogeneity is better.A group, B group and C group three set product coating distributing homogeneity: B point (the i.e. product point) thickness of coating of neodymium iron boron thin slice magnet steel product and the ratio of A point (i.e. product center portion) thickness of coating as shown in table 2 below.
Table 2
Test group time Coating distributing homogeneity
A group 1.92
B group 1.99
C group 2.01
Average 1.97
Analytical table 2 data are known, adopt the coating distributing homogeneity of the neodymium iron boron thin slice magnet steel product of the method process of the present embodiment excellent.
Embodiment three: a kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product, comprises the following steps:
1. pre-treatment is carried out to neodymium iron boron thin slice magnet steel product;
2. nickel preplating process is carried out to neodymium iron boron thin slice magnet steel product: pre-nickel plating solution is by single nickel salt, boric acid, sodium isethionate, hydroxypropyl Sulfothiorine and water composition, the mass body volume concentrations of single nickel salt is 250 grams per liters, the mass body volume concentrations of boric acid is 40 grams per liters, the mass body volume concentrations of sodium isethionate is 20 mg/litre, the mass body volume concentrations of hydroxypropyl Sulfothiorine is 5 mg/litre, the nickel preplating treatment time is 5000 seconds, dual-pulse power supply is adopted in nickel preplating treating processes, its forward current density is 0.6 ampere/square decimeter, reverse current density is 0.2 ampere/square decimeter, the forward conduction time is 15 seconds, the reverse-conducting time is 8 seconds, positive frequencies is 1.2kHz, reverse frequency is 0.3kHz, forward dutycycle is 60%, reverse dutycycle is 20%, the temperature of pre-nickel plating solution is 50 DEG C, pH value is 4,
3. adopt the neodymium iron boron thin slice magnet steel product of deionized water to nickel preplating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of nickel preplating process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
4. the process of plating half light nickel is carried out to neodymium iron boron thin slice magnet steel product: half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water composition, the mass body volume concentrations of single nickel salt is 150 grams per liters, the mass body volume concentrations of nickelous chloride is 30 grams per liters, the mass body volume concentrations of boric acid is 30 grams per liters, Seignette salt mass body volume concentrations is 55 grams per liters, trolamine mass body volume concentrations is 40 grams per liters, ammonium sulfate mass body volume concentrations is 30 grams per liters, ammoniacal liquor concentration of volume percent is 40 milliliters/liter, plating for half light nickel treatment time is 4500 seconds, plate in half light nickel treating processes and adopt high-frequency direct-current power supply, its current density is 0.5 ampere/square decimeter, temperature is 50 DEG C, pH value is 5.5,
5. adopt the neodymium iron boron thin slice magnet steel product of deionized water to the process of plating half light nickel repeatedly to clean, the neodymium iron boron thin slice magnet steel product of plating half light nickel process is cleaned up; Wash number is selected according to the electroplating technology of existing routine, is cleaned up by the plating solution of remained on surface;
6. bright nickel plating process is carried out to neodymium iron boron thin slice magnet steel product: bright nickel solution is made up of single nickel salt, nickelous chloride, boric acid, soluble saccharin and water, the mass body volume concentrations of single nickel salt is 150 grams per liters, the mass body volume concentrations of nickelous chloride is 50 grams per liters, the mass body volume concentrations of boric acid is 45 grams per liters, the mass body volume concentrations of soluble saccharin is 15 mg/litre, the bright nickel plating treatment time is 3000 seconds, high-frequency direct-current power supply is adopted in bright nickel plating treating processes, its current density is 0.5 ampere/square decimeter, the temperature of bright nickel solution is 50 DEG C, and pH value is 4;
7. adopt the neodymium iron boron thin slice magnet steel product of deionized water to bright nickel plating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of bright nickel plating process is cleaned up post-drying.
In the present embodiment, step 1. middle pre-treating technology comprises the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, the pickle solution of remained on surface is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 300 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 45 grams per liters, the mass body volume concentrations of sodium carbonate is 30 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 30 grams per liters, and in electrolytic process, current density is 0.6 ampere/square decimeter, and electrolyte temperature is 40 DEG C;
1.-4 washings: adopt deionized water repeatedly to clean, by clean for the bath cleans of remained on surface the neodymium iron boron thin slice magnet steel product after electrolysis.
Adopt the method for the present embodiment to process the neodymium iron boron thin slice magnet steel product that thickness is 0.900 ± 0.010 millimeter, end area is 2.88 square centimeters, girth is 7.95 centimetres, profile tolerance is 0.28, chamfering value is 0.25, thin slice magnet steel product concrete structure as shown in Figure 1.By above-mentioned neodymium iron boron thin slice magnet steel production sharing A group, B group and C group three groups, adopt the method for the present embodiment to carry out electronickelling process respectively, correspondingly obtain the product after the three groups of electronickellings of A group, B group and C group.Detect the coating distributing homogeneity of the product after the three groups of electronickellings of A group, B group and C group, wherein coating distributing homogeneity is the ratio of product point and product center portion thickness of coating, and ratio is less, and coating distributing homogeneity is better.A group, B group and C group three set product coating distributing homogeneity: B point (the i.e. product point) thickness of coating of neodymium iron boron thin slice magnet steel product and the ratio of A point (i.e. product center portion) thickness of coating as shown in table 3 below.
Table 3
Test group time Coating distributing homogeneity
A group 2.11
B group 2.09
C group 2.07
Average 2.09
Analytical table 2 data are known, adopt the coating distributing homogeneity of the neodymium iron boron thin slice magnet steel product of the method process of the present embodiment excellent.

Claims (2)

1. a method for electroplating nickel for neodymium iron boron thin slice magnet steel product, is characterized in that comprising the following steps:
1. pre-treatment is carried out to neodymium iron boron thin slice magnet steel product;
2. nickel preplating process is carried out to neodymium iron boron thin slice magnet steel product: pre-nickel plating solution is by single nickel salt, boric acid, sodium isethionate, hydroxypropyl Sulfothiorine and water composition, the mass body volume concentrations of single nickel salt is 220 ~ 300 grams per liters, the mass body volume concentrations of boric acid is 30 ~ 50 grams per liters, the mass body volume concentrations of sodium isethionate is 10 ~ 25 mg/litre, the mass body volume concentrations of hydroxypropyl Sulfothiorine is 2 ~ 8 mg/litre, the nickel preplating treatment time is 3500 ~ 6500 seconds, dual-pulse power supply is adopted in nickel preplating treating processes, its forward current density is 0.2 ~ 0.8 ampere/square decimeter, reverse current density is 0.1 ~ 0.3 ampere/square decimeter, the forward conduction time is 10 ~ 20 seconds, the reverse-conducting time is 5 ~ 10 seconds, positive frequencies is 1 ~ 1.5kHz, reverse frequency is 0.1 ~ 0.5kHz, forward dutycycle is 50% ~ 70%, reverse dutycycle is 10% ~ 30%, the temperature of pre-nickel plating solution is 40 ~ 60 DEG C, pH value is 3.5 ~ 4.8,
3. adopt the neodymium iron boron thin slice magnet steel product of deionized water to nickel preplating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of nickel preplating process is cleaned up;
4. the process of plating half light nickel is carried out to neodymium iron boron thin slice magnet steel product: half light nickel solution is by single nickel salt, nickelous chloride, boric acid, Seignette salt, trolamine, ammonium sulfate, ammoniacal liquor and water composition, the mass body volume concentrations of single nickel salt is 100 ~ 200 grams per liters, the mass body volume concentrations of nickelous chloride is 20 ~ 40 grams per liters, the mass body volume concentrations of boric acid is 20 ~ 40 grams per liters, Seignette salt mass body volume concentrations is 40 ~ 70 grams per liters, trolamine mass body volume concentrations is 20 ~ 60 grams per liters, ammonium sulfate mass body volume concentrations is 10 ~ 50 grams per liters, ammoniacal liquor concentration of volume percent is 20 ~ 60 milliliters/liter, plating for half light nickel treatment time is 3500 ~ 5500 seconds, plate in half light nickel treating processes and adopt high-frequency direct-current power supply, its current density is 0.2 ~ 0.8 ampere/square decimeter, temperature is 40 ~ 60 DEG C, pH value is 4.8 ~ 6.5,
5. adopt the neodymium iron boron thin slice magnet steel product of deionized water to the process of plating half light nickel repeatedly to clean, the neodymium iron boron thin slice magnet steel product of plating half light nickel process is cleaned up;
6. bright nickel plating process is carried out to neodymium iron boron thin slice magnet steel product: bright nickel solution is by single nickel salt, nickelous chloride, boric acid, soluble saccharin and water composition, the mass body volume concentrations of single nickel salt is 200 ~ 300 grams per liters, the mass body volume concentrations of nickelous chloride is 30 ~ 60 grams per liters, the mass body volume concentrations of boric acid is 30 ~ 60 grams per liters, the mass body volume concentrations of soluble saccharin is 5 ~ 20 mg/litre, the bright nickel plating treatment time is 2500 ~ 4000 seconds, high-frequency direct-current power supply is adopted in bright nickel plating treating processes, its current density is 0.1 ~ 0.8 ampere/square decimeter, the temperature of bright nickel solution is 40 ~ 60 DEG C, pH value is 3.5 ~ 4.8,
7. adopt the neodymium iron boron thin slice magnet steel product of deionized water to bright nickel plating process repeatedly to clean, the neodymium iron boron thin slice magnet steel product of bright nickel plating process is cleaned up post-drying.
2. the method for electroplating nickel of a kind of neodymium iron boron thin slice magnet steel product according to claim 1, it is characterized in that described step 1. in pre-treating technology comprise the following steps:
1.-1 pickling: adopt dilute nitric acid solution to carry out pickling as pickle solution to neodymium iron boron thin slice magnet steel product;
1.-2 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after pickling, neodymium iron boron thin slice magnet steel product is cleaned up;
1.-3 the neodymium iron boron thin slice magnet steel product after washing is put into electrolyzer and carried out electrolysis treatment, electrolytic processing time is 250 ~ 400 seconds, electrolytic solution is made up of sodium hydroxide, sodium carbonate, tripoly phosphate sodium STPP and water, the mass body volume concentrations of sodium hydroxide is 30 ~ 60 grams per liters, the mass body volume concentrations of sodium carbonate is 20 ~ 40 grams per liters, the mass body volume concentrations of tripoly phosphate sodium STPP is 20 ~ 40 grams per liters, in electrolytic process, current density is 0.2 ~ 0.8 ampere/square decimeter, and electrolyte temperature is 30 ~ 60 DEG C;
1.-4 washings: adopt deionized water repeatedly to clean the neodymium iron boron thin slice magnet steel product after electrolysis, neodymium iron boron thin slice magnet steel product is cleaned up.
CN201510671499.3A 2015-10-16 2015-10-16 A kind of method for electroplating nickel of neodymium iron boron thin slice magnet steel product CN105220194A (en)

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CN110592623A (en) * 2019-09-05 2019-12-20 宁波韵升股份有限公司 Formula and method of nickel electroplating solution for improving uniform distribution of neodymium iron boron magnet coating
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