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

A technology of permanent magnet material and tin-nickel alloy is applied in the field of tin-nickel alloy plating solution, and the tin-nickel alloy plating solution is used for electroplating tin-nickel alloy on neodymium iron boron permanent magnet material, which can solve the problems of complicated process and reduce the operation process. , The effect of saving nickel metal and reducing thickness

Active Publication Date: 2011-07-06
BEIJING ZHONG KE SAN HUAN HI TECH +1
7 Cites 14 Cited by

AI-Extracted Technical Summary

Problems solved by technology

Because this method needs to electroplate neutral nickel first...
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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.

Technology Topic

CorrosionNeodymium iron boron +8

Examples

  • Experimental program(3)
  • Comparison scheme(1)
  • Effect test(1)

Example Embodiment

[0032] Example 1
[0033] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: 20 grams/liter of stannous chloride, 20 grams/liter of nickel chloride hexahydrate, 180 grams/liter of potassium pyrophosphate, 4ml/L of ammonia, 15 grams/liter of aminoacetic acid, 2 grams of complexing agent ethylene diamine /Rise,. When electroplating, the temperature of the tin-nickel alloy plating solution is 45℃, the pH is 7.5, and the current density is 0.5A/dm 2 , The plating time is 200min. After electroplating, the thickness of the tin-nickel alloy plating layer is 18 microns. Clean the tin-nickel alloy coating with deionized water for three times, then pass the NdFeB permanent magnet material through the sealing agent to seal the hole. After the hole is sealed, use a hair dryer to dry the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.

Example Embodiment

[0034] Example 2
[0035] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: stannous chloride 30g/l, nickel chloride hexahydrate 30g/l, potassium pyrophosphate 200g/l, ammonia water 6ml/L, aminoacetic acid 20g/l, complexing agent ethylenediamine 4g/l Rise. When electroplating, the temperature of the tin-nickel alloy plating solution is 50℃, the pH is 8.0, and the current density is 1A/dm 2 , The plating time is 100min. After electroplating, the thickness of the tin-nickel alloy coating is 15 microns. Clean the tin-nickel alloy coating three times with deionized water, and then pass the NdFeB permanent magnet material through the sealing liquid to seal the hole. After the hole is sealed, use a hair dryer to dry the moisture on the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.

Example Embodiment

[0036] Example 3
[0037] 3 kg D15*4 sintered NdFeB permanent magnet material was polished in a vibrating mill for 3 hours. Use 10L degreasing agent, its composition is sodium phosphate 30g/liter, sodium carbonate 8g/liter and sodium hydroxide 8g/liter. After degreasing and degreasing the neodymium iron boron permanent magnet material, it is removed by pickling with 5% nitric acid solution The oxide on the surface of the neodymium iron boron permanent magnet material is then washed 3 times with water. Then use 5% sulfuric acid solution to activate the neodymium iron boron permanent magnet material, then electroplating, put the pretreated neodymium iron boron permanent magnet material into the tin-nickel alloy plating solution, the composition of the tin-nickel alloy plating solution It is: stannous chloride 40 g/l, nickel chloride hexahydrate 40 g/l, potassium pyrophosphate 220 g/l, ammonia water 8ml/L, glycine 25 g/l, complexing agent ethylene diamine 6 g/l When electroplating, the temperature of the tin-nickel alloy plating solution is 55℃, the pH is 8.5, and the current density is 1.5A/dm 2 , The electroplating time is 60min. After electroplating, the thickness of the tin-nickel alloy coating is 12 microns. Clean the tin-nickel alloy coating three times with deionized water, and then pass the NdFeB permanent magnet material through the sealing liquid to seal the hole. After the hole is sealed, use a hair dryer to dry the moisture on the surface of the NdFeB permanent magnet material, and finally in an oven at 100℃ Dry for 20 minutes. Among them, the sealing agent used is NF1080 water-based nickel plating sealing agent produced by Guangzhou Tianzhi Environmental Protection Technology Co., Ltd.

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